Made Actor, Activity and Case entities

modules/opencase_entities/config/schema/oc_activity_type.schema.yml

@@ -0,0 +1,12 @@
+opencase_entities.oc_activity_type.*:
+  type: config_entity
+  label: 'Activity type config'
+  mapping:
+    id:
+      type: string
+      label: 'ID'
+    label:
+      type: label
+      label: 'Label'
+    uuid:
+      type: string

modules/opencase_entities/config/schema/oc_actor_type.schema.yml

@@ -0,0 +1,12 @@
+opencase_entities.oc_actor_type.*:
+  type: config_entity
+  label: 'Actor type config'
+  mapping:
+    id:
+      type: string
+      label: 'ID'
+    label:
+      type: label
+      label: 'Label'
+    uuid:
+      type: string

modules/opencase_entities/config/schema/oc_case_type.schema.yml

@@ -0,0 +1,12 @@
+opencase_entities.oc_case_type.*:
+  type: config_entity
+  label: 'Case type config'
+  mapping:
+    id:
+      type: string
+      label: 'ID'
+    label:
+      type: label
+      label: 'Label'
+    uuid:
+      type: string

modules/opencase_entities/oc_activity.page.inc

@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * @file
+ * Contains oc_activity.page.inc.
+ *
+ * Page callback for Activity entities.
+ */
+
+use Drupal\Core\Render\Element;
+
+/**
+ * Prepares variables for Activity templates.
+ *
+ * Default template: oc_activity.html.twig.
+ *
+ * @param array $variables
+ *   An associative array containing:
+ *   - elements: An associative array containing the user information and any
+ *   - attributes: HTML attributes for the containing element.
+ */
+function template_preprocess_oc_activity(array &$variables) {
+  // Fetch OCActivity Entity Object.
+  $oc_activity = $variables['elements']['#oc_activity'];
+
+  // Helpful $content variable for templates.
+  foreach (Element::children($variables['elements']) as $key) {
+    $variables['content'][$key] = $variables['elements'][$key];
+  }
+}

modules/opencase_entities/oc_actor.page.inc

@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * @file
+ * Contains oc_actor.page.inc.
+ *
+ * Page callback for Actor entities.
+ */
+
+use Drupal\Core\Render\Element;
+
+/**
+ * Prepares variables for Actor templates.
+ *
+ * Default template: oc_actor.html.twig.
+ *
+ * @param array $variables
+ *   An associative array containing:
+ *   - elements: An associative array containing the user information and any
+ *   - attributes: HTML attributes for the containing element.
+ */
+function template_preprocess_oc_actor(array &$variables) {
+  // Fetch OCActor Entity Object.
+  $oc_actor = $variables['elements']['#oc_actor'];
+
+  // Helpful $content variable for templates.
+  foreach (Element::children($variables['elements']) as $key) {
+    $variables['content'][$key] = $variables['elements'][$key];
+  }
+}

modules/opencase_entities/oc_case.page.inc

@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * @file
+ * Contains oc_case.page.inc.
+ *
+ * Page callback for Case entities.
+ */
+
+use Drupal\Core\Render\Element;
+
+/**
+ * Prepares variables for Case templates.
+ *
+ * Default template: oc_case.html.twig.
+ *
+ * @param array $variables
+ *   An associative array containing:
+ *   - elements: An associative array containing the user information and any
+ *   - attributes: HTML attributes for the containing element.
+ */
+function template_preprocess_oc_case(array &$variables) {
+  // Fetch OCCase Entity Object.
+  $oc_case = $variables['elements']['#oc_case'];
+
+  // Helpful $content variable for templates.
+  foreach (Element::children($variables['elements']) as $key) {
+    $variables['content'][$key] = $variables['elements'][$key];
+  }
+}

modules/opencase_entities/opencase_entities.links.action.yml

@@ -0,0 +1,33 @@
+entity.oc_actor.add_form:
+  route_name: entity.oc_actor.add_page
+  title: 'Add Actor'
+  appears_on:
+    - entity.oc_actor.collection
+entity.oc_actor_type.add_form:
+  route_name: entity.oc_actor_type.add_form
+  title: 'Add Actor type'
+  appears_on:
+    - entity.oc_actor_type.collection
+
+entity.oc_case.add_form:
+  route_name: entity.oc_case.add_page
+  title: 'Add Case'
+  appears_on:
+    - entity.oc_case.collection
+entity.oc_case_type.add_form:
+  route_name: entity.oc_case_type.add_form
+  title: 'Add Case type'
+  appears_on:
+    - entity.oc_case_type.collection
+
+entity.oc_activity.add_form:
+  route_name: entity.oc_activity.add_page
+  title: 'Add Activity'
+  appears_on:
+    - entity.oc_activity.collection
+entity.oc_activity_type.add_form:
+  route_name: entity.oc_activity_type.add_form
+  title: 'Add Activity type'
+  appears_on:
+    - entity.oc_activity_type.collection
+

modules/opencase_entities/opencase_entities.links.menu.yml

@@ -0,0 +1,54 @@
+
+# Actor menu items definition
+entity.oc_actor.collection:
+  title: 'Actor list'
+  route_name: entity.oc_actor.collection
+  description: 'List Actor entities'
+  parent: system.admin_structure
+  weight: 100
+
+
+# Actor type menu items definition
+entity.oc_actor_type.collection:
+  title: 'Actor type'
+  route_name: entity.oc_actor_type.collection
+  description: 'List Actor type (bundles)'
+  parent: system.admin_structure
+  weight: 99
+
+
+# Case menu items definition
+entity.oc_case.collection:
+  title: 'Case list'
+  route_name: entity.oc_case.collection
+  description: 'List Case entities'
+  parent: system.admin_structure
+  weight: 100
+
+
+# Case type menu items definition
+entity.oc_case_type.collection:
+  title: 'Case type'
+  route_name: entity.oc_case_type.collection
+  description: 'List Case type (bundles)'
+  parent: system.admin_structure
+  weight: 99
+
+
+# Activity menu items definition
+entity.oc_activity.collection:
+  title: 'Activity list'
+  route_name: entity.oc_activity.collection
+  description: 'List Activity entities'
+  parent: system.admin_structure
+  weight: 100
+
+
+# Activity type menu items definition
+entity.oc_activity_type.collection:
+  title: 'Activity type'
+  route_name: entity.oc_activity_type.collection
+  description: 'List Activity type (bundles)'
+  parent: system.admin_structure
+  weight: 99
+

modules/opencase_entities/opencase_entities.links.task.yml

@@ -0,0 +1,69 @@
+# Actor routing definition
+
+entity.oc_actor.canonical:
+  route_name: entity.oc_actor.canonical
+  base_route: entity.oc_actor.canonical
+  title: 'View'
+
+entity.oc_actor.edit_form:
+  route_name: entity.oc_actor.edit_form
+  base_route: entity.oc_actor.canonical
+  title: 'Edit'
+
+entity.oc_actor.version_history:
+  route_name: entity.oc_actor.version_history
+  base_route: entity.oc_actor.canonical
+  title: 'Revisions'
+
+entity.oc_actor.delete_form:
+  route_name:  entity.oc_actor.delete_form
+  base_route:  entity.oc_actor.canonical
+  title: Delete
+  weight: 10
+
+# Case routing definition
+
+entity.oc_case.canonical:
+  route_name: entity.oc_case.canonical
+  base_route: entity.oc_case.canonical
+  title: 'View'
+
+entity.oc_case.edit_form:
+  route_name: entity.oc_case.edit_form
+  base_route: entity.oc_case.canonical
+  title: 'Edit'
+
+entity.oc_case.version_history:
+  route_name: entity.oc_case.version_history
+  base_route: entity.oc_case.canonical
+  title: 'Revisions'
+
+entity.oc_case.delete_form:
+  route_name:  entity.oc_case.delete_form
+  base_route:  entity.oc_case.canonical
+  title: Delete
+  weight: 10
+
+# Activity routing definition
+
+entity.oc_activity.canonical:
+  route_name: entity.oc_activity.canonical
+  base_route: entity.oc_activity.canonical
+  title: 'View'
+
+entity.oc_activity.edit_form:
+  route_name: entity.oc_activity.edit_form
+  base_route: entity.oc_activity.canonical
+  title: 'Edit'
+
+entity.oc_activity.version_history:
+  route_name: entity.oc_activity.version_history
+  base_route: entity.oc_activity.canonical
+  title: 'Revisions'
+
+entity.oc_activity.delete_form:
+  route_name:  entity.oc_activity.delete_form
+  base_route:  entity.oc_activity.canonical
+  title: Delete
+  weight: 10
+

modules/opencase_entities/opencase_entities.module

@@ -27,9 +27,87 @@ function opencase_entities_help($route_name, RouteMatchInterface $route_match) {
  * Implements hook_theme().
  */
 function opencase_entities_theme() {
-  return [
-    'opencase_entities' => [
+  $theme = [];
+  $theme['opencase_entities'] = [
     'render element' => 'children',
-    ],
   ];
+  $theme['oc_actor'] = [
+    'render element' => 'elements',
+    'file' => 'oc_actor.page.inc',
+    'template' => 'oc_actor',
+  ];
+  $theme['oc_actor_content_add_list'] = [
+    'render element' => 'content',
+    'variables' => ['content' => NULL],
+    'file' => 'oc_actor.page.inc',
+  ];
+  $theme['oc_case'] = [
+    'render element' => 'elements',
+    'file' => 'oc_case.page.inc',
+    'template' => 'oc_case',
+  ];
+  $theme['oc_case_content_add_list'] = [
+    'render element' => 'content',
+    'variables' => ['content' => NULL],
+    'file' => 'oc_case.page.inc',
+  ];
+  $theme['oc_activity'] = [
+    'render element' => 'elements',
+    'file' => 'oc_activity.page.inc',
+    'template' => 'oc_activity',
+  ];
+  $theme['oc_activity_content_add_list'] = [
+    'render element' => 'content',
+    'variables' => ['content' => NULL],
+    'file' => 'oc_activity.page.inc',
+  ];
+  return $theme;
+}
+
+/**
+* Implements hook_theme_suggestions_HOOK().
+*/
+function opencase_entities_theme_suggestions_oc_actor(array $variables) {
+  $suggestions = [];
+  $entity = $variables['elements']['#oc_actor'];
+  $sanitized_view_mode = strtr($variables['elements']['#view_mode'], '.', '_');
+
+  $suggestions[] = 'oc_actor__' . $sanitized_view_mode;
+  $suggestions[] = 'oc_actor__' . $entity->bundle();
+  $suggestions[] = 'oc_actor__' . $entity->bundle() . '__' . $sanitized_view_mode;
+  $suggestions[] = 'oc_actor__' . $entity->id();
+  $suggestions[] = 'oc_actor__' . $entity->id() . '__' . $sanitized_view_mode;
+  return $suggestions;
+}
+
+/**
+* Implements hook_theme_suggestions_HOOK().
+*/
+function opencase_entities_theme_suggestions_oc_case(array $variables) {
+  $suggestions = [];
+  $entity = $variables['elements']['#oc_case'];
+  $sanitized_view_mode = strtr($variables['elements']['#view_mode'], '.', '_');
+
+  $suggestions[] = 'oc_case__' . $sanitized_view_mode;
+  $suggestions[] = 'oc_case__' . $entity->bundle();
+  $suggestions[] = 'oc_case__' . $entity->bundle() . '__' . $sanitized_view_mode;
+  $suggestions[] = 'oc_case__' . $entity->id();
+  $suggestions[] = 'oc_case__' . $entity->id() . '__' . $sanitized_view_mode;
+  return $suggestions;
+}
+
+/**
+* Implements hook_theme_suggestions_HOOK().
+*/
+function opencase_entities_theme_suggestions_oc_activity(array $variables) {
+  $suggestions = [];
+  $entity = $variables['elements']['#oc_activity'];
+  $sanitized_view_mode = strtr($variables['elements']['#view_mode'], '.', '_');
+
+  $suggestions[] = 'oc_activity__' . $sanitized_view_mode;
+  $suggestions[] = 'oc_activity__' . $entity->bundle();
+  $suggestions[] = 'oc_activity__' . $entity->bundle() . '__' . $sanitized_view_mode;
+  $suggestions[] = 'oc_activity__' . $entity->id();
+  $suggestions[] = 'oc_activity__' . $entity->id() . '__' . $sanitized_view_mode;
+  return $suggestions;
 }

modules/opencase_entities/opencase_entities.permissions.yml

@@ -0,0 +1,90 @@
+add actor entities:
+  title: 'Create new Actor entities'
+
+administer actor entities:
+  title: 'Administer Actor entities'
+  description: 'Allow to access the administration form to configure Actor entities.'
+  restrict access: true
+
+delete actor entities:
+  title: 'Delete Actor entities'
+
+edit actor entities:
+  title: 'Edit Actor entities'
+
+view published actor entities:
+  title: 'View published Actor entities'
+
+view unpublished actor entities:
+  title: 'View unpublished Actor entities'
+
+view all actor revisions:
+  title: 'View all Actor revisions'
+
+revert all actor revisions:
+  title: 'Revert all Actor revisions'
+  description: 'Role requires permission <em>view Actor revisions</em> and <em>edit rights</em> for actor entities in question or <em>administer actor entities</em>.'
+
+delete all actor revisions:
+  title: 'Delete all revisions'
+  description: 'Role requires permission to <em>view Actor revisions</em> and <em>delete rights</em> for actor entities in question or <em>administer actor entities</em>.'
+add case entities:
+  title: 'Create new Case entities'
+
+administer case entities:
+  title: 'Administer Case entities'
+  description: 'Allow to access the administration form to configure Case entities.'
+  restrict access: true
+
+delete case entities:
+  title: 'Delete Case entities'
+
+edit case entities:
+  title: 'Edit Case entities'
+
+view published case entities:
+  title: 'View published Case entities'
+
+view unpublished case entities:
+  title: 'View unpublished Case entities'
+
+view all case revisions:
+  title: 'View all Case revisions'
+
+revert all case revisions:
+  title: 'Revert all Case revisions'
+  description: 'Role requires permission <em>view Case revisions</em> and <em>edit rights</em> for case entities in question or <em>administer case entities</em>.'
+
+delete all case revisions:
+  title: 'Delete all revisions'
+  description: 'Role requires permission to <em>view Case revisions</em> and <em>delete rights</em> for case entities in question or <em>administer case entities</em>.'
+add activity entities:
+  title: 'Create new Activity entities'
+
+administer activity entities:
+  title: 'Administer Activity entities'
+  description: 'Allow to access the administration form to configure Activity entities.'
+  restrict access: true
+
+delete activity entities:
+  title: 'Delete Activity entities'
+
+edit activity entities:
+  title: 'Edit Activity entities'
+
+view published activity entities:
+  title: 'View published Activity entities'
+
+view unpublished activity entities:
+  title: 'View unpublished Activity entities'
+
+view all activity revisions:
+  title: 'View all Activity revisions'
+
+revert all activity revisions:
+  title: 'Revert all Activity revisions'
+  description: 'Role requires permission <em>view Activity revisions</em> and <em>edit rights</em> for activity entities in question or <em>administer activity entities</em>.'
+
+delete all activity revisions:
+  title: 'Delete all revisions'
+  description: 'Role requires permission to <em>view Activity revisions</em> and <em>delete rights</em> for activity entities in question or <em>administer activity entities</em>.'

modules/opencase_entities/src/Controller/OCActivityController.php

@@ -0,0 +1,163 @@
+<?php
+
+namespace Drupal\opencase_entities\Controller;
+
+use Drupal\Component\Utility\Xss;
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Url;
+use Drupal\opencase_entities\Entity\OCActivityInterface;
+
+/**
+ * Class OCActivityController.
+ *
+ *  Returns responses for Activity routes.
+ */
+class OCActivityController extends ControllerBase implements ContainerInjectionInterface {
+
+  /**
+   * Displays a Activity  revision.
+   *
+   * @param int $oc_activity_revision
+   *   The Activity  revision ID.
+   *
+   * @return array
+   *   An array suitable for drupal_render().
+   */
+  public function revisionShow($oc_activity_revision) {
+    $oc_activity = $this->entityManager()->getStorage('oc_activity')->loadRevision($oc_activity_revision);
+    $view_builder = $this->entityManager()->getViewBuilder('oc_activity');
+
+    return $view_builder->view($oc_activity);
+  }
+
+  /**
+   * Page title callback for a Activity  revision.
+   *
+   * @param int $oc_activity_revision
+   *   The Activity  revision ID.
+   *
+   * @return string
+   *   The page title.
+   */
+  public function revisionPageTitle($oc_activity_revision) {
+    $oc_activity = $this->entityManager()->getStorage('oc_activity')->loadRevision($oc_activity_revision);
+    return $this->t('Revision of %title from %date', ['%title' => $oc_activity->label(), '%date' => format_date($oc_activity->getRevisionCreationTime())]);
+  }
+
+  /**
+   * Generates an overview table of older revisions of a Activity .
+   *
+   * @param \Drupal\opencase_entities\Entity\OCActivityInterface $oc_activity
+   *   A Activity  object.
+   *
+   * @return array
+   *   An array as expected by drupal_render().
+   */
+  public function revisionOverview(OCActivityInterface $oc_activity) {
+    $account = $this->currentUser();
+    $langcode = $oc_activity->language()->getId();
+    $langname = $oc_activity->language()->getName();
+    $languages = $oc_activity->getTranslationLanguages();
+    $has_translations = (count($languages) > 1);
+    $oc_activity_storage = $this->entityManager()->getStorage('oc_activity');
+
+    $build['#title'] = $has_translations ? $this->t('@langname revisions for %title', ['@langname' => $langname, '%title' => $oc_activity->label()]) : $this->t('Revisions for %title', ['%title' => $oc_activity->label()]);
+    $header = [$this->t('Revision'), $this->t('Operations')];
+
+    $revert_permission = (($account->hasPermission("revert all activity revisions") || $account->hasPermission('administer activity entities')));
+    $delete_permission = (($account->hasPermission("delete all activity revisions") || $account->hasPermission('administer activity entities')));
+
+    $rows = [];
+
+    $vids = $oc_activity_storage->revisionIds($oc_activity);
+
+    $latest_revision = TRUE;
+
+    foreach (array_reverse($vids) as $vid) {
+      /** @var \Drupal\opencase_entities\OCActivityInterface $revision */
+      $revision = $oc_activity_storage->loadRevision($vid);
+      // Only show revisions that are affected by the language that is being
+      // displayed.
+      if ($revision->hasTranslation($langcode) && $revision->getTranslation($langcode)->isRevisionTranslationAffected()) {
+        $username = [
+          '#theme' => 'username',
+          '#account' => $revision->getRevisionUser(),
+        ];
+
+        // Use revision link to link to revisions that are not active.
+        $date = \Drupal::service('date.formatter')->format($revision->getRevisionCreationTime(), 'short');
+        if ($vid != $oc_activity->getRevisionId()) {
+          $link = $this->l($date, new Url('entity.oc_activity.revision', ['oc_activity' => $oc_activity->id(), 'oc_activity_revision' => $vid]));
+        }
+        else {
+          $link = $oc_activity->link($date);
+        }
+
+        $row = [];
+        $column = [
+          'data' => [
+            '#type' => 'inline_template',
+            '#template' => '{% trans %}{{ date }} by {{ username }}{% endtrans %}{% if message %}<p class="revision-log">{{ message }}</p>{% endif %}',
+            '#context' => [
+              'date' => $link,
+              'username' => \Drupal::service('renderer')->renderPlain($username),
+              'message' => ['#markup' => $revision->getRevisionLogMessage(), '#allowed_tags' => Xss::getHtmlTagList()],
+            ],
+          ],
+        ];
+        $row[] = $column;
+
+        if ($latest_revision) {
+          $row[] = [
+            'data' => [
+              '#prefix' => '<em>',
+              '#markup' => $this->t('Current revision'),
+              '#suffix' => '</em>',
+            ],
+          ];
+          foreach ($row as &$current) {
+            $current['class'] = ['revision-current'];
+          }
+          $latest_revision = FALSE;
+        }
+        else {
+          $links = [];
+          if ($revert_permission) {
+            $links['revert'] = [
+              'title' => $this->t('Revert'),
+              'url' => $has_translations ?
+              Url::fromRoute('entity.oc_activity.translation_revert', ['oc_activity' => $oc_activity->id(), 'oc_activity_revision' => $vid, 'langcode' => $langcode]) :
+              Url::fromRoute('entity.oc_activity.revision_revert', ['oc_activity' => $oc_activity->id(), 'oc_activity_revision' => $vid]),
+            ];
+          }
+
+          if ($delete_permission) {
+            $links['delete'] = [
+              'title' => $this->t('Delete'),
+              'url' => Url::fromRoute('entity.oc_activity.revision_delete', ['oc_activity' => $oc_activity->id(), 'oc_activity_revision' => $vid]),
+            ];
+          }
+
+          $row[] = [
+            'data' => [
+              '#type' => 'operations',
+              '#links' => $links,
+            ],
+          ];
+        }
+
+        $rows[] = $row;
+      }
+    }
+
+    $build['oc_activity_revisions_table'] = [
+      '#theme' => 'table',
+      '#rows' => $rows,
+      '#header' => $header,
+    ];
+
+    return $build;
+  }
+
+}

