Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\views;
Chris@0: 
Chris@0: use Drupal\Core\Field\BaseFieldDefinition;
Chris@0: 
Chris@0: /**
Chris@0:  * A trait containing helper methods for field definitions.
Chris@0:  */
Chris@0: trait FieldAPIHandlerTrait {
Chris@0: 
Chris@0:   /**
Chris@0:    * The field definition.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Field\FieldDefinitionInterface
Chris@0:    */
Chris@0:   protected $fieldDefinition;
Chris@0: 
Chris@0:   /**
Chris@0:    * The field storage definition.
Chris@0:    *
Chris@0:    * @var \Drupal\field\FieldStorageConfigInterface
Chris@0:    */
Chris@0:   protected $fieldStorageDefinition;
Chris@0: 
Chris@0:   /**
Chris@0:    * Gets the field definition.
Chris@0:    *
Chris@0:    * A View works on an entity type across bundles, and thus only has access to
Chris@0:    * field storage definitions. In order to be able to use widgets and
Chris@0:    * formatters, we create a generic field definition out of that storage
Chris@0:    * definition.
Chris@0:    *
Chris@0:    * @see BaseFieldDefinition::createFromFieldStorageDefinition()
Chris@0:    *
Chris@0:    * @return \Drupal\Core\Field\FieldDefinitionInterface
Chris@0:    *   The field definition used by this handler.
Chris@0:    */
Chris@0:   protected function getFieldDefinition() {
Chris@0:     if (!$this->fieldDefinition) {
Chris@0:       $field_storage_config = $this->getFieldStorageDefinition();
Chris@0:       $this->fieldDefinition = BaseFieldDefinition::createFromFieldStorageDefinition($field_storage_config);
Chris@0:     }
Chris@0:     return $this->fieldDefinition;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Gets the field storage configuration.
Chris@0:    *
Chris@0:    * @return \Drupal\field\FieldStorageConfigInterface
Chris@0:    *   The field storage definition used by this handler
Chris@0:    */
Chris@0:   protected function getFieldStorageDefinition() {
Chris@0:     if (!$this->fieldStorageDefinition) {
Chris@0:       $field_storage_definitions = $this->getEntityManager()->getFieldStorageDefinitions($this->definition['entity_type']);
Chris@0:       $this->fieldStorageDefinition = $field_storage_definitions[$this->definition['field_name']];
Chris@0:     }
Chris@0:     return $this->fieldStorageDefinition;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Returns the entity manager.
Chris@0:    *
Chris@0:    * @return \Drupal\Core\Entity\EntityManagerInterface
Chris@0:    *   The entity manager service.
Chris@0:    */
Chris@0:   protected function getEntityManager() {
Chris@0:     if (!isset($this->entityManager)) {
Chris@0:       $this->entityManager = \Drupal::entityManager();
Chris@0:     }
Chris@0:     return $this->entityManager;
Chris@0:   }
Chris@0: 
Chris@0: }