Issue #1945680 by dawehner: Provide a method that checks whether a certain...

Issue #1945680 by dawehner: Provide a method that checks whether a certain entity type provides a certain controller.

core/lib/Drupal/Core/Entity/EntityManager.php

@@ -199,6 +199,22 @@ public function processDefinition(&$definition, $plugin_id) {
     }
   }
 
+  /**
+   * Checks whether a certain entity type has a certain controller.
+   *
+   * @param string $entity_type
+   *   The name of the entity type.
+   * @param string $controller_type
+   *   The name of the controller.
+   *
+   * @return bool
+   *   Returns TRUE if the entity type has the controller, else FALSE.
+   */
+  public function hasController($entity_type, $controller_type) {
+    $definition = $this->getDefinition($entity_type);
+    return !empty($definition[$controller_type]);
+  }
+
   /**
    * Returns an entity controller class.
    *

core/modules/system/lib/Drupal/system/Tests/Entity/EntityManagerTest.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\system\Tests\Entity\EntityManagerTest.
+ */
+
+namespace Drupal\system\Tests\Entity;
+
+/**
+ * Tests methods on the entity manager.
+ *
+ * @see \Drupal\Core\Entity\EntityManager
+ */
+class EntityManagerTest extends EntityUnitTestBase {
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Entity Manager',
+      'description' => 'Tests methods on the entity manager.',
+      'group' => 'Entity API',
+    );
+  }
+
+  /**
+   * Tests some methods on the manager.
+   */
+  public function testMethods() {
+    // Tests the has controller method.
+    $entity_manager = $this->container->get('plugin.manager.entity');
+
+    $this->assertFalse($entity_manager->hasController('non_existent', 'controller_class'), 'A non existent entity type has no controller.');
+    $this->assertFalse($entity_manager->hasController('non_existent', 'non_existent_controller_class'), 'A non existent entity type has no controller.');
+
+    $this->assertFalse($entity_manager->hasController('entity_test', 'non_existent_controller_class'), 'An existent entity type does not have a non existent controller.');
+    $this->assertFalse($entity_manager->hasController('entity_test', 'render_controller_class'), 'The test entity does not have specified the render controller.');
+
+    $this->assertTrue($entity_manager->hasController('entity_test', 'controller_class'), 'The test entity has specified the controller class');
+  }
+
+}