modules/opencase_entities/src/Controller/OCActorController.php

@@ -0,0 +1,163 @@
+<?php
+
+namespace Drupal\opencase_entities\Controller;
+
+use Drupal\Component\Utility\Xss;
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Url;
+use Drupal\opencase_entities\Entity\OCActorInterface;
+
+/**
+ * Class OCActorController.
+ *
+ *  Returns responses for Actor routes.
+ */
+class OCActorController extends ControllerBase implements ContainerInjectionInterface {
+
+  /**
+   * Displays a Actor  revision.
+   *
+   * @param int $oc_actor_revision
+   *   The Actor  revision ID.
+   *
+   * @return array
+   *   An array suitable for drupal_render().
+   */
+  public function revisionShow($oc_actor_revision) {
+    $oc_actor = $this->entityManager()->getStorage('oc_actor')->loadRevision($oc_actor_revision);
+    $view_builder = $this->entityManager()->getViewBuilder('oc_actor');
+
+    return $view_builder->view($oc_actor);
+  }
+
+  /**
+   * Page title callback for a Actor  revision.
+   *
+   * @param int $oc_actor_revision
+   *   The Actor  revision ID.
+   *
+   * @return string
+   *   The page title.
+   */
+  public function revisionPageTitle($oc_actor_revision) {
+    $oc_actor = $this->entityManager()->getStorage('oc_actor')->loadRevision($oc_actor_revision);
+    return $this->t('Revision of %title from %date', ['%title' => $oc_actor->label(), '%date' => format_date($oc_actor->getRevisionCreationTime())]);
+  }
+
+  /**
+   * Generates an overview table of older revisions of a Actor .
+   *
+   * @param \Drupal\opencase_entities\Entity\OCActorInterface $oc_actor
+   *   A Actor  object.
+   *
+   * @return array
+   *   An array as expected by drupal_render().
+   */
+  public function revisionOverview(OCActorInterface $oc_actor) {
+    $account = $this->currentUser();
+    $langcode = $oc_actor->language()->getId();
+    $langname = $oc_actor->language()->getName();
+    $languages = $oc_actor->getTranslationLanguages();
+    $has_translations = (count($languages) > 1);
+    $oc_actor_storage = $this->entityManager()->getStorage('oc_actor');
+
+    $build['#title'] = $has_translations ? $this->t('@langname revisions for %title', ['@langname' => $langname, '%title' => $oc_actor->label()]) : $this->t('Revisions for %title', ['%title' => $oc_actor->label()]);
+    $header = [$this->t('Revision'), $this->t('Operations')];
+
+    $revert_permission = (($account->hasPermission("revert all actor revisions") || $account->hasPermission('administer actor entities')));
+    $delete_permission = (($account->hasPermission("delete all actor revisions") || $account->hasPermission('administer actor entities')));
+
+    $rows = [];
+
+    $vids = $oc_actor_storage->revisionIds($oc_actor);
+
+    $latest_revision = TRUE;
+
+    foreach (array_reverse($vids) as $vid) {
+      /** @var \Drupal\opencase_entities\OCActorInterface $revision */
+      $revision = $oc_actor_storage->loadRevision($vid);
+      // Only show revisions that are affected by the language that is being
+      // displayed.
+      if ($revision->hasTranslation($langcode) && $revision->getTranslation($langcode)->isRevisionTranslationAffected()) {
+        $username = [
+          '#theme' => 'username',
+          '#account' => $revision->getRevisionUser(),
+        ];
+
+        // Use revision link to link to revisions that are not active.
+        $date = \Drupal::service('date.formatter')->format($revision->getRevisionCreationTime(), 'short');
+        if ($vid != $oc_actor->getRevisionId()) {
+          $link = $this->l($date, new Url('entity.oc_actor.revision', ['oc_actor' => $oc_actor->id(), 'oc_actor_revision' => $vid]));
+        }
+        else {
+          $link = $oc_actor->link($date);
+        }
+
+        $row = [];
+        $column = [
+          'data' => [
+            '#type' => 'inline_template',
+            '#template' => '{% trans %}{{ date }} by {{ username }}{% endtrans %}{% if message %}<p class="revision-log">{{ message }}</p>{% endif %}',
+            '#context' => [
+              'date' => $link,
+              'username' => \Drupal::service('renderer')->renderPlain($username),
+              'message' => ['#markup' => $revision->getRevisionLogMessage(), '#allowed_tags' => Xss::getHtmlTagList()],
+            ],
+          ],
+        ];
+        $row[] = $column;
+
+        if ($latest_revision) {
+          $row[] = [
+            'data' => [
+              '#prefix' => '<em>',
+              '#markup' => $this->t('Current revision'),
+              '#suffix' => '</em>',
+            ],
+          ];
+          foreach ($row as &$current) {
+            $current['class'] = ['revision-current'];
+          }
+          $latest_revision = FALSE;
+        }
+        else {
+          $links = [];
+          if ($revert_permission) {
+            $links['revert'] = [
+              'title' => $this->t('Revert'),
+              'url' => $has_translations ?
+              Url::fromRoute('entity.oc_actor.translation_revert', ['oc_actor' => $oc_actor->id(), 'oc_actor_revision' => $vid, 'langcode' => $langcode]) :
+              Url::fromRoute('entity.oc_actor.revision_revert', ['oc_actor' => $oc_actor->id(), 'oc_actor_revision' => $vid]),
+            ];
+          }
+
+          if ($delete_permission) {
+            $links['delete'] = [
+              'title' => $this->t('Delete'),
+              'url' => Url::fromRoute('entity.oc_actor.revision_delete', ['oc_actor' => $oc_actor->id(), 'oc_actor_revision' => $vid]),
+            ];
+          }
+
+          $row[] = [
+            'data' => [
+              '#type' => 'operations',
+              '#links' => $links,
+            ],
+          ];
+        }
+
+        $rows[] = $row;
+      }
+    }
+
+    $build['oc_actor_revisions_table'] = [
+      '#theme' => 'table',
+      '#rows' => $rows,
+      '#header' => $header,
+    ];
+
+    return $build;
+  }
+
+}

modules/opencase_entities/src/Controller/OCCaseController.php

@@ -0,0 +1,163 @@
+<?php
+
+namespace Drupal\opencase_entities\Controller;
+
+use Drupal\Component\Utility\Xss;
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Url;
+use Drupal\opencase_entities\Entity\OCCaseInterface;
+
+/**
+ * Class OCCaseController.
+ *
+ *  Returns responses for Case routes.
+ */
+class OCCaseController extends ControllerBase implements ContainerInjectionInterface {
+
+  /**
+   * Displays a Case  revision.
+   *
+   * @param int $oc_case_revision
+   *   The Case  revision ID.
+   *
+   * @return array
+   *   An array suitable for drupal_render().
+   */
+  public function revisionShow($oc_case_revision) {
+    $oc_case = $this->entityManager()->getStorage('oc_case')->loadRevision($oc_case_revision);
+    $view_builder = $this->entityManager()->getViewBuilder('oc_case');
+
+    return $view_builder->view($oc_case);
+  }
+
+  /**
+   * Page title callback for a Case  revision.
+   *
+   * @param int $oc_case_revision
+   *   The Case  revision ID.
+   *
+   * @return string
+   *   The page title.
+   */
+  public function revisionPageTitle($oc_case_revision) {
+    $oc_case = $this->entityManager()->getStorage('oc_case')->loadRevision($oc_case_revision);
+    return $this->t('Revision of %title from %date', ['%title' => $oc_case->label(), '%date' => format_date($oc_case->getRevisionCreationTime())]);
+  }
+
+  /**
+   * Generates an overview table of older revisions of a Case .
+   *
+   * @param \Drupal\opencase_entities\Entity\OCCaseInterface $oc_case
+   *   A Case  object.
+   *
+   * @return array
+   *   An array as expected by drupal_render().
+   */
+  public function revisionOverview(OCCaseInterface $oc_case) {
+    $account = $this->currentUser();
+    $langcode = $oc_case->language()->getId();
+    $langname = $oc_case->language()->getName();
+    $languages = $oc_case->getTranslationLanguages();
+    $has_translations = (count($languages) > 1);
+    $oc_case_storage = $this->entityManager()->getStorage('oc_case');
+
+    $build['#title'] = $has_translations ? $this->t('@langname revisions for %title', ['@langname' => $langname, '%title' => $oc_case->label()]) : $this->t('Revisions for %title', ['%title' => $oc_case->label()]);
+    $header = [$this->t('Revision'), $this->t('Operations')];
+
+    $revert_permission = (($account->hasPermission("revert all case revisions") || $account->hasPermission('administer case entities')));
+    $delete_permission = (($account->hasPermission("delete all case revisions") || $account->hasPermission('administer case entities')));
+
+    $rows = [];
+
+    $vids = $oc_case_storage->revisionIds($oc_case);
+
+    $latest_revision = TRUE;
+
+    foreach (array_reverse($vids) as $vid) {
+      /** @var \Drupal\opencase_entities\OCCaseInterface $revision */
+      $revision = $oc_case_storage->loadRevision($vid);
+      // Only show revisions that are affected by the language that is being
+      // displayed.
+      if ($revision->hasTranslation($langcode) && $revision->getTranslation($langcode)->isRevisionTranslationAffected()) {
+        $username = [
+          '#theme' => 'username',
+          '#account' => $revision->getRevisionUser(),
+        ];
+
+        // Use revision link to link to revisions that are not active.
+        $date = \Drupal::service('date.formatter')->format($revision->getRevisionCreationTime(), 'short');
+        if ($vid != $oc_case->getRevisionId()) {
+          $link = $this->l($date, new Url('entity.oc_case.revision', ['oc_case' => $oc_case->id(), 'oc_case_revision' => $vid]));
+        }
+        else {
+          $link = $oc_case->link($date);
+        }
+
+        $row = [];
+        $column = [
+          'data' => [
+            '#type' => 'inline_template',
+            '#template' => '{% trans %}{{ date }} by {{ username }}{% endtrans %}{% if message %}<p class="revision-log">{{ message }}</p>{% endif %}',
+            '#context' => [
+              'date' => $link,
+              'username' => \Drupal::service('renderer')->renderPlain($username),
+              'message' => ['#markup' => $revision->getRevisionLogMessage(), '#allowed_tags' => Xss::getHtmlTagList()],
+            ],
+          ],
+        ];
+        $row[] = $column;
+
+        if ($latest_revision) {
+          $row[] = [
+            'data' => [
+              '#prefix' => '<em>',
+              '#markup' => $this->t('Current revision'),
+              '#suffix' => '</em>',
+            ],
+          ];
+          foreach ($row as &$current) {
+            $current['class'] = ['revision-current'];
+          }
+          $latest_revision = FALSE;
+        }
+        else {
+          $links = [];
+          if ($revert_permission) {
+            $links['revert'] = [
+              'title' => $this->t('Revert'),
+              'url' => $has_translations ?
+              Url::fromRoute('entity.oc_case.translation_revert', ['oc_case' => $oc_case->id(), 'oc_case_revision' => $vid, 'langcode' => $langcode]) :
+              Url::fromRoute('entity.oc_case.revision_revert', ['oc_case' => $oc_case->id(), 'oc_case_revision' => $vid]),
+            ];
+          }
+
+          if ($delete_permission) {
+            $links['delete'] = [
+              'title' => $this->t('Delete'),
+              'url' => Url::fromRoute('entity.oc_case.revision_delete', ['oc_case' => $oc_case->id(), 'oc_case_revision' => $vid]),
+            ];
+          }
+
+          $row[] = [
+            'data' => [
+              '#type' => 'operations',
+              '#links' => $links,
+            ],
+          ];
+        }
+
+        $rows[] = $row;
+      }
+    }
+
+    $build['oc_case_revisions_table'] = [
+      '#theme' => 'table',
+      '#rows' => $rows,
+      '#header' => $header,
+    ];
+
+    return $build;
+  }
+
+}

modules/opencase_entities/src/Entity/OCActivity.php

@@ -0,0 +1,281 @@
+<?php
+
+namespace Drupal\opencase_entities\Entity;
+
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Field\BaseFieldDefinition;
+use Drupal\Core\Entity\RevisionableContentEntityBase;
+use Drupal\Core\Entity\RevisionableInterface;
+use Drupal\Core\Entity\EntityChangedTrait;
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\user\UserInterface;
+
+/**
+ * Defines the Activity entity.
+ *
+ * @ingroup opencase_entities
+ *
+ * @ContentEntityType(
+ *   id = "oc_activity",
+ *   label = @Translation("Activity"),
+ *   bundle_label = @Translation("Activity type"),
+ *   handlers = {
+ *     "storage" = "Drupal\opencase_entities\OCActivityStorage",
+ *     "view_builder" = "Drupal\Core\Entity\EntityViewBuilder",
+ *     "list_builder" = "Drupal\opencase_entities\OCActivityListBuilder",
+ *     "views_data" = "Drupal\opencase_entities\Entity\OCActivityViewsData",
+ *     "translation" = "Drupal\opencase_entities\OCActivityTranslationHandler",
+ *
+ *     "form" = {
+ *       "default" = "Drupal\opencase_entities\Form\OCActivityForm",
+ *       "add" = "Drupal\opencase_entities\Form\OCActivityForm",
+ *       "edit" = "Drupal\opencase_entities\Form\OCActivityForm",
+ *       "delete" = "Drupal\opencase_entities\Form\OCActivityDeleteForm",
+ *     },
+ *     "access" = "Drupal\opencase_entities\OCActivityAccessControlHandler",
+ *     "route_provider" = {
+ *       "html" = "Drupal\opencase_entities\OCActivityHtmlRouteProvider",
+ *     },
+ *   },
+ *   base_table = "oc_activity",
+ *   data_table = "oc_activity_field_data",
+ *   revision_table = "oc_activity_revision",
+ *   revision_data_table = "oc_activity_field_revision",
+ *   translatable = TRUE,
+ *   admin_permission = "administer activity entities",
+ *   entity_keys = {
+ *     "id" = "id",
+ *     "revision" = "vid",
+ *     "bundle" = "type",
+ *     "label" = "name",
+ *     "uuid" = "uuid",
+ *     "uid" = "user_id",
+ *     "langcode" = "langcode",
+ *     "status" = "status",
+ *   },
+ *   links = {
+ *     "canonical" = "/admin/opencase/oc_activity/{oc_activity}",
+ *     "add-page" = "/admin/opencase/oc_activity/add",
+ *     "add-form" = "/admin/opencase/oc_activity/add/{oc_activity_type}",
+ *     "edit-form" = "/admin/opencase/oc_activity/{oc_activity}/edit",
+ *     "delete-form" = "/admin/opencase/oc_activity/{oc_activity}/delete",
+ *     "version-history" = "/admin/opencase/oc_activity/{oc_activity}/revisions",
+ *     "revision" = "/admin/opencase/oc_activity/{oc_activity}/revisions/{oc_activity_revision}/view",
+ *     "revision_revert" = "/admin/opencase/oc_activity/{oc_activity}/revisions/{oc_activity_revision}/revert",
+ *     "revision_delete" = "/admin/opencase/oc_activity/{oc_activity}/revisions/{oc_activity_revision}/delete",
+ *     "translation_revert" = "/admin/opencase/oc_activity/{oc_activity}/revisions/{oc_activity_revision}/revert/{langcode}",
+ *     "collection" = "/admin/opencase/oc_activity",
+ *   },
+ *   bundle_entity_type = "oc_activity_type",
+ *   field_ui_base_route = "entity.oc_activity_type.edit_form"
+ * )
+ */
+class OCActivity extends RevisionableContentEntityBase implements OCActivityInterface {
+
+  use EntityChangedTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function preCreate(EntityStorageInterface $storage_controller, array &$values) {
+    parent::preCreate($storage_controller, $values);
+    $values += [
+      'user_id' => \Drupal::currentUser()->id(),
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function urlRouteParameters($rel) {
+    $uri_route_parameters = parent::urlRouteParameters($rel);
+
+    if ($rel === 'revision_revert' && $this instanceof RevisionableInterface) {
+      $uri_route_parameters[$this->getEntityTypeId() . '_revision'] = $this->getRevisionId();
+    }
+    elseif ($rel === 'revision_delete' && $this instanceof RevisionableInterface) {
+      $uri_route_parameters[$this->getEntityTypeId() . '_revision'] = $this->getRevisionId();
+    }
+
+    return $uri_route_parameters;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function preSave(EntityStorageInterface $storage) {
+    parent::preSave($storage);
+
+    foreach (array_keys($this->getTranslationLanguages()) as $langcode) {
+      $translation = $this->getTranslation($langcode);
+
+      // If no owner has been set explicitly, make the anonymous user the owner.
+      if (!$translation->getOwner()) {
+        $translation->setOwnerId(0);
+      }
+    }
+
+    // If no revision author has been set explicitly, make the oc_activity owner the
+    // revision author.
+    if (!$this->getRevisionUser()) {
+      $this->setRevisionUserId($this->getOwnerId());
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getName() {
+    return $this->get('name')->value;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setName($name) {
+    $this->set('name', $name);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCreatedTime() {
+    return $this->get('created')->value;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setCreatedTime($timestamp) {
+    $this->set('created', $timestamp);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getOwner() {
+    return $this->get('user_id')->entity;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getOwnerId() {
+    return $this->get('user_id')->target_id;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setOwnerId($uid) {
+    $this->set('user_id', $uid);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setOwner(UserInterface $account) {
+    $this->set('user_id', $account->id());
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isPublished() {
+    return (bool) $this->getEntityKey('status');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setPublished($published) {
+    $this->set('status', $published ? TRUE : FALSE);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
+    $fields = parent::baseFieldDefinitions($entity_type);
+
+    $fields['user_id'] = BaseFieldDefinition::create('entity_reference')
+      ->setLabel(t('Authored by'))
+      ->setDescription(t('The user ID of author of the Activity entity.'))
+      ->setRevisionable(TRUE)
+      ->setSetting('target_type', 'user')
+      ->setSetting('handler', 'default')
+      ->setTranslatable(TRUE)
+      ->setDisplayOptions('view', [
+        'label' => 'hidden',
+        'type' => 'author',
+        'weight' => 0,
+      ])
+      ->setDisplayOptions('form', [
+        'type' => 'entity_reference_autocomplete',
+        'weight' => 5,
+        'settings' => [
+          'match_operator' => 'CONTAINS',
+          'size' => '60',
+          'autocomplete_type' => 'tags',
+          'placeholder' => '',
+        ],
+      ])
+      ->setDisplayConfigurable('form', TRUE)
+      ->setDisplayConfigurable('view', TRUE);
+
+    $fields['name'] = BaseFieldDefinition::create('string')
+      ->setLabel(t('Name'))
+      ->setDescription(t('The name of the Activity entity.'))
+      ->setRevisionable(TRUE)
+      ->setSettings([
+        'max_length' => 50,
+        'text_processing' => 0,
+      ])
+      ->setDefaultValue('')
+      ->setDisplayOptions('view', [
+        'label' => 'above',
+        'type' => 'string',
+        'weight' => -4,
+      ])
+      ->setDisplayOptions('form', [
+        'type' => 'string_textfield',
+        'weight' => -4,
+      ])
+      ->setDisplayConfigurable('form', TRUE)
+      ->setDisplayConfigurable('view', TRUE)
+      ->setRequired(TRUE);
+
+    $fields['status'] = BaseFieldDefinition::create('boolean')
+      ->setLabel(t('Publishing status'))
+      ->setDescription(t('A boolean indicating whether the Activity is published.'))
+      ->setRevisionable(TRUE)
+      ->setDefaultValue(TRUE)
+      ->setDisplayOptions('form', [
+        'type' => 'boolean_checkbox',
+        'weight' => -3,
+      ]);
+
+    $fields['created'] = BaseFieldDefinition::create('created')
+      ->setLabel(t('Created'))
+      ->setDescription(t('The time that the entity was created.'));
+
+    $fields['changed'] = BaseFieldDefinition::create('changed')
+      ->setLabel(t('Changed'))
+      ->setDescription(t('The time that the entity was last edited.'));
+
+    $fields['revision_translation_affected'] = BaseFieldDefinition::create('boolean')
+      ->setLabel(t('Revision translation affected'))
+      ->setDescription(t('Indicates if the last edit of a translation belongs to current revision.'))
+      ->setReadOnly(TRUE)
+      ->setRevisionable(TRUE)
+      ->setTranslatable(TRUE);
+
+    return $fields;
+  }
+
+}

