class LabelOnlyResourceObject

final class LabelOnlyResourceObject extends ResourceObject {
  
  /**
   * The entity represented by this resource object.
   *
   * @var \Drupal\Core\Entity\EntityInterface
   */
  protected $entity;
  
  /**
   * {@inheritdoc}
   */
  public static function createFromEntity(ResourceType $resource_type, EntityInterface $entity, ?LinkCollection $links = NULL) {
    $resource_object = new static($entity, $resource_type, $entity->uuid(), $resource_type->isVersionable() && $entity instanceof RevisionableInterface ? $entity->getRevisionId() : NULL, static::extractFieldsFromEntity($resource_type, $entity), static::buildLinksFromEntity($resource_type, $entity, $links ?: new LinkCollection([])));
    $resource_object->setEntity($entity);
    return $resource_object;
  }
  
  /**
   * Gets the decorated entity.
   *
   * @return \Drupal\Core\Entity\EntityInterface
   *   The label for which to only normalize its label.
   */
  public function getEntity() {
    return $this->entity;
  }
  
  /**
   * Sets the underlying entity.
   *
   * @param \Drupal\Core\Entity\EntityInterface $entity
   *   An entity.
   */
  protected function setEntity(EntityInterface $entity) {
    $this->entity = $entity;
  }
  
  /**
   * {@inheritdoc}
   */
  protected static function extractFieldsFromEntity(ResourceType $resource_type, EntityInterface $entity) {
    $fields = parent::extractFieldsFromEntity($resource_type, $entity);
    $public_label_field_name = $resource_type->getPublicName(static::getLabelFieldName($entity));
    return array_intersect_key($fields, [
      $public_label_field_name => TRUE,
    ]);
  }

}