diff core/lib/Drupal/Core/ParamConverter/EntityRevisionParamConverter.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Core/ParamConverter/EntityRevisionParamConverter.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,71 @@
+<?php
+
+namespace Drupal\Core\ParamConverter;
+
+use Drupal\Core\Entity\EntityRepositoryInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Symfony\Component\Routing\Route;
+
+/**
+ * Parameter converter for upcasting entity revision IDs to full objects.
+ *
+ * This is useful for pages which want to show a specific revision, like
+ * "/entity_example/{entity_example}/revision/{entity_example_revision}".
+ *
+ *
+ * In order to use it you should specify some additional options in your route:
+ * @code
+ * example.route:
+ *   path: /foo/{entity_example_revision}
+ *   options:
+ *     parameters:
+ *       entity_example_revision:
+ *         type: entity_revision:entity_example
+ * @endcode
+ */
+class EntityRevisionParamConverter implements ParamConverterInterface {
+
+  /**
+   * The entity type manager.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  protected $entityTypeManager;
+
+  /**
+   * The entity repository.
+   *
+   * @var \Drupal\Core\Entity\EntityRepositoryInterface
+   */
+  protected $entityRepository;
+
+  /**
+   * Creates a new EntityRevisionParamConverter instance.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   *   The entity type manager.
+   * @param \Drupal\Core\Entity\EntityRepositoryInterface $entity_repository
+   *   The entity repository.
+   */
+  public function __construct(EntityTypeManagerInterface $entity_type_manager, EntityRepositoryInterface $entity_repository) {
+    $this->entityTypeManager = $entity_type_manager;
+    $this->entityRepository = $entity_repository;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function convert($value, $definition, $name, array $defaults) {
+    list (, $entity_type_id) = explode(':', $definition['type'], 2);
+    $entity = $this->entityTypeManager->getStorage($entity_type_id)->loadRevision($value);
+    return $this->entityRepository->getTranslationFromContext($entity);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function applies($definition, $name, Route $route) {
+    return isset($definition['type']) && strpos($definition['type'], 'entity_revision:') !== FALSE;
+  }
+
+}