modules/opencase_entities/src/Entity/OCActivityInterface.php

@@ -0,0 +1,116 @@
+<?php
+
+namespace Drupal\opencase_entities\Entity;
+
+use Drupal\Core\Entity\ContentEntityInterface;
+use Drupal\Core\Entity\RevisionLogInterface;
+use Drupal\Core\Entity\EntityChangedInterface;
+use Drupal\user\EntityOwnerInterface;
+
+/**
+ * Provides an interface for defining Activity entities.
+ *
+ * @ingroup opencase_entities
+ */
+interface OCActivityInterface extends ContentEntityInterface, RevisionLogInterface, EntityChangedInterface, EntityOwnerInterface {
+
+  // Add get/set methods for your configuration properties here.
+
+  /**
+   * Gets the Activity name.
+   *
+   * @return string
+   *   Name of the Activity.
+   */
+  public function getName();
+
+  /**
+   * Sets the Activity name.
+   *
+   * @param string $name
+   *   The Activity name.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCActivityInterface
+   *   The called Activity entity.
+   */
+  public function setName($name);
+
+  /**
+   * Gets the Activity creation timestamp.
+   *
+   * @return int
+   *   Creation timestamp of the Activity.
+   */
+  public function getCreatedTime();
+
+  /**
+   * Sets the Activity creation timestamp.
+   *
+   * @param int $timestamp
+   *   The Activity creation timestamp.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCActivityInterface
+   *   The called Activity entity.
+   */
+  public function setCreatedTime($timestamp);
+
+  /**
+   * Returns the Activity published status indicator.
+   *
+   * Unpublished Activity are only visible to restricted users.
+   *
+   * @return bool
+   *   TRUE if the Activity is published.
+   */
+  public function isPublished();
+
+  /**
+   * Sets the published status of a Activity.
+   *
+   * @param bool $published
+   *   TRUE to set this Activity to published, FALSE to set it to unpublished.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCActivityInterface
+   *   The called Activity entity.
+   */
+  public function setPublished($published);
+
+  /**
+   * Gets the Activity revision creation timestamp.
+   *
+   * @return int
+   *   The UNIX timestamp of when this revision was created.
+   */
+  public function getRevisionCreationTime();
+
+  /**
+   * Sets the Activity revision creation timestamp.
+   *
+   * @param int $timestamp
+   *   The UNIX timestamp of when this revision was created.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCActivityInterface
+   *   The called Activity entity.
+   */
+  public function setRevisionCreationTime($timestamp);
+
+  /**
+   * Gets the Activity revision author.
+   *
+   * @return \Drupal\user\UserInterface
+   *   The user entity for the revision author.
+   */
+  public function getRevisionUser();
+
+  /**
+   * Sets the Activity revision author.
+   *
+   * @param int $uid
+   *   The user ID of the revision author.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCActivityInterface
+   *   The called Activity entity.
+   */
+  public function setRevisionUserId($uid);
+
+}

modules/opencase_entities/src/Entity/OCActivityType.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace Drupal\opencase_entities\Entity;
+
+use Drupal\Core\Config\Entity\ConfigEntityBundleBase;
+
+/**
+ * Defines the Activity type entity.
+ *
+ * @ConfigEntityType(
+ *   id = "oc_activity_type",
+ *   label = @Translation("Activity type"),
+ *   handlers = {
+ *     "view_builder" = "Drupal\Core\Entity\EntityViewBuilder",
+ *     "list_builder" = "Drupal\opencase_entities\OCActivityTypeListBuilder",
+ *     "form" = {
+ *       "add" = "Drupal\opencase_entities\Form\OCActivityTypeForm",
+ *       "edit" = "Drupal\opencase_entities\Form\OCActivityTypeForm",
+ *       "delete" = "Drupal\opencase_entities\Form\OCActivityTypeDeleteForm"
+ *     },
+ *     "route_provider" = {
+ *       "html" = "Drupal\opencase_entities\OCActivityTypeHtmlRouteProvider",
+ *     },
+ *   },
+ *   config_prefix = "oc_activity_type",
+ *   admin_permission = "administer site configuration",
+ *   bundle_of = "oc_activity",
+ *   entity_keys = {
+ *     "id" = "id",
+ *     "label" = "label",
+ *     "uuid" = "uuid"
+ *   },
+ *   links = {
+ *     "canonical" = "/admin/opencase/oc_activity_type/{oc_activity_type}",
+ *     "add-form" = "/admin/opencase/oc_activity_type/add",
+ *     "edit-form" = "/admin/opencase/oc_activity_type/{oc_activity_type}/edit",
+ *     "delete-form" = "/admin/opencase/oc_activity_type/{oc_activity_type}/delete",
+ *     "collection" = "/admin/opencase/oc_activity_type"
+ *   }
+ * )
+ */
+class OCActivityType extends ConfigEntityBundleBase implements OCActivityTypeInterface {
+
+  /**
+   * The Activity type ID.
+   *
+   * @var string
+   */
+  protected $id;
+
+  /**
+   * The Activity type label.
+   *
+   * @var string
+   */
+  protected $label;
+
+}

modules/opencase_entities/src/Entity/OCActivityTypeInterface.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Drupal\opencase_entities\Entity;
+
+use Drupal\Core\Config\Entity\ConfigEntityInterface;
+
+/**
+ * Provides an interface for defining Activity type entities.
+ */
+interface OCActivityTypeInterface extends ConfigEntityInterface {
+
+  // Add get/set methods for your configuration properties here.
+}

modules/opencase_entities/src/Entity/OCActivityViewsData.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Drupal\opencase_entities\Entity;
+
+use Drupal\views\EntityViewsData;
+
+/**
+ * Provides Views data for Activity entities.
+ */
+class OCActivityViewsData extends EntityViewsData {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getViewsData() {
+    $data = parent::getViewsData();
+
+    // Additional information for Views integration, such as table joins, can be
+    // put here.
+
+    return $data;
+  }
+
+}

modules/opencase_entities/src/Entity/OCActor.php

@@ -0,0 +1,281 @@
+<?php
+
+namespace Drupal\opencase_entities\Entity;
+
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Field\BaseFieldDefinition;
+use Drupal\Core\Entity\RevisionableContentEntityBase;
+use Drupal\Core\Entity\RevisionableInterface;
+use Drupal\Core\Entity\EntityChangedTrait;
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\user\UserInterface;
+
+/**
+ * Defines the Actor entity.
+ *
+ * @ingroup opencase_entities
+ *
+ * @ContentEntityType(
+ *   id = "oc_actor",
+ *   label = @Translation("Actor"),
+ *   bundle_label = @Translation("Actor type"),
+ *   handlers = {
+ *     "storage" = "Drupal\opencase_entities\OCActorStorage",
+ *     "view_builder" = "Drupal\Core\Entity\EntityViewBuilder",
+ *     "list_builder" = "Drupal\opencase_entities\OCActorListBuilder",
+ *     "views_data" = "Drupal\opencase_entities\Entity\OCActorViewsData",
+ *     "translation" = "Drupal\opencase_entities\OCActorTranslationHandler",
+ *
+ *     "form" = {
+ *       "default" = "Drupal\opencase_entities\Form\OCActorForm",
+ *       "add" = "Drupal\opencase_entities\Form\OCActorForm",
+ *       "edit" = "Drupal\opencase_entities\Form\OCActorForm",
+ *       "delete" = "Drupal\opencase_entities\Form\OCActorDeleteForm",
+ *     },
+ *     "access" = "Drupal\opencase_entities\OCActorAccessControlHandler",
+ *     "route_provider" = {
+ *       "html" = "Drupal\opencase_entities\OCActorHtmlRouteProvider",
+ *     },
+ *   },
+ *   base_table = "oc_actor",
+ *   data_table = "oc_actor_field_data",
+ *   revision_table = "oc_actor_revision",
+ *   revision_data_table = "oc_actor_field_revision",
+ *   translatable = TRUE,
+ *   admin_permission = "administer actor entities",
+ *   entity_keys = {
+ *     "id" = "id",
+ *     "revision" = "vid",
+ *     "bundle" = "type",
+ *     "label" = "name",
+ *     "uuid" = "uuid",
+ *     "uid" = "user_id",
+ *     "langcode" = "langcode",
+ *     "status" = "status",
+ *   },
+ *   links = {
+ *     "canonical" = "/admin/opencase/oc_actor/{oc_actor}",
+ *     "add-page" = "/admin/opencase/oc_actor/add",
+ *     "add-form" = "/admin/opencase/oc_actor/add/{oc_actor_type}",
+ *     "edit-form" = "/admin/opencase/oc_actor/{oc_actor}/edit",
+ *     "delete-form" = "/admin/opencase/oc_actor/{oc_actor}/delete",
+ *     "version-history" = "/admin/opencase/oc_actor/{oc_actor}/revisions",
+ *     "revision" = "/admin/opencase/oc_actor/{oc_actor}/revisions/{oc_actor_revision}/view",
+ *     "revision_revert" = "/admin/opencase/oc_actor/{oc_actor}/revisions/{oc_actor_revision}/revert",
+ *     "revision_delete" = "/admin/opencase/oc_actor/{oc_actor}/revisions/{oc_actor_revision}/delete",
+ *     "translation_revert" = "/admin/opencase/oc_actor/{oc_actor}/revisions/{oc_actor_revision}/revert/{langcode}",
+ *     "collection" = "/admin/opencase/oc_actor",
+ *   },
+ *   bundle_entity_type = "oc_actor_type",
+ *   field_ui_base_route = "entity.oc_actor_type.edit_form"
+ * )
+ */
+class OCActor extends RevisionableContentEntityBase implements OCActorInterface {
+
+  use EntityChangedTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function preCreate(EntityStorageInterface $storage_controller, array &$values) {
+    parent::preCreate($storage_controller, $values);
+    $values += [
+      'user_id' => \Drupal::currentUser()->id(),
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function urlRouteParameters($rel) {
+    $uri_route_parameters = parent::urlRouteParameters($rel);
+
+    if ($rel === 'revision_revert' && $this instanceof RevisionableInterface) {
+      $uri_route_parameters[$this->getEntityTypeId() . '_revision'] = $this->getRevisionId();
+    }
+    elseif ($rel === 'revision_delete' && $this instanceof RevisionableInterface) {
+      $uri_route_parameters[$this->getEntityTypeId() . '_revision'] = $this->getRevisionId();
+    }
+
+    return $uri_route_parameters;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function preSave(EntityStorageInterface $storage) {
+    parent::preSave($storage);
+
+    foreach (array_keys($this->getTranslationLanguages()) as $langcode) {
+      $translation = $this->getTranslation($langcode);
+
+      // If no owner has been set explicitly, make the anonymous user the owner.
+      if (!$translation->getOwner()) {
+        $translation->setOwnerId(0);
+      }
+    }
+
+    // If no revision author has been set explicitly, make the oc_actor owner the
+    // revision author.
+    if (!$this->getRevisionUser()) {
+      $this->setRevisionUserId($this->getOwnerId());
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getName() {
+    return $this->get('name')->value;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setName($name) {
+    $this->set('name', $name);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCreatedTime() {
+    return $this->get('created')->value;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setCreatedTime($timestamp) {
+    $this->set('created', $timestamp);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getOwner() {
+    return $this->get('user_id')->entity;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getOwnerId() {
+    return $this->get('user_id')->target_id;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setOwnerId($uid) {
+    $this->set('user_id', $uid);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setOwner(UserInterface $account) {
+    $this->set('user_id', $account->id());
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isPublished() {
+    return (bool) $this->getEntityKey('status');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setPublished($published) {
+    $this->set('status', $published ? TRUE : FALSE);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
+    $fields = parent::baseFieldDefinitions($entity_type);
+
+    $fields['user_id'] = BaseFieldDefinition::create('entity_reference')
+      ->setLabel(t('Authored by'))
+      ->setDescription(t('The user ID of author of the Actor entity.'))
+      ->setRevisionable(TRUE)
+      ->setSetting('target_type', 'user')
+      ->setSetting('handler', 'default')
+      ->setTranslatable(TRUE)
+      ->setDisplayOptions('view', [
+        'label' => 'hidden',
+        'type' => 'author',
+        'weight' => 0,
+      ])
+      ->setDisplayOptions('form', [
+        'type' => 'entity_reference_autocomplete',
+        'weight' => 5,
+        'settings' => [
+          'match_operator' => 'CONTAINS',
+          'size' => '60',
+          'autocomplete_type' => 'tags',
+          'placeholder' => '',
+        ],
+      ])
+      ->setDisplayConfigurable('form', TRUE)
+      ->setDisplayConfigurable('view', TRUE);
+
+    $fields['name'] = BaseFieldDefinition::create('string')
+      ->setLabel(t('Name'))
+      ->setDescription(t('The name of the Actor entity.'))
+      ->setRevisionable(TRUE)
+      ->setSettings([
+        'max_length' => 50,
+        'text_processing' => 0,
+      ])
+      ->setDefaultValue('')
+      ->setDisplayOptions('view', [
+        'label' => 'above',
+        'type' => 'string',
+        'weight' => -4,
+      ])
+      ->setDisplayOptions('form', [
+        'type' => 'string_textfield',
+        'weight' => -4,
+      ])
+      ->setDisplayConfigurable('form', TRUE)
+      ->setDisplayConfigurable('view', TRUE)
+      ->setRequired(TRUE);
+
+    $fields['status'] = BaseFieldDefinition::create('boolean')
+      ->setLabel(t('Publishing status'))
+      ->setDescription(t('A boolean indicating whether the Actor is published.'))
+      ->setRevisionable(TRUE)
+      ->setDefaultValue(TRUE)
+      ->setDisplayOptions('form', [
+        'type' => 'boolean_checkbox',
+        'weight' => -3,
+      ]);
+
+    $fields['created'] = BaseFieldDefinition::create('created')
+      ->setLabel(t('Created'))
+      ->setDescription(t('The time that the entity was created.'));
+
+    $fields['changed'] = BaseFieldDefinition::create('changed')
+      ->setLabel(t('Changed'))
+      ->setDescription(t('The time that the entity was last edited.'));
+
+    $fields['revision_translation_affected'] = BaseFieldDefinition::create('boolean')
+      ->setLabel(t('Revision translation affected'))
+      ->setDescription(t('Indicates if the last edit of a translation belongs to current revision.'))
+      ->setReadOnly(TRUE)
+      ->setRevisionable(TRUE)
+      ->setTranslatable(TRUE);
+
+    return $fields;
+  }
+
+}

modules/opencase_entities/src/Entity/OCActorInterface.php

@@ -0,0 +1,116 @@
+<?php
+
+namespace Drupal\opencase_entities\Entity;
+
+use Drupal\Core\Entity\ContentEntityInterface;
+use Drupal\Core\Entity\RevisionLogInterface;
+use Drupal\Core\Entity\EntityChangedInterface;
+use Drupal\user\EntityOwnerInterface;
+
+/**
+ * Provides an interface for defining Actor entities.
+ *
+ * @ingroup opencase_entities
+ */
+interface OCActorInterface extends ContentEntityInterface, RevisionLogInterface, EntityChangedInterface, EntityOwnerInterface {
+
+  // Add get/set methods for your configuration properties here.
+
+  /**
+   * Gets the Actor name.
+   *
+   * @return string
+   *   Name of the Actor.
+   */
+  public function getName();
+
+  /**
+   * Sets the Actor name.
+   *
+   * @param string $name
+   *   The Actor name.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCActorInterface
+   *   The called Actor entity.
+   */
+  public function setName($name);
+
+  /**
+   * Gets the Actor creation timestamp.
+   *
+   * @return int
+   *   Creation timestamp of the Actor.
+   */
+  public function getCreatedTime();
+
+  /**
+   * Sets the Actor creation timestamp.
+   *
+   * @param int $timestamp
+   *   The Actor creation timestamp.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCActorInterface
+   *   The called Actor entity.
+   */
+  public function setCreatedTime($timestamp);
+
+  /**
+   * Returns the Actor published status indicator.
+   *
+   * Unpublished Actor are only visible to restricted users.
+   *
+   * @return bool
+   *   TRUE if the Actor is published.
+   */
+  public function isPublished();
+
+  /**
+   * Sets the published status of a Actor.
+   *
+   * @param bool $published
+   *   TRUE to set this Actor to published, FALSE to set it to unpublished.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCActorInterface
+   *   The called Actor entity.
+   */
+  public function setPublished($published);
+
+  /**
+   * Gets the Actor revision creation timestamp.
+   *
+   * @return int
+   *   The UNIX timestamp of when this revision was created.
+   */
+  public function getRevisionCreationTime();
+
+  /**
+   * Sets the Actor revision creation timestamp.
+   *
+   * @param int $timestamp
+   *   The UNIX timestamp of when this revision was created.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCActorInterface
+   *   The called Actor entity.
+   */
+  public function setRevisionCreationTime($timestamp);
+
+  /**
+   * Gets the Actor revision author.
+   *
+   * @return \Drupal\user\UserInterface
+   *   The user entity for the revision author.
+   */
+  public function getRevisionUser();
+
+  /**
+   * Sets the Actor revision author.
+   *
+   * @param int $uid
+   *   The user ID of the revision author.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCActorInterface
+   *   The called Actor entity.
+   */
+  public function setRevisionUserId($uid);
+
+}

