FieldItemNormalizer.php in Zircon Profile 8

Contains \Drupal\hal\Normalizer\FieldItemNormalizer.

Namespace

Drupal\hal\Normalizer

File

core/modules/hal/src/Normalizer/FieldItemNormalizer.php

<?php

/**
 * @file
 * Contains \Drupal\hal\Normalizer\FieldItemNormalizer.
 */
namespace Drupal\hal\Normalizer;

use Drupal\Core\Field\FieldItemInterface;
use Symfony\Component\Serializer\Exception\InvalidArgumentException;

/**
 * Converts the Drupal field item object structure to HAL array structure.
 */
class FieldItemNormalizer extends NormalizerBase {

  /**
   * The interface or class that this Normalizer supports.
   *
   * @var string
   */
  protected $supportedInterfaceOrClass = 'Drupal\\Core\\Field\\FieldItemInterface';

  /**
   * {@inheritdoc}
   */
  public function normalize($field_item, $format = NULL, array $context = array()) {
    $values = $field_item
      ->toArray();
    if (isset($context['langcode'])) {
      $values['lang'] = $context['langcode'];
    }

    // The values are wrapped in an array, and then wrapped in another array
    // keyed by field name so that field items can be merged by the
    // FieldNormalizer. This is necessary for the EntityReferenceItemNormalizer
    // to be able to place values in the '_links' array.
    $field = $field_item
      ->getParent();
    return array(
      $field
        ->getName() => array(
        $values,
      ),
    );
  }

  /**
   * {@inheritdoc}
   */
  public function denormalize($data, $class, $format = NULL, array $context = array()) {
    if (!isset($context['target_instance'])) {
      throw new InvalidArgumentException('$context[\'target_instance\'] must be set to denormalize with the FieldItemNormalizer');
    }
    if ($context['target_instance']
      ->getParent() == NULL) {
      throw new InvalidArgumentException('The field item passed in via $context[\'target_instance\'] must have a parent set.');
    }
    $field_item = $context['target_instance'];

    // If this field is translatable, we need to create a translated instance.
    if (isset($data['lang'])) {
      $langcode = $data['lang'];
      unset($data['lang']);
      $field_definition = $field_item
        ->getFieldDefinition();
      if ($field_definition
        ->isTranslatable()) {
        $field_item = $this
          ->createTranslatedInstance($field_item, $langcode);
      }
    }
    $field_item
      ->setValue($this
      ->constructValue($data, $context));
    return $field_item;
  }

  /**
   * Build the field item value using the incoming data.
   *
   * @param $data
   *   The incoming data for this field item.
   * @param $context
   *   The context passed into the Normalizer.
   *
   * @return mixed
   *   The value to use in Entity::setValue().
   */
  protected function constructValue($data, $context) {
    return $data;
  }

  /**
   * Get a translated version of the field item instance.
   *
   * To indicate that a field item applies to one translation of an entity and
   * not another, the property path must originate with a translation of the
   * entity. This is the reason for using target_instances, from which the
   * property path can be traversed up to the root.
   *
   * @param \Drupal\Core\Field\FieldItemInterface $field_item
   *   The untranslated field item instance.
   * @param $langcode
   *   The langcode.
   *
   * @return \Drupal\Core\Field\FieldItemInterface
   *   The translated field item instance.
   */
  protected function createTranslatedInstance(FieldItemInterface $item, $langcode) {

    // Remove the untranslated item that was created for the default language
    // by FieldNormalizer::denormalize().
    $items = $item
      ->getParent();
    $delta = $item
      ->getName();
    unset($items[$delta]);

    // Instead, create a new item for the entity in the requested language.
    $entity = $item
      ->getEntity();
    $entity_translation = $entity
      ->hasTranslation($langcode) ? $entity
      ->getTranslation($langcode) : $entity
      ->addTranslation($langcode);
    $field_name = $item
      ->getFieldDefinition()
      ->getName();
    return $entity_translation
      ->get($field_name)
      ->appendItem();
  }

}

Classes

Name	Description
FieldItemNormalizer	Converts the Drupal field item object structure to HAL array structure.