Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\serialization\EntityResolver;
Chris@0: 
Chris@17: use Drupal\Core\Entity\EntityRepositoryInterface;
Chris@0: use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * Resolves entities from data that contains an entity UUID.
Chris@0:  */
Chris@0: class UuidResolver implements EntityResolverInterface {
Chris@0: 
Chris@0:   /**
Chris@17:    * The entity repository.
Chris@0:    *
Chris@17:    * @var \Drupal\Core\Entity\EntityRepositoryInterface
Chris@0:    */
Chris@17:   protected $entityRepository;
Chris@0: 
Chris@0:   /**
Chris@0:    * Constructs a UuidResolver object.
Chris@0:    *
Chris@17:    * @param \Drupal\Core\Entity\EntityRepositoryInterface $entity_repository
Chris@17:    *   The entity repository.
Chris@0:    */
Chris@17:   public function __construct(EntityRepositoryInterface $entity_repository) {
Chris@17:     $this->entityRepository = $entity_repository;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function resolve(NormalizerInterface $normalizer, $data, $entity_type) {
Chris@0:     // The normalizer is what knows the specification of the data being
Chris@0:     // deserialized. If it can return a UUID from that data, and if there's an
Chris@0:     // entity with that UUID, then return its ID.
Chris@0:     if (($normalizer instanceof UuidReferenceInterface) && ($uuid = $normalizer->getUuid($data))) {
Chris@17:       if ($entity = $this->entityRepository->loadEntityByUuid($entity_type, $uuid)) {
Chris@0:         return $entity->id();
Chris@0:       }
Chris@0:     }
Chris@0:     return NULL;
Chris@0:   }
Chris@0: 
Chris@0: }