modules/opencase_entities/src/Entity/OCActorType.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace Drupal\opencase_entities\Entity;
+
+use Drupal\Core\Config\Entity\ConfigEntityBundleBase;
+
+/**
+ * Defines the Actor type entity.
+ *
+ * @ConfigEntityType(
+ *   id = "oc_actor_type",
+ *   label = @Translation("Actor type"),
+ *   handlers = {
+ *     "view_builder" = "Drupal\Core\Entity\EntityViewBuilder",
+ *     "list_builder" = "Drupal\opencase_entities\OCActorTypeListBuilder",
+ *     "form" = {
+ *       "add" = "Drupal\opencase_entities\Form\OCActorTypeForm",
+ *       "edit" = "Drupal\opencase_entities\Form\OCActorTypeForm",
+ *       "delete" = "Drupal\opencase_entities\Form\OCActorTypeDeleteForm"
+ *     },
+ *     "route_provider" = {
+ *       "html" = "Drupal\opencase_entities\OCActorTypeHtmlRouteProvider",
+ *     },
+ *   },
+ *   config_prefix = "oc_actor_type",
+ *   admin_permission = "administer site configuration",
+ *   bundle_of = "oc_actor",
+ *   entity_keys = {
+ *     "id" = "id",
+ *     "label" = "label",
+ *     "uuid" = "uuid"
+ *   },
+ *   links = {
+ *     "canonical" = "/admin/opencase/oc_actor_type/{oc_actor_type}",
+ *     "add-form" = "/admin/opencase/oc_actor_type/add",
+ *     "edit-form" = "/admin/opencase/oc_actor_type/{oc_actor_type}/edit",
+ *     "delete-form" = "/admin/opencase/oc_actor_type/{oc_actor_type}/delete",
+ *     "collection" = "/admin/opencase/oc_actor_type"
+ *   }
+ * )
+ */
+class OCActorType extends ConfigEntityBundleBase implements OCActorTypeInterface {
+
+  /**
+   * The Actor type ID.
+   *
+   * @var string
+   */
+  protected $id;
+
+  /**
+   * The Actor type label.
+   *
+   * @var string
+   */
+  protected $label;
+
+}

modules/opencase_entities/src/Entity/OCActorTypeInterface.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Drupal\opencase_entities\Entity;
+
+use Drupal\Core\Config\Entity\ConfigEntityInterface;
+
+/**
+ * Provides an interface for defining Actor type entities.
+ */
+interface OCActorTypeInterface extends ConfigEntityInterface {
+
+  // Add get/set methods for your configuration properties here.
+}

modules/opencase_entities/src/Entity/OCActorViewsData.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Drupal\opencase_entities\Entity;
+
+use Drupal\views\EntityViewsData;
+
+/**
+ * Provides Views data for Actor entities.
+ */
+class OCActorViewsData extends EntityViewsData {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getViewsData() {
+    $data = parent::getViewsData();
+
+    // Additional information for Views integration, such as table joins, can be
+    // put here.
+
+    return $data;
+  }
+
+}

modules/opencase_entities/src/Entity/OCCase.php

@@ -0,0 +1,281 @@
+<?php
+
+namespace Drupal\opencase_entities\Entity;
+
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Field\BaseFieldDefinition;
+use Drupal\Core\Entity\RevisionableContentEntityBase;
+use Drupal\Core\Entity\RevisionableInterface;
+use Drupal\Core\Entity\EntityChangedTrait;
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\user\UserInterface;
+
+/**
+ * Defines the Case entity.
+ *
+ * @ingroup opencase_entities
+ *
+ * @ContentEntityType(
+ *   id = "oc_case",
+ *   label = @Translation("Case"),
+ *   bundle_label = @Translation("Case type"),
+ *   handlers = {
+ *     "storage" = "Drupal\opencase_entities\OCCaseStorage",
+ *     "view_builder" = "Drupal\Core\Entity\EntityViewBuilder",
+ *     "list_builder" = "Drupal\opencase_entities\OCCaseListBuilder",
+ *     "views_data" = "Drupal\opencase_entities\Entity\OCCaseViewsData",
+ *     "translation" = "Drupal\opencase_entities\OCCaseTranslationHandler",
+ *
+ *     "form" = {
+ *       "default" = "Drupal\opencase_entities\Form\OCCaseForm",
+ *       "add" = "Drupal\opencase_entities\Form\OCCaseForm",
+ *       "edit" = "Drupal\opencase_entities\Form\OCCaseForm",
+ *       "delete" = "Drupal\opencase_entities\Form\OCCaseDeleteForm",
+ *     },
+ *     "access" = "Drupal\opencase_entities\OCCaseAccessControlHandler",
+ *     "route_provider" = {
+ *       "html" = "Drupal\opencase_entities\OCCaseHtmlRouteProvider",
+ *     },
+ *   },
+ *   base_table = "oc_case",
+ *   data_table = "oc_case_field_data",
+ *   revision_table = "oc_case_revision",
+ *   revision_data_table = "oc_case_field_revision",
+ *   translatable = TRUE,
+ *   admin_permission = "administer case entities",
+ *   entity_keys = {
+ *     "id" = "id",
+ *     "revision" = "vid",
+ *     "bundle" = "type",
+ *     "label" = "name",
+ *     "uuid" = "uuid",
+ *     "uid" = "user_id",
+ *     "langcode" = "langcode",
+ *     "status" = "status",
+ *   },
+ *   links = {
+ *     "canonical" = "/admin/opencase/oc_case/{oc_case}",
+ *     "add-page" = "/admin/opencase/oc_case/add",
+ *     "add-form" = "/admin/opencase/oc_case/add/{oc_case_type}",
+ *     "edit-form" = "/admin/opencase/oc_case/{oc_case}/edit",
+ *     "delete-form" = "/admin/opencase/oc_case/{oc_case}/delete",
+ *     "version-history" = "/admin/opencase/oc_case/{oc_case}/revisions",
+ *     "revision" = "/admin/opencase/oc_case/{oc_case}/revisions/{oc_case_revision}/view",
+ *     "revision_revert" = "/admin/opencase/oc_case/{oc_case}/revisions/{oc_case_revision}/revert",
+ *     "revision_delete" = "/admin/opencase/oc_case/{oc_case}/revisions/{oc_case_revision}/delete",
+ *     "translation_revert" = "/admin/opencase/oc_case/{oc_case}/revisions/{oc_case_revision}/revert/{langcode}",
+ *     "collection" = "/admin/opencase/oc_case",
+ *   },
+ *   bundle_entity_type = "oc_case_type",
+ *   field_ui_base_route = "entity.oc_case_type.edit_form"
+ * )
+ */
+class OCCase extends RevisionableContentEntityBase implements OCCaseInterface {
+
+  use EntityChangedTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function preCreate(EntityStorageInterface $storage_controller, array &$values) {
+    parent::preCreate($storage_controller, $values);
+    $values += [
+      'user_id' => \Drupal::currentUser()->id(),
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function urlRouteParameters($rel) {
+    $uri_route_parameters = parent::urlRouteParameters($rel);
+
+    if ($rel === 'revision_revert' && $this instanceof RevisionableInterface) {
+      $uri_route_parameters[$this->getEntityTypeId() . '_revision'] = $this->getRevisionId();
+    }
+    elseif ($rel === 'revision_delete' && $this instanceof RevisionableInterface) {
+      $uri_route_parameters[$this->getEntityTypeId() . '_revision'] = $this->getRevisionId();
+    }
+
+    return $uri_route_parameters;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function preSave(EntityStorageInterface $storage) {
+    parent::preSave($storage);
+
+    foreach (array_keys($this->getTranslationLanguages()) as $langcode) {
+      $translation = $this->getTranslation($langcode);
+
+      // If no owner has been set explicitly, make the anonymous user the owner.
+      if (!$translation->getOwner()) {
+        $translation->setOwnerId(0);
+      }
+    }
+
+    // If no revision author has been set explicitly, make the oc_case owner the
+    // revision author.
+    if (!$this->getRevisionUser()) {
+      $this->setRevisionUserId($this->getOwnerId());
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getName() {
+    return $this->get('name')->value;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setName($name) {
+    $this->set('name', $name);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCreatedTime() {
+    return $this->get('created')->value;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setCreatedTime($timestamp) {
+    $this->set('created', $timestamp);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getOwner() {
+    return $this->get('user_id')->entity;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getOwnerId() {
+    return $this->get('user_id')->target_id;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setOwnerId($uid) {
+    $this->set('user_id', $uid);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setOwner(UserInterface $account) {
+    $this->set('user_id', $account->id());
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isPublished() {
+    return (bool) $this->getEntityKey('status');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setPublished($published) {
+    $this->set('status', $published ? TRUE : FALSE);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
+    $fields = parent::baseFieldDefinitions($entity_type);
+
+    $fields['user_id'] = BaseFieldDefinition::create('entity_reference')
+      ->setLabel(t('Authored by'))
+      ->setDescription(t('The user ID of author of the Case entity.'))
+      ->setRevisionable(TRUE)
+      ->setSetting('target_type', 'user')
+      ->setSetting('handler', 'default')
+      ->setTranslatable(TRUE)
+      ->setDisplayOptions('view', [
+        'label' => 'hidden',
+        'type' => 'author',
+        'weight' => 0,
+      ])
+      ->setDisplayOptions('form', [
+        'type' => 'entity_reference_autocomplete',
+        'weight' => 5,
+        'settings' => [
+          'match_operator' => 'CONTAINS',
+          'size' => '60',
+          'autocomplete_type' => 'tags',
+          'placeholder' => '',
+        ],
+      ])
+      ->setDisplayConfigurable('form', TRUE)
+      ->setDisplayConfigurable('view', TRUE);
+
+    $fields['name'] = BaseFieldDefinition::create('string')
+      ->setLabel(t('Name'))
+      ->setDescription(t('The name of the Case entity.'))
+      ->setRevisionable(TRUE)
+      ->setSettings([
+        'max_length' => 50,
+        'text_processing' => 0,
+      ])
+      ->setDefaultValue('')
+      ->setDisplayOptions('view', [
+        'label' => 'above',
+        'type' => 'string',
+        'weight' => -4,
+      ])
+      ->setDisplayOptions('form', [
+        'type' => 'string_textfield',
+        'weight' => -4,
+      ])
+      ->setDisplayConfigurable('form', TRUE)
+      ->setDisplayConfigurable('view', TRUE)
+      ->setRequired(TRUE);
+
+    $fields['status'] = BaseFieldDefinition::create('boolean')
+      ->setLabel(t('Publishing status'))
+      ->setDescription(t('A boolean indicating whether the Case is published.'))
+      ->setRevisionable(TRUE)
+      ->setDefaultValue(TRUE)
+      ->setDisplayOptions('form', [
+        'type' => 'boolean_checkbox',
+        'weight' => -3,
+      ]);
+
+    $fields['created'] = BaseFieldDefinition::create('created')
+      ->setLabel(t('Created'))
+      ->setDescription(t('The time that the entity was created.'));
+
+    $fields['changed'] = BaseFieldDefinition::create('changed')
+      ->setLabel(t('Changed'))
+      ->setDescription(t('The time that the entity was last edited.'));
+
+    $fields['revision_translation_affected'] = BaseFieldDefinition::create('boolean')
+      ->setLabel(t('Revision translation affected'))
+      ->setDescription(t('Indicates if the last edit of a translation belongs to current revision.'))
+      ->setReadOnly(TRUE)
+      ->setRevisionable(TRUE)
+      ->setTranslatable(TRUE);
+
+    return $fields;
+  }
+
+}

modules/opencase_entities/src/Entity/OCCaseInterface.php

@@ -0,0 +1,116 @@
+<?php
+
+namespace Drupal\opencase_entities\Entity;
+
+use Drupal\Core\Entity\ContentEntityInterface;
+use Drupal\Core\Entity\RevisionLogInterface;
+use Drupal\Core\Entity\EntityChangedInterface;
+use Drupal\user\EntityOwnerInterface;
+
+/**
+ * Provides an interface for defining Case entities.
+ *
+ * @ingroup opencase_entities
+ */
+interface OCCaseInterface extends ContentEntityInterface, RevisionLogInterface, EntityChangedInterface, EntityOwnerInterface {
+
+  // Add get/set methods for your configuration properties here.
+
+  /**
+   * Gets the Case name.
+   *
+   * @return string
+   *   Name of the Case.
+   */
+  public function getName();
+
+  /**
+   * Sets the Case name.
+   *
+   * @param string $name
+   *   The Case name.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCCaseInterface
+   *   The called Case entity.
+   */
+  public function setName($name);
+
+  /**
+   * Gets the Case creation timestamp.
+   *
+   * @return int
+   *   Creation timestamp of the Case.
+   */
+  public function getCreatedTime();
+
+  /**
+   * Sets the Case creation timestamp.
+   *
+   * @param int $timestamp
+   *   The Case creation timestamp.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCCaseInterface
+   *   The called Case entity.
+   */
+  public function setCreatedTime($timestamp);
+
+  /**
+   * Returns the Case published status indicator.
+   *
+   * Unpublished Case are only visible to restricted users.
+   *
+   * @return bool
+   *   TRUE if the Case is published.
+   */
+  public function isPublished();
+
+  /**
+   * Sets the published status of a Case.
+   *
+   * @param bool $published
+   *   TRUE to set this Case to published, FALSE to set it to unpublished.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCCaseInterface
+   *   The called Case entity.
+   */
+  public function setPublished($published);
+
+  /**
+   * Gets the Case revision creation timestamp.
+   *
+   * @return int
+   *   The UNIX timestamp of when this revision was created.
+   */
+  public function getRevisionCreationTime();
+
+  /**
+   * Sets the Case revision creation timestamp.
+   *
+   * @param int $timestamp
+   *   The UNIX timestamp of when this revision was created.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCCaseInterface
+   *   The called Case entity.
+   */
+  public function setRevisionCreationTime($timestamp);
+
+  /**
+   * Gets the Case revision author.
+   *
+   * @return \Drupal\user\UserInterface
+   *   The user entity for the revision author.
+   */
+  public function getRevisionUser();
+
+  /**
+   * Sets the Case revision author.
+   *
+   * @param int $uid
+   *   The user ID of the revision author.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCCaseInterface
+   *   The called Case entity.
+   */
+  public function setRevisionUserId($uid);
+
+}

modules/opencase_entities/src/Entity/OCCaseType.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace Drupal\opencase_entities\Entity;
+
+use Drupal\Core\Config\Entity\ConfigEntityBundleBase;
+
+/**
+ * Defines the Case type entity.
+ *
+ * @ConfigEntityType(
+ *   id = "oc_case_type",
+ *   label = @Translation("Case type"),
+ *   handlers = {
+ *     "view_builder" = "Drupal\Core\Entity\EntityViewBuilder",
+ *     "list_builder" = "Drupal\opencase_entities\OCCaseTypeListBuilder",
+ *     "form" = {
+ *       "add" = "Drupal\opencase_entities\Form\OCCaseTypeForm",
+ *       "edit" = "Drupal\opencase_entities\Form\OCCaseTypeForm",
+ *       "delete" = "Drupal\opencase_entities\Form\OCCaseTypeDeleteForm"
+ *     },
+ *     "route_provider" = {
+ *       "html" = "Drupal\opencase_entities\OCCaseTypeHtmlRouteProvider",
+ *     },
+ *   },
+ *   config_prefix = "oc_case_type",
+ *   admin_permission = "administer site configuration",
+ *   bundle_of = "oc_case",
+ *   entity_keys = {
+ *     "id" = "id",
+ *     "label" = "label",
+ *     "uuid" = "uuid"
+ *   },
+ *   links = {
+ *     "canonical" = "/admin/opencase/oc_case_type/{oc_case_type}",
+ *     "add-form" = "/admin/opencase/oc_case_type/add",
+ *     "edit-form" = "/admin/opencase/oc_case_type/{oc_case_type}/edit",
+ *     "delete-form" = "/admin/opencase/oc_case_type/{oc_case_type}/delete",
+ *     "collection" = "/admin/opencase/oc_case_type"
+ *   }
+ * )
+ */
+class OCCaseType extends ConfigEntityBundleBase implements OCCaseTypeInterface {
+
+  /**
+   * The Case type ID.
+   *
+   * @var string
+   */
+  protected $id;
+
+  /**
+   * The Case type label.
+   *
+   * @var string
+   */
+  protected $label;
+
+}

modules/opencase_entities/src/Entity/OCCaseTypeInterface.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Drupal\opencase_entities\Entity;
+
+use Drupal\Core\Config\Entity\ConfigEntityInterface;
+
+/**
+ * Provides an interface for defining Case type entities.
+ */
+interface OCCaseTypeInterface extends ConfigEntityInterface {
+
+  // Add get/set methods for your configuration properties here.
+}

modules/opencase_entities/src/Entity/OCCaseViewsData.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Drupal\opencase_entities\Entity;
+
+use Drupal\views\EntityViewsData;
+
+/**
+ * Provides Views data for Case entities.
+ */
+class OCCaseViewsData extends EntityViewsData {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getViewsData() {
+    $data = parent::getViewsData();
+
+    // Additional information for Views integration, such as table joins, can be
+    // put here.
+
+    return $data;
+  }
+
+}

modules/opencase_entities/src/Form/OCActivityDeleteForm.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Entity\ContentEntityDeleteForm;
+
+/**
+ * Provides a form for deleting Activity entities.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActivityDeleteForm extends ContentEntityDeleteForm {
+
+
+}

modules/opencase_entities/src/Form/OCActivityForm.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Entity\ContentEntityForm;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Form controller for Activity edit forms.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActivityForm extends ContentEntityForm {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    /* @var $entity \Drupal\opencase_entities\Entity\OCActivity */
+    $form = parent::buildForm($form, $form_state);
+
+    if (!$this->entity->isNew()) {
+      $form['new_revision'] = [
+        '#type' => 'checkbox',
+        '#title' => $this->t('Create new revision'),
+        '#default_value' => FALSE,
+        '#weight' => 10,
+      ];
+    }
+
+    $entity = $this->entity;
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function save(array $form, FormStateInterface $form_state) {
+    $entity = $this->entity;
+
+    // Save as a new revision if requested to do so.
+    if (!$form_state->isValueEmpty('new_revision') && $form_state->getValue('new_revision') != FALSE) {
+      $entity->setNewRevision();
+
+      // If a new revision is created, save the current user as revision author.
+      $entity->setRevisionCreationTime(REQUEST_TIME);
+      $entity->setRevisionUserId(\Drupal::currentUser()->id());
+    }
+    else {
+      $entity->setNewRevision(FALSE);
+    }
+
+    $status = parent::save($form, $form_state);
+
+    switch ($status) {
+      case SAVED_NEW:
+        drupal_set_message($this->t('Created the %label Activity.', [
+          '%label' => $entity->label(),
+        ]));
+        break;
+
+      default:
+        drupal_set_message($this->t('Saved the %label Activity.', [
+          '%label' => $entity->label(),
+        ]));
+    }
+    $form_state->setRedirect('entity.oc_activity.canonical', ['oc_activity' => $entity->id()]);
+  }
+
+}

