www.aleph1.co.uk Git - yaffs-website/blob - web/core/modules/serialization/src/EntityResolver/UuidResolver.php

   1 <?php
   2
   3 namespace Drupal\serialization\EntityResolver;
   4
   5 use Drupal\Core\Entity\EntityManagerInterface;
   6 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
   7
   8 /**
   9  * Resolves entities from data that contains an entity UUID.
  10  */
  11 class UuidResolver implements EntityResolverInterface {
  12
  13   /**
  14    * The entity manager.
  15    *
  16    * @var \Drupal\Core\Entity\EntityManagerInterface
  17    */
  18   protected $entityManager;
  19
  20   /**
  21    * Constructs a UuidResolver object.
  22    *
  23    * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
  24    *   The entity manager.
  25    */
  26   public function __construct(EntityManagerInterface $entity_manager) {
  27     $this->entityManager = $entity_manager;
  28   }
  29
  30   /**
  31    * {@inheritdoc}
  32    */
  33   public function resolve(NormalizerInterface $normalizer, $data, $entity_type) {
  34     // The normalizer is what knows the specification of the data being
  35     // deserialized. If it can return a UUID from that data, and if there's an
  36     // entity with that UUID, then return its ID.
  37     if (($normalizer instanceof UuidReferenceInterface) && ($uuid = $normalizer->getUuid($data))) {
  38       if ($entity = $this->entityManager->loadEntityByUuid($entity_type, $uuid)) {
  39         return $entity->id();
  40       }
  41     }
  42     return NULL;
  43   }
  44
  45 }