initial commit

packages/woocommerce-blocks/assets/js/data/collections/reducers.js

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+/**
+ * Internal dependencies
+ */
+import { ACTION_TYPES as types } from './action-types';
+import { hasInState, updateState } from '../utils';
+
+/**
+ * Reducer for receiving items to a collection.
+ *
+ * @param   {Object}  state   The current state in the store.
+ * @param   {Object}  action  Action object.
+ *
+ * @return  {Object}          New or existing state depending on if there are
+ *                            any changes.
+ */
+const receiveCollection = ( state = {}, action ) => {
+	// Update last modified and previous last modified values.
+	if ( action.type === types.RECEIVE_LAST_MODIFIED ) {
+		if ( action.timestamp === state.lastModified ) {
+			return state;
+		}
+		return {
+			...state,
+			lastModified: action.timestamp,
+		};
+	}
+
+	// When invalidating data, remove stored values from state.
+	if ( action.type === types.INVALIDATE_RESOLUTION_FOR_STORE ) {
+		return {};
+	}
+
+	const { type, namespace, resourceName, queryString, response } = action;
+	// ids are stringified so they can be used as an index.
+	const ids = action.ids ? JSON.stringify( action.ids ) : '[]';
+	switch ( type ) {
+		case types.RECEIVE_COLLECTION:
+			if (
+				hasInState( state, [
+					namespace,
+					resourceName,
+					ids,
+					queryString,
+				] )
+			) {
+				return state;
+			}
+			state = updateState(
+				state,
+				[ namespace, resourceName, ids, queryString ],
+				response
+			);
+			break;
+		case types.RESET_COLLECTION:
+			state = updateState(
+				state,
+				[ namespace, resourceName, ids, queryString ],
+				response
+			);
+			break;
+		case types.ERROR:
+			state = updateState(
+				state,
+				[ namespace, resourceName, ids, queryString ],
+				response
+			);
+			break;
+	}
+	return state;
+};
+
+export default receiveCollection;