modules/opencase_entities/src/Form/OCActivityRevisionDeleteForm.php

@@ -0,0 +1,123 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Database\Connection;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Form\ConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a form for deleting a Activity revision.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActivityRevisionDeleteForm extends ConfirmFormBase {
+
+
+  /**
+   * The Activity revision.
+   *
+   * @var \Drupal\opencase_entities\Entity\OCActivityInterface
+   */
+  protected $revision;
+
+  /**
+   * The Activity storage.
+   *
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  protected $OCActivityStorage;
+
+  /**
+   * The database connection.
+   *
+   * @var \Drupal\Core\Database\Connection
+   */
+  protected $connection;
+
+  /**
+   * Constructs a new OCActivityRevisionDeleteForm.
+   *
+   * @param \Drupal\Core\Entity\EntityStorageInterface $entity_storage
+   *   The entity storage.
+   * @param \Drupal\Core\Database\Connection $connection
+   *   The database connection.
+   */
+  public function __construct(EntityStorageInterface $entity_storage, Connection $connection) {
+    $this->OCActivityStorage = $entity_storage;
+    $this->connection = $connection;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    $entity_manager = $container->get('entity.manager');
+    return new static(
+      $entity_manager->getStorage('oc_activity'),
+      $container->get('database')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'oc_activity_revision_delete_confirm';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return t('Are you sure you want to delete the revision from %revision-date?', ['%revision-date' => format_date($this->revision->getRevisionCreationTime())]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCancelUrl() {
+    return new Url('entity.oc_activity.version_history', ['oc_activity' => $this->revision->id()]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfirmText() {
+    return t('Delete');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $oc_activity_revision = NULL) {
+    $this->revision = $this->OCActivityStorage->loadRevision($oc_activity_revision);
+    $form = parent::buildForm($form, $form_state);
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $this->OCActivityStorage->deleteRevision($this->revision->getRevisionId());
+
+    $this->logger('content')->notice('Activity: deleted %title revision %revision.', ['%title' => $this->revision->label(), '%revision' => $this->revision->getRevisionId()]);
+    drupal_set_message(t('Revision from %revision-date of Activity %title has been deleted.', ['%revision-date' => format_date($this->revision->getRevisionCreationTime()), '%title' => $this->revision->label()]));
+    $form_state->setRedirect(
+      'entity.oc_activity.canonical',
+       ['oc_activity' => $this->revision->id()]
+    );
+    if ($this->connection->query('SELECT COUNT(DISTINCT vid) FROM {oc_activity_field_revision} WHERE id = :id', [':id' => $this->revision->id()])->fetchField() > 1) {
+      $form_state->setRedirect(
+        'entity.oc_activity.version_history',
+         ['oc_activity' => $this->revision->id()]
+      );
+    }
+  }
+
+}

modules/opencase_entities/src/Form/OCActivityRevisionRevertForm.php

@@ -0,0 +1,149 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Datetime\DateFormatterInterface;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Form\ConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+use Drupal\opencase_entities\Entity\OCActivityInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a form for reverting a Activity revision.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActivityRevisionRevertForm extends ConfirmFormBase {
+
+
+  /**
+   * The Activity revision.
+   *
+   * @var \Drupal\opencase_entities\Entity\OCActivityInterface
+   */
+  protected $revision;
+
+  /**
+   * The Activity storage.
+   *
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  protected $OCActivityStorage;
+
+  /**
+   * The date formatter service.
+   *
+   * @var \Drupal\Core\Datetime\DateFormatterInterface
+   */
+  protected $dateFormatter;
+
+  /**
+   * Constructs a new OCActivityRevisionRevertForm.
+   *
+   * @param \Drupal\Core\Entity\EntityStorageInterface $entity_storage
+   *   The Activity storage.
+   * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
+   *   The date formatter service.
+   */
+  public function __construct(EntityStorageInterface $entity_storage, DateFormatterInterface $date_formatter) {
+    $this->OCActivityStorage = $entity_storage;
+    $this->dateFormatter = $date_formatter;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('entity.manager')->getStorage('oc_activity'),
+      $container->get('date.formatter')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'oc_activity_revision_revert_confirm';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return t('Are you sure you want to revert to the revision from %revision-date?', ['%revision-date' => $this->dateFormatter->format($this->revision->getRevisionCreationTime())]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCancelUrl() {
+    return new Url('entity.oc_activity.version_history', ['oc_activity' => $this->revision->id()]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfirmText() {
+    return t('Revert');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDescription() {
+    return '';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $oc_activity_revision = NULL) {
+    $this->revision = $this->OCActivityStorage->loadRevision($oc_activity_revision);
+    $form = parent::buildForm($form, $form_state);
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    // The revision timestamp will be updated when the revision is saved. Keep
+    // the original one for the confirmation message.
+    $original_revision_timestamp = $this->revision->getRevisionCreationTime();
+
+    $this->revision = $this->prepareRevertedRevision($this->revision, $form_state);
+    $this->revision->revision_log = t('Copy of the revision from %date.', ['%date' => $this->dateFormatter->format($original_revision_timestamp)]);
+    $this->revision->save();
+
+    $this->logger('content')->notice('Activity: reverted %title revision %revision.', ['%title' => $this->revision->label(), '%revision' => $this->revision->getRevisionId()]);
+    drupal_set_message(t('Activity %title has been reverted to the revision from %revision-date.', ['%title' => $this->revision->label(), '%revision-date' => $this->dateFormatter->format($original_revision_timestamp)]));
+    $form_state->setRedirect(
+      'entity.oc_activity.version_history',
+      ['oc_activity' => $this->revision->id()]
+    );
+  }
+
+  /**
+   * Prepares a revision to be reverted.
+   *
+   * @param \Drupal\opencase_entities\Entity\OCActivityInterface $revision
+   *   The revision to be reverted.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCActivityInterface
+   *   The prepared revision ready to be stored.
+   */
+  protected function prepareRevertedRevision(OCActivityInterface $revision, FormStateInterface $form_state) {
+    $revision->setNewRevision();
+    $revision->isDefaultRevision(TRUE);
+    $revision->setRevisionCreationTime(REQUEST_TIME);
+
+    return $revision;
+  }
+
+}

modules/opencase_entities/src/Form/OCActivityRevisionRevertTranslationForm.php

@@ -0,0 +1,115 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Datetime\DateFormatterInterface;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\opencase_entities\Entity\OCActivityInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a form for reverting a Activity revision for a single translation.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActivityRevisionRevertTranslationForm extends OCActivityRevisionRevertForm {
+
+
+  /**
+   * The language to be reverted.
+   *
+   * @var string
+   */
+  protected $langcode;
+
+  /**
+   * The language manager.
+   *
+   * @var \Drupal\Core\Language\LanguageManagerInterface
+   */
+  protected $languageManager;
+
+  /**
+   * Constructs a new OCActivityRevisionRevertTranslationForm.
+   *
+   * @param \Drupal\Core\Entity\EntityStorageInterface $entity_storage
+   *   The Activity storage.
+   * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
+   *   The date formatter service.
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   The language manager.
+   */
+  public function __construct(EntityStorageInterface $entity_storage, DateFormatterInterface $date_formatter, LanguageManagerInterface $language_manager) {
+    parent::__construct($entity_storage, $date_formatter);
+    $this->languageManager = $language_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('entity.manager')->getStorage('oc_activity'),
+      $container->get('date.formatter'),
+      $container->get('language_manager')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'oc_activity_revision_revert_translation_confirm';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return t('Are you sure you want to revert @language translation to the revision from %revision-date?', ['@language' => $this->languageManager->getLanguageName($this->langcode), '%revision-date' => $this->dateFormatter->format($this->revision->getRevisionCreationTime())]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $oc_activity_revision = NULL, $langcode = NULL) {
+    $this->langcode = $langcode;
+    $form = parent::buildForm($form, $form_state, $oc_activity_revision);
+
+    $form['revert_untranslated_fields'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Revert content shared among translations'),
+      '#default_value' => FALSE,
+    ];
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function prepareRevertedRevision(OCActivityInterface $revision, FormStateInterface $form_state) {
+    $revert_untranslated_fields = $form_state->getValue('revert_untranslated_fields');
+
+    /** @var \Drupal\opencase_entities\Entity\OCActivityInterface $default_revision */
+    $latest_revision = $this->OCActivityStorage->load($revision->id());
+    $latest_revision_translation = $latest_revision->getTranslation($this->langcode);
+
+    $revision_translation = $revision->getTranslation($this->langcode);
+
+    foreach ($latest_revision_translation->getFieldDefinitions() as $field_name => $definition) {
+      if ($definition->isTranslatable() || $revert_untranslated_fields) {
+        $latest_revision_translation->set($field_name, $revision_translation->get($field_name)->getValue());
+      }
+    }
+
+    $latest_revision_translation->setNewRevision();
+    $latest_revision_translation->isDefaultRevision(TRUE);
+    $revision->setRevisionCreationTime(REQUEST_TIME);
+
+    return $latest_revision_translation;
+  }
+
+}

modules/opencase_entities/src/Form/OCActivitySettingsForm.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Class OCActivitySettingsForm.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActivitySettingsForm extends FormBase {
+
+  /**
+   * Returns a unique string identifying the form.
+   *
+   * @return string
+   *   The unique string identifying the form.
+   */
+  public function getFormId() {
+    return 'ocactivity_settings';
+  }
+
+  /**
+   * Form submission handler.
+   *
+   * @param array $form
+   *   An associative array containing the structure of the form.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    // Empty implementation of the abstract submit class.
+  }
+
+  /**
+   * Defines the settings form for Activity entities.
+   *
+   * @param array $form
+   *   An associative array containing the structure of the form.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   *
+   * @return array
+   *   Form definition array.
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $form['ocactivity_settings']['#markup'] = 'Settings form for Activity entities. Manage field settings here.';
+    return $form;
+  }
+
+}

modules/opencase_entities/src/Form/OCActivityTypeDeleteForm.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Entity\EntityConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+
+/**
+ * Builds the form to delete Activity type entities.
+ */
+class OCActivityTypeDeleteForm extends EntityConfirmFormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return $this->t('Are you sure you want to delete %name?', ['%name' => $this->entity->label()]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCancelUrl() {
+    return new Url('entity.oc_activity_type.collection');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfirmText() {
+    return $this->t('Delete');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $this->entity->delete();
+
+    drupal_set_message(
+      $this->t('content @type: deleted @label.',
+        [
+          '@type' => $this->entity->bundle(),
+          '@label' => $this->entity->label(),
+        ]
+        )
+    );
+
+    $form_state->setRedirectUrl($this->getCancelUrl());
+  }
+
+}

modules/opencase_entities/src/Form/OCActivityTypeForm.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Entity\EntityForm;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Class OCActivityTypeForm.
+ */
+class OCActivityTypeForm extends EntityForm {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function form(array $form, FormStateInterface $form_state) {
+    $form = parent::form($form, $form_state);
+
+    $oc_activity_type = $this->entity;
+    $form['label'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Label'),
+      '#maxlength' => 255,
+      '#default_value' => $oc_activity_type->label(),
+      '#description' => $this->t("Label for the Activity type."),
+      '#required' => TRUE,
+    ];
+
+    $form['id'] = [
+      '#type' => 'machine_name',
+      '#default_value' => $oc_activity_type->id(),
+      '#machine_name' => [
+        'exists' => '\Drupal\opencase_entities\Entity\OCActivityType::load',
+      ],
+      '#disabled' => !$oc_activity_type->isNew(),
+    ];
+
+    /* You will need additional form elements for your custom properties. */
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function save(array $form, FormStateInterface $form_state) {
+    $oc_activity_type = $this->entity;
+    $status = $oc_activity_type->save();
+
+    switch ($status) {
+      case SAVED_NEW:
+        drupal_set_message($this->t('Created the %label Activity type.', [
+          '%label' => $oc_activity_type->label(),
+        ]));
+        break;
+
+      default:
+        drupal_set_message($this->t('Saved the %label Activity type.', [
+          '%label' => $oc_activity_type->label(),
+        ]));
+    }
+    $form_state->setRedirectUrl($oc_activity_type->toUrl('collection'));
+  }
+
+}

modules/opencase_entities/src/Form/OCActorDeleteForm.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Entity\ContentEntityDeleteForm;
+
+/**
+ * Provides a form for deleting Actor entities.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActorDeleteForm extends ContentEntityDeleteForm {
+
+
+}

modules/opencase_entities/src/Form/OCActorForm.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Entity\ContentEntityForm;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Form controller for Actor edit forms.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActorForm extends ContentEntityForm {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    /* @var $entity \Drupal\opencase_entities\Entity\OCActor */
+    $form = parent::buildForm($form, $form_state);
+
+    if (!$this->entity->isNew()) {
+      $form['new_revision'] = [
+        '#type' => 'checkbox',
+        '#title' => $this->t('Create new revision'),
+        '#default_value' => FALSE,
+        '#weight' => 10,
+      ];
+    }
+
+    $entity = $this->entity;
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function save(array $form, FormStateInterface $form_state) {
+    $entity = $this->entity;
+
+    // Save as a new revision if requested to do so.
+    if (!$form_state->isValueEmpty('new_revision') && $form_state->getValue('new_revision') != FALSE) {
+      $entity->setNewRevision();
+
+      // If a new revision is created, save the current user as revision author.
+      $entity->setRevisionCreationTime(REQUEST_TIME);
+      $entity->setRevisionUserId(\Drupal::currentUser()->id());
+    }
+    else {
+      $entity->setNewRevision(FALSE);
+    }
+
+    $status = parent::save($form, $form_state);
+
+    switch ($status) {
+      case SAVED_NEW:
+        drupal_set_message($this->t('Created the %label Actor.', [
+          '%label' => $entity->label(),
+        ]));
+        break;
+
+      default:
+        drupal_set_message($this->t('Saved the %label Actor.', [
+          '%label' => $entity->label(),
+        ]));
+    }
+    $form_state->setRedirect('entity.oc_actor.canonical', ['oc_actor' => $entity->id()]);
+  }
+
+}

modules/opencase_entities/src/Form/OCActorRevisionDeleteForm.php

@@ -0,0 +1,123 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Database\Connection;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Form\ConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a form for deleting a Actor revision.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActorRevisionDeleteForm extends ConfirmFormBase {
+
+
+  /**
+   * The Actor revision.
+   *
+   * @var \Drupal\opencase_entities\Entity\OCActorInterface
+   */
+  protected $revision;
+
+  /**
+   * The Actor storage.
+   *
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  protected $OCActorStorage;
+
+  /**
+   * The database connection.
+   *
+   * @var \Drupal\Core\Database\Connection
+   */
+  protected $connection;
+
+  /**
+   * Constructs a new OCActorRevisionDeleteForm.
+   *
+   * @param \Drupal\Core\Entity\EntityStorageInterface $entity_storage
+   *   The entity storage.
+   * @param \Drupal\Core\Database\Connection $connection
+   *   The database connection.
+   */
+  public function __construct(EntityStorageInterface $entity_storage, Connection $connection) {
+    $this->OCActorStorage = $entity_storage;
+    $this->connection = $connection;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    $entity_manager = $container->get('entity.manager');
+    return new static(
+      $entity_manager->getStorage('oc_actor'),
+      $container->get('database')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'oc_actor_revision_delete_confirm';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return t('Are you sure you want to delete the revision from %revision-date?', ['%revision-date' => format_date($this->revision->getRevisionCreationTime())]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCancelUrl() {
+    return new Url('entity.oc_actor.version_history', ['oc_actor' => $this->revision->id()]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfirmText() {
+    return t('Delete');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $oc_actor_revision = NULL) {
+    $this->revision = $this->OCActorStorage->loadRevision($oc_actor_revision);
+    $form = parent::buildForm($form, $form_state);
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $this->OCActorStorage->deleteRevision($this->revision->getRevisionId());
+
+    $this->logger('content')->notice('Actor: deleted %title revision %revision.', ['%title' => $this->revision->label(), '%revision' => $this->revision->getRevisionId()]);
+    drupal_set_message(t('Revision from %revision-date of Actor %title has been deleted.', ['%revision-date' => format_date($this->revision->getRevisionCreationTime()), '%title' => $this->revision->label()]));
+    $form_state->setRedirect(
+      'entity.oc_actor.canonical',
+       ['oc_actor' => $this->revision->id()]
+    );
+    if ($this->connection->query('SELECT COUNT(DISTINCT vid) FROM {oc_actor_field_revision} WHERE id = :id', [':id' => $this->revision->id()])->fetchField() > 1) {
+      $form_state->setRedirect(
+        'entity.oc_actor.version_history',
+         ['oc_actor' => $this->revision->id()]
+      );
+    }
+  }
+
+}

modules/opencase_entities/src/Form/OCActorRevisionRevertForm.php

@@ -0,0 +1,149 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Datetime\DateFormatterInterface;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Form\ConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+use Drupal\opencase_entities\Entity\OCActorInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a form for reverting a Actor revision.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActorRevisionRevertForm extends ConfirmFormBase {
+
+
+  /**
+   * The Actor revision.
+   *
+   * @var \Drupal\opencase_entities\Entity\OCActorInterface
+   */
+  protected $revision;
+
+  /**
+   * The Actor storage.
+   *
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  protected $OCActorStorage;
+
+  /**
+   * The date formatter service.
+   *
+   * @var \Drupal\Core\Datetime\DateFormatterInterface
+   */
+  protected $dateFormatter;
+
+  /**
+   * Constructs a new OCActorRevisionRevertForm.
+   *
+   * @param \Drupal\Core\Entity\EntityStorageInterface $entity_storage
+   *   The Actor storage.
+   * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
+   *   The date formatter service.
+   */
+  public function __construct(EntityStorageInterface $entity_storage, DateFormatterInterface $date_formatter) {
+    $this->OCActorStorage = $entity_storage;
+    $this->dateFormatter = $date_formatter;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('entity.manager')->getStorage('oc_actor'),
+      $container->get('date.formatter')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'oc_actor_revision_revert_confirm';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return t('Are you sure you want to revert to the revision from %revision-date?', ['%revision-date' => $this->dateFormatter->format($this->revision->getRevisionCreationTime())]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCancelUrl() {
+    return new Url('entity.oc_actor.version_history', ['oc_actor' => $this->revision->id()]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfirmText() {
+    return t('Revert');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDescription() {
+    return '';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $oc_actor_revision = NULL) {
+    $this->revision = $this->OCActorStorage->loadRevision($oc_actor_revision);
+    $form = parent::buildForm($form, $form_state);
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    // The revision timestamp will be updated when the revision is saved. Keep
+    // the original one for the confirmation message.
+    $original_revision_timestamp = $this->revision->getRevisionCreationTime();
+
+    $this->revision = $this->prepareRevertedRevision($this->revision, $form_state);
+    $this->revision->revision_log = t('Copy of the revision from %date.', ['%date' => $this->dateFormatter->format($original_revision_timestamp)]);
+    $this->revision->save();
+
+    $this->logger('content')->notice('Actor: reverted %title revision %revision.', ['%title' => $this->revision->label(), '%revision' => $this->revision->getRevisionId()]);
+    drupal_set_message(t('Actor %title has been reverted to the revision from %revision-date.', ['%title' => $this->revision->label(), '%revision-date' => $this->dateFormatter->format($original_revision_timestamp)]));
+    $form_state->setRedirect(
+      'entity.oc_actor.version_history',
+      ['oc_actor' => $this->revision->id()]
+    );
+  }
+
+  /**
+   * Prepares a revision to be reverted.
+   *
+   * @param \Drupal\opencase_entities\Entity\OCActorInterface $revision
+   *   The revision to be reverted.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCActorInterface
+   *   The prepared revision ready to be stored.
+   */
+  protected function prepareRevertedRevision(OCActorInterface $revision, FormStateInterface $form_state) {
+    $revision->setNewRevision();
+    $revision->isDefaultRevision(TRUE);
+    $revision->setRevisionCreationTime(REQUEST_TIME);
+
+    return $revision;
+  }
+
+}

