webapp_json-8.x-1.0-beta3/src/Normalizer/FieldNormalizer.php

<?php

namespace Drupal\webapp\Normalizer;

use Drupal\Component\Utility\NestedArray;
use Drupal\serialization\Normalizer\FieldNormalizer as SerializationFieldNormalizer;
use Drupal\webapp\Helpers\Flattener;

/**
 * Converts the Drupal field structure to WEBAPP array structure.
 */
class FieldNormalizer extends SerializationFieldNormalizer {

  /**
   * {@inheritdoc}
   */
  protected $format = ['webapp_json'];

  protected $flattener;

  public function __construct(Flattener $flattener) {
    $this->flattener = $flattener;
  }

  /**
   * {@inheritdoc}
   *
   * @param \Drupal\Core\Field\FieldItemList $field_items
   */
  public function normalize($field_items, $format = NULL, array $context = []) {
    $normalized_field_items = [];

    // Get the field definition.
    $entity = $field_items->getEntity();
    $field_name = $field_items->getName();
    $field_definition = $field_items->getFieldDefinition();

    // If this field is not translatable, it can simply be normalized without
    // separating it into different translations.
    if (!$field_definition->isTranslatable()) {
      $normalized_field_items = $this->normalizeFieldItems($field_items, $format, $context);
    }
    // Otherwise, the languages have to be extracted from the entity and passed
    // in to the field item normalizer in the context. The langcode is appended
    // to the field item values.
    else {
      $languages = $entity->getTranslationLanguages();
      $lang_code = \Drupal::languageManager()->getCurrentLanguage()->getId();
      $default_lang = \Drupal::languageManager()->getDefaultLanguage()->getId();

      if (array_key_exists($lang_code, $languages)) {
        $langId = $lang_code;
      } else {
        $langId = $default_lang;
      }

      if (!array_key_exists($langId, $languages)) {
        //$langId = array_key_first($languages);
        reset($languages);
        $langId = key($languages);
      }

      $context['langcode'] = $langId; //$language->getId();
      $translation = $entity->getTranslation($langId); //$language->getId());
      $translated_field_items = $translation->get($field_name);
      $normalized_field_items = array_merge($normalized_field_items, $this->normalizeFieldItems($translated_field_items, $format, $context));
    }

    // Merge deep so that links set in entity reference normalizers are merged
    // into the links property.
    $nestedArray = NestedArray::mergeDeepArray($normalized_field_items);

    foreach ($nestedArray as $naKey => $nestedArrayItem) {
      foreach ($nestedArrayItem as $naeKey => $nestedArrayItemElement) {
        $nestedArray[$naKey][$naeKey]['field_name'] = $field_name;
      }
    }

    $request = $context['request'];
    $query = $request->query;
    if ($query->has('flat')) {
      $this->addCacheableDependency($context, $this->flattener);
      $nestedArray = $this->flattener->flatten($nestedArray);
    } else {
      $this->addCacheableDependency($context, $this->flattener);
    }

    return $nestedArray;
  }

  /**
   * Helper function to normalize field items.
   *
   * @param \Drupal\Core\Field\FieldItemListInterface $field_items
   *   The field item list object.
   * @param string $format
   *   The format.
   * @param array $context
   *   The context array.
   *
   * @return array
   *   The array of normalized field items.
   */
  protected function normalizeFieldItems($field_items, $format, $context) {
    $normalized_field_items = [];
    if (!$field_items->isEmpty()) {
      foreach ($field_items as $field_item) {
        $normalized_field_items[] = $this->serializer->normalize($field_item, $format, $context);
      }
    }
    return $normalized_field_items;
  }

}