Added Event entity type.

src/Form/OCEventDeleteForm.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace Drupal\opencase\Form;
+
+use Drupal\Core\Entity\EntityConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+
+/**
+ * Builds the form to delete Event entities.
+ */
+class OCEventDeleteForm 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_event.collection');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfirmText() {
+    return $this->t('Delete');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $this->entity->delete();
+
+    $this->messenger()->addMessage(
+      $this->t('content @type: deleted @label.', [
+        '@type' => $this->entity->bundle(),
+        '@label' => $this->entity->label(),
+      ])
+    );
+
+    $form_state->setRedirectUrl($this->getCancelUrl());
+  }
+
+}

src/Form/OCEventForm.php

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

src/OCEventHtmlRouteProvider.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Drupal\opencase;
+
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Entity\Routing\AdminHtmlRouteProvider;
+
+/**
+ * Provides routes for Event entities.
+ *
+ * @see Drupal\Core\Entity\Routing\AdminHtmlRouteProvider
+ * @see Drupal\Core\Entity\Routing\DefaultHtmlRouteProvider
+ */
+class OCEventHtmlRouteProvider extends AdminHtmlRouteProvider {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getRoutes(EntityTypeInterface $entity_type) {
+    $collection = parent::getRoutes($entity_type);
+
+    // Provide your custom entity routes here.
+    return $collection;
+  }
+
+}

src/OCEventListBuilder.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Drupal\opencase;
+
+use Drupal\Core\Config\Entity\ConfigEntityListBuilder;
+use Drupal\Core\Entity\EntityInterface;
+
+/**
+ * Provides a listing of Event entities.
+ */
+class OCEventListBuilder extends ConfigEntityListBuilder {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildHeader() {
+    $header['label'] = $this->t('Event');
+    $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);
+  }
+
+}

src/Plugin/Derivative/AddEventsMenuLink.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace Drupal\opencase\Plugin\Derivative;
+
+use Drupal\Component\Plugin\Derivative\DeriverBase;
+use Drupal\Core\Plugin\Discovery\ContainerDeriverInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Derivative class that provides the menu links adding various types of events
+ */
+class AddEventsMenuLink extends DeriverBase implements ContainerDeriverInterface {
+
+  /**
+   * @var EntityTypeManagerInterface $entityTypeManager.
+   */
+
+  protected $entityTypeManager;
+  
+  /**
+   * Creates a AddEventsMenuLink instance.
+   *
+   * @param $base_plugin_id
+   * @param EntityTypeManagerInterface $entity_type_manager
+   */
+  public function __construct($base_plugin_id, EntityTypeManagerInterface $entity_type_manager) {
+    $this->entityTypeManager = $entity_type_manager;
+  }
+
+ /**
+   * {@inheritdoc}
+   */
+ public static function create(ContainerInterface $container, $base_plugin_id) {
+   return new static(
+    $base_plugin_id,
+    $container->get('entity_type.manager')
+   );
+ }
+  /**
+   * {@inheritdoc}
+   */
+  public function getDerivativeDefinitions($base_plugin_definition) {
+    $links = [];
+    $eventTypes = $this->entityTypeManager->getStorage('oc_event_type')->loadMultiple();
+    foreach ($eventTypes as $id => $eventType) {
+      $links[$id] = [
+        'title' => "Add ". $eventType->label() . " Event",
+        'route_name' => "entity.oc_event.add_form",
+        'route_parameters' => ['oc_event_type' => $eventType->id()]
+      ] + $base_plugin_definition;
+    }
+    return $links;
+  }
+}

src/Plugin/Menu/AddEventsMenuLink.php

@@ -0,0 +1,6 @@
+<?php
+namespace Drupal\opencase\Plugin\Menu;
+ 
+use Drupal\Core\Menu\MenuLinkDefault;
+ 
+class AddEventsMenuLink extends MenuLinkDefault {}