modules/opencase_entities/src/Form/OCActorRevisionRevertTranslationForm.php

@@ -0,0 +1,115 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Datetime\DateFormatterInterface;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\opencase_entities\Entity\OCActorInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a form for reverting a Actor revision for a single translation.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActorRevisionRevertTranslationForm extends OCActorRevisionRevertForm {
+
+
+  /**
+   * The language to be reverted.
+   *
+   * @var string
+   */
+  protected $langcode;
+
+  /**
+   * The language manager.
+   *
+   * @var \Drupal\Core\Language\LanguageManagerInterface
+   */
+  protected $languageManager;
+
+  /**
+   * Constructs a new OCActorRevisionRevertTranslationForm.
+   *
+   * @param \Drupal\Core\Entity\EntityStorageInterface $entity_storage
+   *   The Actor storage.
+   * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
+   *   The date formatter service.
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   The language manager.
+   */
+  public function __construct(EntityStorageInterface $entity_storage, DateFormatterInterface $date_formatter, LanguageManagerInterface $language_manager) {
+    parent::__construct($entity_storage, $date_formatter);
+    $this->languageManager = $language_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('entity.manager')->getStorage('oc_actor'),
+      $container->get('date.formatter'),
+      $container->get('language_manager')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'oc_actor_revision_revert_translation_confirm';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return t('Are you sure you want to revert @language translation to the revision from %revision-date?', ['@language' => $this->languageManager->getLanguageName($this->langcode), '%revision-date' => $this->dateFormatter->format($this->revision->getRevisionCreationTime())]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $oc_actor_revision = NULL, $langcode = NULL) {
+    $this->langcode = $langcode;
+    $form = parent::buildForm($form, $form_state, $oc_actor_revision);
+
+    $form['revert_untranslated_fields'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Revert content shared among translations'),
+      '#default_value' => FALSE,
+    ];
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function prepareRevertedRevision(OCActorInterface $revision, FormStateInterface $form_state) {
+    $revert_untranslated_fields = $form_state->getValue('revert_untranslated_fields');
+
+    /** @var \Drupal\opencase_entities\Entity\OCActorInterface $default_revision */
+    $latest_revision = $this->OCActorStorage->load($revision->id());
+    $latest_revision_translation = $latest_revision->getTranslation($this->langcode);
+
+    $revision_translation = $revision->getTranslation($this->langcode);
+
+    foreach ($latest_revision_translation->getFieldDefinitions() as $field_name => $definition) {
+      if ($definition->isTranslatable() || $revert_untranslated_fields) {
+        $latest_revision_translation->set($field_name, $revision_translation->get($field_name)->getValue());
+      }
+    }
+
+    $latest_revision_translation->setNewRevision();
+    $latest_revision_translation->isDefaultRevision(TRUE);
+    $revision->setRevisionCreationTime(REQUEST_TIME);
+
+    return $latest_revision_translation;
+  }
+
+}

modules/opencase_entities/src/Form/OCActorSettingsForm.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Class OCActorSettingsForm.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActorSettingsForm extends FormBase {
+
+  /**
+   * Returns a unique string identifying the form.
+   *
+   * @return string
+   *   The unique string identifying the form.
+   */
+  public function getFormId() {
+    return 'ocactor_settings';
+  }
+
+  /**
+   * Form submission handler.
+   *
+   * @param array $form
+   *   An associative array containing the structure of the form.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    // Empty implementation of the abstract submit class.
+  }
+
+  /**
+   * Defines the settings form for Actor entities.
+   *
+   * @param array $form
+   *   An associative array containing the structure of the form.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   *
+   * @return array
+   *   Form definition array.
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $form['ocactor_settings']['#markup'] = 'Settings form for Actor entities. Manage field settings here.';
+    return $form;
+  }
+
+}

modules/opencase_entities/src/Form/OCActorTypeDeleteForm.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Entity\EntityConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+
+/**
+ * Builds the form to delete Actor type entities.
+ */
+class OCActorTypeDeleteForm extends EntityConfirmFormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return $this->t('Are you sure you want to delete %name?', ['%name' => $this->entity->label()]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCancelUrl() {
+    return new Url('entity.oc_actor_type.collection');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfirmText() {
+    return $this->t('Delete');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $this->entity->delete();
+
+    drupal_set_message(
+      $this->t('content @type: deleted @label.',
+        [
+          '@type' => $this->entity->bundle(),
+          '@label' => $this->entity->label(),
+        ]
+        )
+    );
+
+    $form_state->setRedirectUrl($this->getCancelUrl());
+  }
+
+}

modules/opencase_entities/src/Form/OCActorTypeForm.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Entity\EntityForm;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Class OCActorTypeForm.
+ */
+class OCActorTypeForm extends EntityForm {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function form(array $form, FormStateInterface $form_state) {
+    $form = parent::form($form, $form_state);
+
+    $oc_actor_type = $this->entity;
+    $form['label'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Label'),
+      '#maxlength' => 255,
+      '#default_value' => $oc_actor_type->label(),
+      '#description' => $this->t("Label for the Actor type."),
+      '#required' => TRUE,
+    ];
+
+    $form['id'] = [
+      '#type' => 'machine_name',
+      '#default_value' => $oc_actor_type->id(),
+      '#machine_name' => [
+        'exists' => '\Drupal\opencase_entities\Entity\OCActorType::load',
+      ],
+      '#disabled' => !$oc_actor_type->isNew(),
+    ];
+
+    /* You will need additional form elements for your custom properties. */
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function save(array $form, FormStateInterface $form_state) {
+    $oc_actor_type = $this->entity;
+    $status = $oc_actor_type->save();
+
+    switch ($status) {
+      case SAVED_NEW:
+        drupal_set_message($this->t('Created the %label Actor type.', [
+          '%label' => $oc_actor_type->label(),
+        ]));
+        break;
+
+      default:
+        drupal_set_message($this->t('Saved the %label Actor type.', [
+          '%label' => $oc_actor_type->label(),
+        ]));
+    }
+    $form_state->setRedirectUrl($oc_actor_type->toUrl('collection'));
+  }
+
+}

modules/opencase_entities/src/Form/OCCaseDeleteForm.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Entity\ContentEntityDeleteForm;
+
+/**
+ * Provides a form for deleting Case entities.
+ *
+ * @ingroup opencase_entities
+ */
+class OCCaseDeleteForm extends ContentEntityDeleteForm {
+
+
+}

modules/opencase_entities/src/Form/OCCaseForm.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Entity\ContentEntityForm;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Form controller for Case edit forms.
+ *
+ * @ingroup opencase_entities
+ */
+class OCCaseForm extends ContentEntityForm {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    /* @var $entity \Drupal\opencase_entities\Entity\OCCase */
+    $form = parent::buildForm($form, $form_state);
+
+    if (!$this->entity->isNew()) {
+      $form['new_revision'] = [
+        '#type' => 'checkbox',
+        '#title' => $this->t('Create new revision'),
+        '#default_value' => FALSE,
+        '#weight' => 10,
+      ];
+    }
+
+    $entity = $this->entity;
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function save(array $form, FormStateInterface $form_state) {
+    $entity = $this->entity;
+
+    // Save as a new revision if requested to do so.
+    if (!$form_state->isValueEmpty('new_revision') && $form_state->getValue('new_revision') != FALSE) {
+      $entity->setNewRevision();
+
+      // If a new revision is created, save the current user as revision author.
+      $entity->setRevisionCreationTime(REQUEST_TIME);
+      $entity->setRevisionUserId(\Drupal::currentUser()->id());
+    }
+    else {
+      $entity->setNewRevision(FALSE);
+    }
+
+    $status = parent::save($form, $form_state);
+
+    switch ($status) {
+      case SAVED_NEW:
+        drupal_set_message($this->t('Created the %label Case.', [
+          '%label' => $entity->label(),
+        ]));
+        break;
+
+      default:
+        drupal_set_message($this->t('Saved the %label Case.', [
+          '%label' => $entity->label(),
+        ]));
+    }
+    $form_state->setRedirect('entity.oc_case.canonical', ['oc_case' => $entity->id()]);
+  }
+
+}

modules/opencase_entities/src/Form/OCCaseRevisionDeleteForm.php

@@ -0,0 +1,123 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Database\Connection;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Form\ConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a form for deleting a Case revision.
+ *
+ * @ingroup opencase_entities
+ */
+class OCCaseRevisionDeleteForm extends ConfirmFormBase {
+
+
+  /**
+   * The Case revision.
+   *
+   * @var \Drupal\opencase_entities\Entity\OCCaseInterface
+   */
+  protected $revision;
+
+  /**
+   * The Case storage.
+   *
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  protected $OCCaseStorage;
+
+  /**
+   * The database connection.
+   *
+   * @var \Drupal\Core\Database\Connection
+   */
+  protected $connection;
+
+  /**
+   * Constructs a new OCCaseRevisionDeleteForm.
+   *
+   * @param \Drupal\Core\Entity\EntityStorageInterface $entity_storage
+   *   The entity storage.
+   * @param \Drupal\Core\Database\Connection $connection
+   *   The database connection.
+   */
+  public function __construct(EntityStorageInterface $entity_storage, Connection $connection) {
+    $this->OCCaseStorage = $entity_storage;
+    $this->connection = $connection;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    $entity_manager = $container->get('entity.manager');
+    return new static(
+      $entity_manager->getStorage('oc_case'),
+      $container->get('database')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'oc_case_revision_delete_confirm';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return t('Are you sure you want to delete the revision from %revision-date?', ['%revision-date' => format_date($this->revision->getRevisionCreationTime())]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCancelUrl() {
+    return new Url('entity.oc_case.version_history', ['oc_case' => $this->revision->id()]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfirmText() {
+    return t('Delete');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $oc_case_revision = NULL) {
+    $this->revision = $this->OCCaseStorage->loadRevision($oc_case_revision);
+    $form = parent::buildForm($form, $form_state);
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $this->OCCaseStorage->deleteRevision($this->revision->getRevisionId());
+
+    $this->logger('content')->notice('Case: deleted %title revision %revision.', ['%title' => $this->revision->label(), '%revision' => $this->revision->getRevisionId()]);
+    drupal_set_message(t('Revision from %revision-date of Case %title has been deleted.', ['%revision-date' => format_date($this->revision->getRevisionCreationTime()), '%title' => $this->revision->label()]));
+    $form_state->setRedirect(
+      'entity.oc_case.canonical',
+       ['oc_case' => $this->revision->id()]
+    );
+    if ($this->connection->query('SELECT COUNT(DISTINCT vid) FROM {oc_case_field_revision} WHERE id = :id', [':id' => $this->revision->id()])->fetchField() > 1) {
+      $form_state->setRedirect(
+        'entity.oc_case.version_history',
+         ['oc_case' => $this->revision->id()]
+      );
+    }
+  }
+
+}

modules/opencase_entities/src/Form/OCCaseRevisionRevertForm.php

@@ -0,0 +1,149 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Datetime\DateFormatterInterface;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Form\ConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+use Drupal\opencase_entities\Entity\OCCaseInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a form for reverting a Case revision.
+ *
+ * @ingroup opencase_entities
+ */
+class OCCaseRevisionRevertForm extends ConfirmFormBase {
+
+
+  /**
+   * The Case revision.
+   *
+   * @var \Drupal\opencase_entities\Entity\OCCaseInterface
+   */
+  protected $revision;
+
+  /**
+   * The Case storage.
+   *
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  protected $OCCaseStorage;
+
+  /**
+   * The date formatter service.
+   *
+   * @var \Drupal\Core\Datetime\DateFormatterInterface
+   */
+  protected $dateFormatter;
+
+  /**
+   * Constructs a new OCCaseRevisionRevertForm.
+   *
+   * @param \Drupal\Core\Entity\EntityStorageInterface $entity_storage
+   *   The Case storage.
+   * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
+   *   The date formatter service.
+   */
+  public function __construct(EntityStorageInterface $entity_storage, DateFormatterInterface $date_formatter) {
+    $this->OCCaseStorage = $entity_storage;
+    $this->dateFormatter = $date_formatter;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('entity.manager')->getStorage('oc_case'),
+      $container->get('date.formatter')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'oc_case_revision_revert_confirm';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return t('Are you sure you want to revert to the revision from %revision-date?', ['%revision-date' => $this->dateFormatter->format($this->revision->getRevisionCreationTime())]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCancelUrl() {
+    return new Url('entity.oc_case.version_history', ['oc_case' => $this->revision->id()]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfirmText() {
+    return t('Revert');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDescription() {
+    return '';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $oc_case_revision = NULL) {
+    $this->revision = $this->OCCaseStorage->loadRevision($oc_case_revision);
+    $form = parent::buildForm($form, $form_state);
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    // The revision timestamp will be updated when the revision is saved. Keep
+    // the original one for the confirmation message.
+    $original_revision_timestamp = $this->revision->getRevisionCreationTime();
+
+    $this->revision = $this->prepareRevertedRevision($this->revision, $form_state);
+    $this->revision->revision_log = t('Copy of the revision from %date.', ['%date' => $this->dateFormatter->format($original_revision_timestamp)]);
+    $this->revision->save();
+
+    $this->logger('content')->notice('Case: reverted %title revision %revision.', ['%title' => $this->revision->label(), '%revision' => $this->revision->getRevisionId()]);
+    drupal_set_message(t('Case %title has been reverted to the revision from %revision-date.', ['%title' => $this->revision->label(), '%revision-date' => $this->dateFormatter->format($original_revision_timestamp)]));
+    $form_state->setRedirect(
+      'entity.oc_case.version_history',
+      ['oc_case' => $this->revision->id()]
+    );
+  }
+
+  /**
+   * Prepares a revision to be reverted.
+   *
+   * @param \Drupal\opencase_entities\Entity\OCCaseInterface $revision
+   *   The revision to be reverted.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   *
+   * @return \Drupal\opencase_entities\Entity\OCCaseInterface
+   *   The prepared revision ready to be stored.
+   */
+  protected function prepareRevertedRevision(OCCaseInterface $revision, FormStateInterface $form_state) {
+    $revision->setNewRevision();
+    $revision->isDefaultRevision(TRUE);
+    $revision->setRevisionCreationTime(REQUEST_TIME);
+
+    return $revision;
+  }
+
+}

modules/opencase_entities/src/Form/OCCaseRevisionRevertTranslationForm.php

@@ -0,0 +1,115 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Datetime\DateFormatterInterface;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\opencase_entities\Entity\OCCaseInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a form for reverting a Case revision for a single translation.
+ *
+ * @ingroup opencase_entities
+ */
+class OCCaseRevisionRevertTranslationForm extends OCCaseRevisionRevertForm {
+
+
+  /**
+   * The language to be reverted.
+   *
+   * @var string
+   */
+  protected $langcode;
+
+  /**
+   * The language manager.
+   *
+   * @var \Drupal\Core\Language\LanguageManagerInterface
+   */
+  protected $languageManager;
+
+  /**
+   * Constructs a new OCCaseRevisionRevertTranslationForm.
+   *
+   * @param \Drupal\Core\Entity\EntityStorageInterface $entity_storage
+   *   The Case storage.
+   * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
+   *   The date formatter service.
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   The language manager.
+   */
+  public function __construct(EntityStorageInterface $entity_storage, DateFormatterInterface $date_formatter, LanguageManagerInterface $language_manager) {
+    parent::__construct($entity_storage, $date_formatter);
+    $this->languageManager = $language_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('entity.manager')->getStorage('oc_case'),
+      $container->get('date.formatter'),
+      $container->get('language_manager')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'oc_case_revision_revert_translation_confirm';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return t('Are you sure you want to revert @language translation to the revision from %revision-date?', ['@language' => $this->languageManager->getLanguageName($this->langcode), '%revision-date' => $this->dateFormatter->format($this->revision->getRevisionCreationTime())]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $oc_case_revision = NULL, $langcode = NULL) {
+    $this->langcode = $langcode;
+    $form = parent::buildForm($form, $form_state, $oc_case_revision);
+
+    $form['revert_untranslated_fields'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Revert content shared among translations'),
+      '#default_value' => FALSE,
+    ];
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function prepareRevertedRevision(OCCaseInterface $revision, FormStateInterface $form_state) {
+    $revert_untranslated_fields = $form_state->getValue('revert_untranslated_fields');
+
+    /** @var \Drupal\opencase_entities\Entity\OCCaseInterface $default_revision */
+    $latest_revision = $this->OCCaseStorage->load($revision->id());
+    $latest_revision_translation = $latest_revision->getTranslation($this->langcode);
+
+    $revision_translation = $revision->getTranslation($this->langcode);
+
+    foreach ($latest_revision_translation->getFieldDefinitions() as $field_name => $definition) {
+      if ($definition->isTranslatable() || $revert_untranslated_fields) {
+        $latest_revision_translation->set($field_name, $revision_translation->get($field_name)->getValue());
+      }
+    }
+
+    $latest_revision_translation->setNewRevision();
+    $latest_revision_translation->isDefaultRevision(TRUE);
+    $revision->setRevisionCreationTime(REQUEST_TIME);
+
+    return $latest_revision_translation;
+  }
+
+}

modules/opencase_entities/src/Form/OCCaseSettingsForm.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Class OCCaseSettingsForm.
+ *
+ * @ingroup opencase_entities
+ */
+class OCCaseSettingsForm extends FormBase {
+
+  /**
+   * Returns a unique string identifying the form.
+   *
+   * @return string
+   *   The unique string identifying the form.
+   */
+  public function getFormId() {
+    return 'occase_settings';
+  }
+
+  /**
+   * Form submission handler.
+   *
+   * @param array $form
+   *   An associative array containing the structure of the form.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    // Empty implementation of the abstract submit class.
+  }
+
+  /**
+   * Defines the settings form for Case entities.
+   *
+   * @param array $form
+   *   An associative array containing the structure of the form.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   *
+   * @return array
+   *   Form definition array.
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $form['occase_settings']['#markup'] = 'Settings form for Case entities. Manage field settings here.';
+    return $form;
+  }
+
+}

modules/opencase_entities/src/Form/OCCaseTypeDeleteForm.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Entity\EntityConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+
+/**
+ * Builds the form to delete Case type entities.
+ */
+class OCCaseTypeDeleteForm extends EntityConfirmFormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return $this->t('Are you sure you want to delete %name?', ['%name' => $this->entity->label()]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCancelUrl() {
+    return new Url('entity.oc_case_type.collection');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfirmText() {
+    return $this->t('Delete');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $this->entity->delete();
+
+    drupal_set_message(
+      $this->t('content @type: deleted @label.',
+        [
+          '@type' => $this->entity->bundle(),
+          '@label' => $this->entity->label(),
+        ]
+        )
+    );
+
+    $form_state->setRedirectUrl($this->getCancelUrl());
+  }
+
+}

modules/opencase_entities/src/Form/OCCaseTypeForm.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace Drupal\opencase_entities\Form;
+
+use Drupal\Core\Entity\EntityForm;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Class OCCaseTypeForm.
+ */
+class OCCaseTypeForm extends EntityForm {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function form(array $form, FormStateInterface $form_state) {
+    $form = parent::form($form, $form_state);
+
+    $oc_case_type = $this->entity;
+    $form['label'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Label'),
+      '#maxlength' => 255,
+      '#default_value' => $oc_case_type->label(),
+      '#description' => $this->t("Label for the Case type."),
+      '#required' => TRUE,
+    ];
+
+    $form['id'] = [
+      '#type' => 'machine_name',
+      '#default_value' => $oc_case_type->id(),
+      '#machine_name' => [
+        'exists' => '\Drupal\opencase_entities\Entity\OCCaseType::load',
+      ],
+      '#disabled' => !$oc_case_type->isNew(),
+    ];
+
+    /* You will need additional form elements for your custom properties. */
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function save(array $form, FormStateInterface $form_state) {
+    $oc_case_type = $this->entity;
+    $status = $oc_case_type->save();
+
+    switch ($status) {
+      case SAVED_NEW:
+        drupal_set_message($this->t('Created the %label Case type.', [
+          '%label' => $oc_case_type->label(),
+        ]));
+        break;
+
+      default:
+        drupal_set_message($this->t('Saved the %label Case type.', [
+          '%label' => $oc_case_type->label(),
+        ]));
+    }
+    $form_state->setRedirectUrl($oc_case_type->toUrl('collection'));
+  }
+
+}

modules/opencase_entities/src/OCActivityAccessControlHandler.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\EntityAccessControlHandler;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Access\AccessResult;
+
+/**
+ * Access controller for the Activity entity.
+ *
+ * @see \Drupal\opencase_entities\Entity\OCActivity.
+ */
+class OCActivityAccessControlHandler extends EntityAccessControlHandler {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function checkAccess(EntityInterface $entity, $operation, AccountInterface $account) {
+    /** @var \Drupal\opencase_entities\Entity\OCActivityInterface $entity */
+    switch ($operation) {
+      case 'view':
+        if (!$entity->isPublished()) {
+          return AccessResult::allowedIfHasPermission($account, 'view unpublished activity entities');
+        }
+        return AccessResult::allowedIfHasPermission($account, 'view published activity entities');
+
+      case 'update':
+        return AccessResult::allowedIfHasPermission($account, 'edit activity entities');
+
+      case 'delete':
+        return AccessResult::allowedIfHasPermission($account, 'delete activity entities');
+    }
+
+    // Unknown operation, no opinion.
+    return AccessResult::neutral();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function checkCreateAccess(AccountInterface $account, array $context, $entity_bundle = NULL) {
+    return AccessResult::allowedIfHasPermission($account, 'add activity entities');
+  }
+
+}

modules/opencase_entities/src/OCActivityHtmlRouteProvider.php

@@ -0,0 +1,196 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Entity\Routing\AdminHtmlRouteProvider;
+use Symfony\Component\Routing\Route;
+
+/**
+ * Provides routes for Activity entities.
+ *
+ * @see \Drupal\Core\Entity\Routing\AdminHtmlRouteProvider
+ * @see \Drupal\Core\Entity\Routing\DefaultHtmlRouteProvider
+ */
+class OCActivityHtmlRouteProvider extends AdminHtmlRouteProvider {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getRoutes(EntityTypeInterface $entity_type) {
+    $collection = parent::getRoutes($entity_type);
+
+    $entity_type_id = $entity_type->id();
+
+    if ($history_route = $this->getHistoryRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.version_history", $history_route);
+    }
+
+    if ($revision_route = $this->getRevisionRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.revision", $revision_route);
+    }
+
+    if ($revert_route = $this->getRevisionRevertRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.revision_revert", $revert_route);
+    }
+
+    if ($delete_route = $this->getRevisionDeleteRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.revision_delete", $delete_route);
+    }
+
+    if ($translation_route = $this->getRevisionTranslationRevertRoute($entity_type)) {
+      $collection->add("{$entity_type_id}.revision_revert_translation_confirm", $translation_route);
+    }
+
+    if ($settings_form_route = $this->getSettingsFormRoute($entity_type)) {
+      $collection->add("$entity_type_id.settings", $settings_form_route);
+    }
+
+    return $collection;
+  }
+
+  /**
+   * Gets the version history route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getHistoryRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('version-history')) {
+      $route = new Route($entity_type->getLinkTemplate('version-history'));
+      $route
+        ->setDefaults([
+          '_title' => "{$entity_type->getLabel()} revisions",
+          '_controller' => '\Drupal\opencase_entities\Controller\OCActivityController::revisionOverview',
+        ])
+        ->setRequirement('_permission', 'access activity revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('revision')) {
+      $route = new Route($entity_type->getLinkTemplate('revision'));
+      $route
+        ->setDefaults([
+          '_controller' => '\Drupal\opencase_entities\Controller\OCActivityController::revisionShow',
+          '_title_callback' => '\Drupal\opencase_entities\Controller\OCActivityController::revisionPageTitle',
+        ])
+        ->setRequirement('_permission', 'access activity revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision revert route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionRevertRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('revision_revert')) {
+      $route = new Route($entity_type->getLinkTemplate('revision_revert'));
+      $route
+        ->setDefaults([
+          '_form' => '\Drupal\opencase_entities\Form\OCActivityRevisionRevertForm',
+          '_title' => 'Revert to earlier revision',
+        ])
+        ->setRequirement('_permission', 'revert all activity revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision delete route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionDeleteRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('revision_delete')) {
+      $route = new Route($entity_type->getLinkTemplate('revision_delete'));
+      $route
+        ->setDefaults([
+          '_form' => '\Drupal\opencase_entities\Form\OCActivityRevisionDeleteForm',
+          '_title' => 'Delete earlier revision',
+        ])
+        ->setRequirement('_permission', 'delete all activity revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision translation revert route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionTranslationRevertRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('translation_revert')) {
+      $route = new Route($entity_type->getLinkTemplate('translation_revert'));
+      $route
+        ->setDefaults([
+          '_form' => '\Drupal\opencase_entities\Form\OCActivityRevisionRevertTranslationForm',
+          '_title' => 'Revert to earlier revision of a translation',
+        ])
+        ->setRequirement('_permission', 'revert all activity revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the settings form route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getSettingsFormRoute(EntityTypeInterface $entity_type) {
+    if (!$entity_type->getBundleEntityType()) {
+      $route = new Route("/admin/structure/{$entity_type->id()}/settings");
+      $route
+        ->setDefaults([
+          '_form' => 'Drupal\opencase_entities\Form\OCActivitySettingsForm',
+          '_title' => "{$entity_type->getLabel()} settings",
+        ])
+        ->setRequirement('_permission', $entity_type->getAdminPermission())
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+}

modules/opencase_entities/src/OCActivityListBuilder.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\EntityListBuilder;
+use Drupal\Core\Link;
+
+/**
+ * Defines a class to build a listing of Activity entities.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActivityListBuilder extends EntityListBuilder {
+
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildHeader() {
+    $header['id'] = $this->t('Activity ID');
+    $header['name'] = $this->t('Name');
+    return $header + parent::buildHeader();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildRow(EntityInterface $entity) {
+    /* @var $entity \Drupal\opencase_entities\Entity\OCActivity */
+    $row['id'] = $entity->id();
+    $row['name'] = Link::createFromRoute(
+      $entity->label(),
+      'entity.oc_activity.edit_form',
+      ['oc_activity' => $entity->id()]
+    );
+    return $row + parent::buildRow($entity);
+  }
+
+}

modules/opencase_entities/src/OCActivityStorage.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\Sql\SqlContentEntityStorage;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\opencase_entities\Entity\OCActivityInterface;
+
+/**
+ * Defines the storage handler class for Activity entities.
+ *
+ * This extends the base storage class, adding required special handling for
+ * Activity entities.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActivityStorage extends SqlContentEntityStorage implements OCActivityStorageInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function revisionIds(OCActivityInterface $entity) {
+    return $this->database->query(
+      'SELECT vid FROM {oc_activity_revision} WHERE id=:id ORDER BY vid',
+      [':id' => $entity->id()]
+    )->fetchCol();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function userRevisionIds(AccountInterface $account) {
+    return $this->database->query(
+      'SELECT vid FROM {oc_activity_field_revision} WHERE uid = :uid ORDER BY vid',
+      [':uid' => $account->id()]
+    )->fetchCol();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function countDefaultLanguageRevisions(OCActivityInterface $entity) {
+    return $this->database->query('SELECT COUNT(*) FROM {oc_activity_field_revision} WHERE id = :id AND default_langcode = 1', [':id' => $entity->id()])
+      ->fetchField();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function clearRevisionsLanguage(LanguageInterface $language) {
+    return $this->database->update('oc_activity_revision')
+      ->fields(['langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED])
+      ->condition('langcode', $language->getId())
+      ->execute();
+  }
+
+}

modules/opencase_entities/src/OCActivityStorageInterface.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\ContentEntityStorageInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\opencase_entities\Entity\OCActivityInterface;
+
+/**
+ * Defines the storage handler class for Activity entities.
+ *
+ * This extends the base storage class, adding required special handling for
+ * Activity entities.
+ *
+ * @ingroup opencase_entities
+ */
+interface OCActivityStorageInterface extends ContentEntityStorageInterface {
+
+  /**
+   * Gets a list of Activity revision IDs for a specific Activity.
+   *
+   * @param \Drupal\opencase_entities\Entity\OCActivityInterface $entity
+   *   The Activity entity.
+   *
+   * @return int[]
+   *   Activity revision IDs (in ascending order).
+   */
+  public function revisionIds(OCActivityInterface $entity);
+
+  /**
+   * Gets a list of revision IDs having a given user as Activity author.
+   *
+   * @param \Drupal\Core\Session\AccountInterface $account
+   *   The user entity.
+   *
+   * @return int[]
+   *   Activity revision IDs (in ascending order).
+   */
+  public function userRevisionIds(AccountInterface $account);
+
+  /**
+   * Counts the number of revisions in the default language.
+   *
+   * @param \Drupal\opencase_entities\Entity\OCActivityInterface $entity
+   *   The Activity entity.
+   *
+   * @return int
+   *   The number of revisions in the default language.
+   */
+  public function countDefaultLanguageRevisions(OCActivityInterface $entity);
+
+  /**
+   * Unsets the language for all Activity with the given language.
+   *
+   * @param \Drupal\Core\Language\LanguageInterface $language
+   *   The language object.
+   */
+  public function clearRevisionsLanguage(LanguageInterface $language);
+
+}

modules/opencase_entities/src/OCActivityTranslationHandler.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\content_translation\ContentTranslationHandler;
+
+/**
+ * Defines the translation handler for oc_activity.
+ */
+class OCActivityTranslationHandler extends ContentTranslationHandler {
+
+  // Override here the needed methods from ContentTranslationHandler.
+
+}

modules/opencase_entities/src/OCActivityTypeHtmlRouteProvider.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Entity\Routing\AdminHtmlRouteProvider;
+use Symfony\Component\Routing\Route;
+
+/**
+ * Provides routes for Activity type entities.
+ *
+ * @see Drupal\Core\Entity\Routing\AdminHtmlRouteProvider
+ * @see Drupal\Core\Entity\Routing\DefaultHtmlRouteProvider
+ */
+class OCActivityTypeHtmlRouteProvider extends AdminHtmlRouteProvider {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getRoutes(EntityTypeInterface $entity_type) {
+    $collection = parent::getRoutes($entity_type);
+
+    // Provide your custom entity routes here.
+
+    return $collection;
+  }
+
+}

modules/opencase_entities/src/OCActivityTypeListBuilder.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Config\Entity\ConfigEntityListBuilder;
+use Drupal\Core\Entity\EntityInterface;
+
+/**
+ * Provides a listing of Activity type entities.
+ */
+class OCActivityTypeListBuilder extends ConfigEntityListBuilder {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildHeader() {
+    $header['label'] = $this->t('Activity type');
+    $header['id'] = $this->t('Machine name');
+    return $header + parent::buildHeader();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildRow(EntityInterface $entity) {
+    $row['label'] = $entity->label();
+    $row['id'] = $entity->id();
+    // You probably want a few more properties here...
+    return $row + parent::buildRow($entity);
+  }
+
+}

modules/opencase_entities/src/OCActorAccessControlHandler.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\EntityAccessControlHandler;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Access\AccessResult;
+
+/**
+ * Access controller for the Actor entity.
+ *
+ * @see \Drupal\opencase_entities\Entity\OCActor.
+ */
+class OCActorAccessControlHandler extends EntityAccessControlHandler {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function checkAccess(EntityInterface $entity, $operation, AccountInterface $account) {
+    /** @var \Drupal\opencase_entities\Entity\OCActorInterface $entity */
+    switch ($operation) {
+      case 'view':
+        if (!$entity->isPublished()) {
+          return AccessResult::allowedIfHasPermission($account, 'view unpublished actor entities');
+        }
+        return AccessResult::allowedIfHasPermission($account, 'view published actor entities');
+
+      case 'update':
+        return AccessResult::allowedIfHasPermission($account, 'edit actor entities');
+
+      case 'delete':
+        return AccessResult::allowedIfHasPermission($account, 'delete actor entities');
+    }
+
+    // Unknown operation, no opinion.
+    return AccessResult::neutral();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function checkCreateAccess(AccountInterface $account, array $context, $entity_bundle = NULL) {
+    return AccessResult::allowedIfHasPermission($account, 'add actor entities');
+  }
+
+}

modules/opencase_entities/src/OCActorHtmlRouteProvider.php

@@ -0,0 +1,196 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Entity\Routing\AdminHtmlRouteProvider;
+use Symfony\Component\Routing\Route;
+
+/**
+ * Provides routes for Actor entities.
+ *
+ * @see \Drupal\Core\Entity\Routing\AdminHtmlRouteProvider
+ * @see \Drupal\Core\Entity\Routing\DefaultHtmlRouteProvider
+ */
+class OCActorHtmlRouteProvider extends AdminHtmlRouteProvider {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getRoutes(EntityTypeInterface $entity_type) {
+    $collection = parent::getRoutes($entity_type);
+
+    $entity_type_id = $entity_type->id();
+
+    if ($history_route = $this->getHistoryRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.version_history", $history_route);
+    }
+
+    if ($revision_route = $this->getRevisionRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.revision", $revision_route);
+    }
+
+    if ($revert_route = $this->getRevisionRevertRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.revision_revert", $revert_route);
+    }
+
+    if ($delete_route = $this->getRevisionDeleteRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.revision_delete", $delete_route);
+    }
+
+    if ($translation_route = $this->getRevisionTranslationRevertRoute($entity_type)) {
+      $collection->add("{$entity_type_id}.revision_revert_translation_confirm", $translation_route);
+    }
+
+    if ($settings_form_route = $this->getSettingsFormRoute($entity_type)) {
+      $collection->add("$entity_type_id.settings", $settings_form_route);
+    }
+
+    return $collection;
+  }
+
+  /**
+   * Gets the version history route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getHistoryRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('version-history')) {
+      $route = new Route($entity_type->getLinkTemplate('version-history'));
+      $route
+        ->setDefaults([
+          '_title' => "{$entity_type->getLabel()} revisions",
+          '_controller' => '\Drupal\opencase_entities\Controller\OCActorController::revisionOverview',
+        ])
+        ->setRequirement('_permission', 'access actor revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('revision')) {
+      $route = new Route($entity_type->getLinkTemplate('revision'));
+      $route
+        ->setDefaults([
+          '_controller' => '\Drupal\opencase_entities\Controller\OCActorController::revisionShow',
+          '_title_callback' => '\Drupal\opencase_entities\Controller\OCActorController::revisionPageTitle',
+        ])
+        ->setRequirement('_permission', 'access actor revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision revert route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionRevertRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('revision_revert')) {
+      $route = new Route($entity_type->getLinkTemplate('revision_revert'));
+      $route
+        ->setDefaults([
+          '_form' => '\Drupal\opencase_entities\Form\OCActorRevisionRevertForm',
+          '_title' => 'Revert to earlier revision',
+        ])
+        ->setRequirement('_permission', 'revert all actor revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision delete route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionDeleteRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('revision_delete')) {
+      $route = new Route($entity_type->getLinkTemplate('revision_delete'));
+      $route
+        ->setDefaults([
+          '_form' => '\Drupal\opencase_entities\Form\OCActorRevisionDeleteForm',
+          '_title' => 'Delete earlier revision',
+        ])
+        ->setRequirement('_permission', 'delete all actor revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision translation revert route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionTranslationRevertRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('translation_revert')) {
+      $route = new Route($entity_type->getLinkTemplate('translation_revert'));
+      $route
+        ->setDefaults([
+          '_form' => '\Drupal\opencase_entities\Form\OCActorRevisionRevertTranslationForm',
+          '_title' => 'Revert to earlier revision of a translation',
+        ])
+        ->setRequirement('_permission', 'revert all actor revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the settings form route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getSettingsFormRoute(EntityTypeInterface $entity_type) {
+    if (!$entity_type->getBundleEntityType()) {
+      $route = new Route("/admin/structure/{$entity_type->id()}/settings");
+      $route
+        ->setDefaults([
+          '_form' => 'Drupal\opencase_entities\Form\OCActorSettingsForm',
+          '_title' => "{$entity_type->getLabel()} settings",
+        ])
+        ->setRequirement('_permission', $entity_type->getAdminPermission())
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+}

modules/opencase_entities/src/OCActorListBuilder.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\EntityListBuilder;
+use Drupal\Core\Link;
+
+/**
+ * Defines a class to build a listing of Actor entities.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActorListBuilder extends EntityListBuilder {
+
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildHeader() {
+    $header['id'] = $this->t('Actor ID');
+    $header['name'] = $this->t('Name');
+    return $header + parent::buildHeader();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildRow(EntityInterface $entity) {
+    /* @var $entity \Drupal\opencase_entities\Entity\OCActor */
+    $row['id'] = $entity->id();
+    $row['name'] = Link::createFromRoute(
+      $entity->label(),
+      'entity.oc_actor.edit_form',
+      ['oc_actor' => $entity->id()]
+    );
+    return $row + parent::buildRow($entity);
+  }
+
+}

modules/opencase_entities/src/OCActorStorage.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\Sql\SqlContentEntityStorage;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\opencase_entities\Entity\OCActorInterface;
+
+/**
+ * Defines the storage handler class for Actor entities.
+ *
+ * This extends the base storage class, adding required special handling for
+ * Actor entities.
+ *
+ * @ingroup opencase_entities
+ */
+class OCActorStorage extends SqlContentEntityStorage implements OCActorStorageInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function revisionIds(OCActorInterface $entity) {
+    return $this->database->query(
+      'SELECT vid FROM {oc_actor_revision} WHERE id=:id ORDER BY vid',
+      [':id' => $entity->id()]
+    )->fetchCol();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function userRevisionIds(AccountInterface $account) {
+    return $this->database->query(
+      'SELECT vid FROM {oc_actor_field_revision} WHERE uid = :uid ORDER BY vid',
+      [':uid' => $account->id()]
+    )->fetchCol();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function countDefaultLanguageRevisions(OCActorInterface $entity) {
+    return $this->database->query('SELECT COUNT(*) FROM {oc_actor_field_revision} WHERE id = :id AND default_langcode = 1', [':id' => $entity->id()])
+      ->fetchField();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function clearRevisionsLanguage(LanguageInterface $language) {
+    return $this->database->update('oc_actor_revision')
+      ->fields(['langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED])
+      ->condition('langcode', $language->getId())
+      ->execute();
+  }
+
+}

modules/opencase_entities/src/OCActorStorageInterface.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\ContentEntityStorageInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\opencase_entities\Entity\OCActorInterface;
+
+/**
+ * Defines the storage handler class for Actor entities.
+ *
+ * This extends the base storage class, adding required special handling for
+ * Actor entities.
+ *
+ * @ingroup opencase_entities
+ */
+interface OCActorStorageInterface extends ContentEntityStorageInterface {
+
+  /**
+   * Gets a list of Actor revision IDs for a specific Actor.
+   *
+   * @param \Drupal\opencase_entities\Entity\OCActorInterface $entity
+   *   The Actor entity.
+   *
+   * @return int[]
+   *   Actor revision IDs (in ascending order).
+   */
+  public function revisionIds(OCActorInterface $entity);
+
+  /**
+   * Gets a list of revision IDs having a given user as Actor author.
+   *
+   * @param \Drupal\Core\Session\AccountInterface $account
+   *   The user entity.
+   *
+   * @return int[]
+   *   Actor revision IDs (in ascending order).
+   */
+  public function userRevisionIds(AccountInterface $account);
+
+  /**
+   * Counts the number of revisions in the default language.
+   *
+   * @param \Drupal\opencase_entities\Entity\OCActorInterface $entity
+   *   The Actor entity.
+   *
+   * @return int
+   *   The number of revisions in the default language.
+   */
+  public function countDefaultLanguageRevisions(OCActorInterface $entity);
+
+  /**
+   * Unsets the language for all Actor with the given language.
+   *
+   * @param \Drupal\Core\Language\LanguageInterface $language
+   *   The language object.
+   */
+  public function clearRevisionsLanguage(LanguageInterface $language);
+
+}

modules/opencase_entities/src/OCActorTranslationHandler.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\content_translation\ContentTranslationHandler;
+
+/**
+ * Defines the translation handler for oc_actor.
+ */
+class OCActorTranslationHandler extends ContentTranslationHandler {
+
+  // Override here the needed methods from ContentTranslationHandler.
+
+}

modules/opencase_entities/src/OCActorTypeHtmlRouteProvider.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Entity\Routing\AdminHtmlRouteProvider;
+use Symfony\Component\Routing\Route;
+
+/**
+ * Provides routes for Actor type entities.
+ *
+ * @see Drupal\Core\Entity\Routing\AdminHtmlRouteProvider
+ * @see Drupal\Core\Entity\Routing\DefaultHtmlRouteProvider
+ */
+class OCActorTypeHtmlRouteProvider extends AdminHtmlRouteProvider {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getRoutes(EntityTypeInterface $entity_type) {
+    $collection = parent::getRoutes($entity_type);
+
+    // Provide your custom entity routes here.
+
+    return $collection;
+  }
+
+}

modules/opencase_entities/src/OCActorTypeListBuilder.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Config\Entity\ConfigEntityListBuilder;
+use Drupal\Core\Entity\EntityInterface;
+
+/**
+ * Provides a listing of Actor type entities.
+ */
+class OCActorTypeListBuilder extends ConfigEntityListBuilder {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildHeader() {
+    $header['label'] = $this->t('Actor type');
+    $header['id'] = $this->t('Machine name');
+    return $header + parent::buildHeader();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildRow(EntityInterface $entity) {
+    $row['label'] = $entity->label();
+    $row['id'] = $entity->id();
+    // You probably want a few more properties here...
+    return $row + parent::buildRow($entity);
+  }
+
+}

modules/opencase_entities/src/OCCaseAccessControlHandler.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\EntityAccessControlHandler;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Access\AccessResult;
+
+/**
+ * Access controller for the Case entity.
+ *
+ * @see \Drupal\opencase_entities\Entity\OCCase.
+ */
+class OCCaseAccessControlHandler extends EntityAccessControlHandler {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function checkAccess(EntityInterface $entity, $operation, AccountInterface $account) {
+    /** @var \Drupal\opencase_entities\Entity\OCCaseInterface $entity */
+    switch ($operation) {
+      case 'view':
+        if (!$entity->isPublished()) {
+          return AccessResult::allowedIfHasPermission($account, 'view unpublished case entities');
+        }
+        return AccessResult::allowedIfHasPermission($account, 'view published case entities');
+
+      case 'update':
+        return AccessResult::allowedIfHasPermission($account, 'edit case entities');
+
+      case 'delete':
+        return AccessResult::allowedIfHasPermission($account, 'delete case entities');
+    }
+
+    // Unknown operation, no opinion.
+    return AccessResult::neutral();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function checkCreateAccess(AccountInterface $account, array $context, $entity_bundle = NULL) {
+    return AccessResult::allowedIfHasPermission($account, 'add case entities');
+  }
+
+}

modules/opencase_entities/src/OCCaseHtmlRouteProvider.php

@@ -0,0 +1,196 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Entity\Routing\AdminHtmlRouteProvider;
+use Symfony\Component\Routing\Route;
+
+/**
+ * Provides routes for Case entities.
+ *
+ * @see \Drupal\Core\Entity\Routing\AdminHtmlRouteProvider
+ * @see \Drupal\Core\Entity\Routing\DefaultHtmlRouteProvider
+ */
+class OCCaseHtmlRouteProvider extends AdminHtmlRouteProvider {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getRoutes(EntityTypeInterface $entity_type) {
+    $collection = parent::getRoutes($entity_type);
+
+    $entity_type_id = $entity_type->id();
+
+    if ($history_route = $this->getHistoryRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.version_history", $history_route);
+    }
+
+    if ($revision_route = $this->getRevisionRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.revision", $revision_route);
+    }
+
+    if ($revert_route = $this->getRevisionRevertRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.revision_revert", $revert_route);
+    }
+
+    if ($delete_route = $this->getRevisionDeleteRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.revision_delete", $delete_route);
+    }
+
+    if ($translation_route = $this->getRevisionTranslationRevertRoute($entity_type)) {
+      $collection->add("{$entity_type_id}.revision_revert_translation_confirm", $translation_route);
+    }
+
+    if ($settings_form_route = $this->getSettingsFormRoute($entity_type)) {
+      $collection->add("$entity_type_id.settings", $settings_form_route);
+    }
+
+    return $collection;
+  }
+
+  /**
+   * Gets the version history route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getHistoryRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('version-history')) {
+      $route = new Route($entity_type->getLinkTemplate('version-history'));
+      $route
+        ->setDefaults([
+          '_title' => "{$entity_type->getLabel()} revisions",
+          '_controller' => '\Drupal\opencase_entities\Controller\OCCaseController::revisionOverview',
+        ])
+        ->setRequirement('_permission', 'access case revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('revision')) {
+      $route = new Route($entity_type->getLinkTemplate('revision'));
+      $route
+        ->setDefaults([
+          '_controller' => '\Drupal\opencase_entities\Controller\OCCaseController::revisionShow',
+          '_title_callback' => '\Drupal\opencase_entities\Controller\OCCaseController::revisionPageTitle',
+        ])
+        ->setRequirement('_permission', 'access case revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision revert route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionRevertRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('revision_revert')) {
+      $route = new Route($entity_type->getLinkTemplate('revision_revert'));
+      $route
+        ->setDefaults([
+          '_form' => '\Drupal\opencase_entities\Form\OCCaseRevisionRevertForm',
+          '_title' => 'Revert to earlier revision',
+        ])
+        ->setRequirement('_permission', 'revert all case revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision delete route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionDeleteRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('revision_delete')) {
+      $route = new Route($entity_type->getLinkTemplate('revision_delete'));
+      $route
+        ->setDefaults([
+          '_form' => '\Drupal\opencase_entities\Form\OCCaseRevisionDeleteForm',
+          '_title' => 'Delete earlier revision',
+        ])
+        ->setRequirement('_permission', 'delete all case revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision translation revert route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionTranslationRevertRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('translation_revert')) {
+      $route = new Route($entity_type->getLinkTemplate('translation_revert'));
+      $route
+        ->setDefaults([
+          '_form' => '\Drupal\opencase_entities\Form\OCCaseRevisionRevertTranslationForm',
+          '_title' => 'Revert to earlier revision of a translation',
+        ])
+        ->setRequirement('_permission', 'revert all case revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the settings form route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getSettingsFormRoute(EntityTypeInterface $entity_type) {
+    if (!$entity_type->getBundleEntityType()) {
+      $route = new Route("/admin/structure/{$entity_type->id()}/settings");
+      $route
+        ->setDefaults([
+          '_form' => 'Drupal\opencase_entities\Form\OCCaseSettingsForm',
+          '_title' => "{$entity_type->getLabel()} settings",
+        ])
+        ->setRequirement('_permission', $entity_type->getAdminPermission())
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+}

modules/opencase_entities/src/OCCaseListBuilder.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\EntityListBuilder;
+use Drupal\Core\Link;
+
+/**
+ * Defines a class to build a listing of Case entities.
+ *
+ * @ingroup opencase_entities
+ */
+class OCCaseListBuilder extends EntityListBuilder {
+
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildHeader() {
+    $header['id'] = $this->t('Case ID');
+    $header['name'] = $this->t('Name');
+    return $header + parent::buildHeader();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildRow(EntityInterface $entity) {
+    /* @var $entity \Drupal\opencase_entities\Entity\OCCase */
+    $row['id'] = $entity->id();
+    $row['name'] = Link::createFromRoute(
+      $entity->label(),
+      'entity.oc_case.edit_form',
+      ['oc_case' => $entity->id()]
+    );
+    return $row + parent::buildRow($entity);
+  }
+
+}

modules/opencase_entities/src/OCCaseStorage.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\Sql\SqlContentEntityStorage;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\opencase_entities\Entity\OCCaseInterface;
+
+/**
+ * Defines the storage handler class for Case entities.
+ *
+ * This extends the base storage class, adding required special handling for
+ * Case entities.
+ *
+ * @ingroup opencase_entities
+ */
+class OCCaseStorage extends SqlContentEntityStorage implements OCCaseStorageInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function revisionIds(OCCaseInterface $entity) {
+    return $this->database->query(
+      'SELECT vid FROM {oc_case_revision} WHERE id=:id ORDER BY vid',
+      [':id' => $entity->id()]
+    )->fetchCol();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function userRevisionIds(AccountInterface $account) {
+    return $this->database->query(
+      'SELECT vid FROM {oc_case_field_revision} WHERE uid = :uid ORDER BY vid',
+      [':uid' => $account->id()]
+    )->fetchCol();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function countDefaultLanguageRevisions(OCCaseInterface $entity) {
+    return $this->database->query('SELECT COUNT(*) FROM {oc_case_field_revision} WHERE id = :id AND default_langcode = 1', [':id' => $entity->id()])
+      ->fetchField();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function clearRevisionsLanguage(LanguageInterface $language) {
+    return $this->database->update('oc_case_revision')
+      ->fields(['langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED])
+      ->condition('langcode', $language->getId())
+      ->execute();
+  }
+
+}

modules/opencase_entities/src/OCCaseStorageInterface.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\ContentEntityStorageInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\opencase_entities\Entity\OCCaseInterface;
+
+/**
+ * Defines the storage handler class for Case entities.
+ *
+ * This extends the base storage class, adding required special handling for
+ * Case entities.
+ *
+ * @ingroup opencase_entities
+ */
+interface OCCaseStorageInterface extends ContentEntityStorageInterface {
+
+  /**
+   * Gets a list of Case revision IDs for a specific Case.
+   *
+   * @param \Drupal\opencase_entities\Entity\OCCaseInterface $entity
+   *   The Case entity.
+   *
+   * @return int[]
+   *   Case revision IDs (in ascending order).
+   */
+  public function revisionIds(OCCaseInterface $entity);
+
+  /**
+   * Gets a list of revision IDs having a given user as Case author.
+   *
+   * @param \Drupal\Core\Session\AccountInterface $account
+   *   The user entity.
+   *
+   * @return int[]
+   *   Case revision IDs (in ascending order).
+   */
+  public function userRevisionIds(AccountInterface $account);
+
+  /**
+   * Counts the number of revisions in the default language.
+   *
+   * @param \Drupal\opencase_entities\Entity\OCCaseInterface $entity
+   *   The Case entity.
+   *
+   * @return int
+   *   The number of revisions in the default language.
+   */
+  public function countDefaultLanguageRevisions(OCCaseInterface $entity);
+
+  /**
+   * Unsets the language for all Case with the given language.
+   *
+   * @param \Drupal\Core\Language\LanguageInterface $language
+   *   The language object.
+   */
+  public function clearRevisionsLanguage(LanguageInterface $language);
+
+}

modules/opencase_entities/src/OCCaseTranslationHandler.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\content_translation\ContentTranslationHandler;
+
+/**
+ * Defines the translation handler for oc_case.
+ */
+class OCCaseTranslationHandler extends ContentTranslationHandler {
+
+  // Override here the needed methods from ContentTranslationHandler.
+
+}

modules/opencase_entities/src/OCCaseTypeHtmlRouteProvider.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Entity\Routing\AdminHtmlRouteProvider;
+use Symfony\Component\Routing\Route;
+
+/**
+ * Provides routes for Case type entities.
+ *
+ * @see Drupal\Core\Entity\Routing\AdminHtmlRouteProvider
+ * @see Drupal\Core\Entity\Routing\DefaultHtmlRouteProvider
+ */
+class OCCaseTypeHtmlRouteProvider extends AdminHtmlRouteProvider {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getRoutes(EntityTypeInterface $entity_type) {
+    $collection = parent::getRoutes($entity_type);
+
+    // Provide your custom entity routes here.
+
+    return $collection;
+  }
+
+}

modules/opencase_entities/src/OCCaseTypeListBuilder.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Drupal\opencase_entities;
+
+use Drupal\Core\Config\Entity\ConfigEntityListBuilder;
+use Drupal\Core\Entity\EntityInterface;
+
+/**
+ * Provides a listing of Case type entities.
+ */
+class OCCaseTypeListBuilder extends ConfigEntityListBuilder {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildHeader() {
+    $header['label'] = $this->t('Case type');
+    $header['id'] = $this->t('Machine name');
+    return $header + parent::buildHeader();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildRow(EntityInterface $entity) {
+    $row['label'] = $entity->label();
+    $row['id'] = $entity->id();
+    // You probably want a few more properties here...
+    return $row + parent::buildRow($entity);
+  }
+
+}

modules/opencase_entities/templates/oc-activity-content-add-list.html.twig

@@ -0,0 +1,23 @@
+{#
+/**
+ * @file
+ * Default theme implementation to present a list of custom content entity types/bundles.
+ *
+ * Available variables:
+ * - types: A collection of all the available custom entity types/bundles.
+ *   Each type/bundle contains the following:
+ *   - link: A link to add a content entity of this type.
+ *   - description: A description of this content entity types/bundle.
+ *
+ * @see template_preprocess_oc_activity_content_add_list()
+ *
+ * @ingroup themeable
+ */
+#}
+{% spaceless %}
+  <dl>
+    {% for type in types %}
+      <dt>{{ type.link }}</dt>
+    {% endfor %}
+  </dl>
+{% endspaceless %}

modules/opencase_entities/templates/oc-actor-content-add-list.html.twig

@@ -0,0 +1,23 @@
+{#
+/**
+ * @file
+ * Default theme implementation to present a list of custom content entity types/bundles.
+ *
+ * Available variables:
+ * - types: A collection of all the available custom entity types/bundles.
+ *   Each type/bundle contains the following:
+ *   - link: A link to add a content entity of this type.
+ *   - description: A description of this content entity types/bundle.
+ *
+ * @see template_preprocess_oc_actor_content_add_list()
+ *
+ * @ingroup themeable
+ */
+#}
+{% spaceless %}
+  <dl>
+    {% for type in types %}
+      <dt>{{ type.link }}</dt>
+    {% endfor %}
+  </dl>
+{% endspaceless %}

modules/opencase_entities/templates/oc-case-content-add-list.html.twig

@@ -0,0 +1,23 @@
+{#
+/**
+ * @file
+ * Default theme implementation to present a list of custom content entity types/bundles.
+ *
+ * Available variables:
+ * - types: A collection of all the available custom entity types/bundles.
+ *   Each type/bundle contains the following:
+ *   - link: A link to add a content entity of this type.
+ *   - description: A description of this content entity types/bundle.
+ *
+ * @see template_preprocess_oc_case_content_add_list()
+ *
+ * @ingroup themeable
+ */
+#}
+{% spaceless %}
+  <dl>
+    {% for type in types %}
+      <dt>{{ type.link }}</dt>
+    {% endfor %}
+  </dl>
+{% endspaceless %}

modules/opencase_entities/templates/oc_activity.html.twig

@@ -0,0 +1,22 @@
+{#
+/**
+ * @file oc_activity.html.twig
+ * Default theme implementation to present Activity data.
+ *
+ * This template is used when viewing Activity pages.
+ *
+ *
+ * Available variables:
+ * - content: A list of content items. Use 'content' to print all content, or
+ * - attributes: HTML attributes for the container element.
+ *
+ * @see template_preprocess_oc_activity()
+ *
+ * @ingroup themeable
+ */
+#}
+<div{{ attributes.addClass('oc_activity') }}>
+  {% if content %}
+    {{- content -}}
+  {% endif %}
+</div>

modules/opencase_entities/templates/oc_actor.html.twig

@@ -0,0 +1,22 @@
+{#
+/**
+ * @file oc_actor.html.twig
+ * Default theme implementation to present Actor data.
+ *
+ * This template is used when viewing Actor pages.
+ *
+ *
+ * Available variables:
+ * - content: A list of content items. Use 'content' to print all content, or
+ * - attributes: HTML attributes for the container element.
+ *
+ * @see template_preprocess_oc_actor()
+ *
+ * @ingroup themeable
+ */
+#}
+<div{{ attributes.addClass('oc_actor') }}>
+  {% if content %}
+    {{- content -}}
+  {% endif %}
+</div>

modules/opencase_entities/templates/oc_case.html.twig

@@ -0,0 +1,22 @@
+{#
+/**
+ * @file oc_case.html.twig
+ * Default theme implementation to present Case data.
+ *
+ * This template is used when viewing Case pages.
+ *
+ *
+ * Available variables:
+ * - content: A list of content items. Use 'content' to print all content, or
+ * - attributes: HTML attributes for the container element.
+ *
+ * @see template_preprocess_oc_case()
+ *
+ * @ingroup themeable
+ */
+#}
+<div{{ attributes.addClass('oc_case') }}>
+  {% if content %}
+    {{- content -}}
+  {% endif %}
+</div>