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<?php
namespace Drupal\hal\Normalizer;
use Drupal\Component\Utility\NestedArray;
use Drupal\serialization\Normalizer\FieldNormalizer as SerializationFieldNormalizer;
/**
* Converts the Drupal field structure to HAL array structure.
*/
class FieldNormalizer extends SerializationFieldNormalizer {
/**
* The formats that the Normalizer can handle.
*
* @var array
*/
protected $format = ['hal_json'];
/**
* {@inheritdoc}
*/
public function normalize($field, $format = NULL, array $context = []) {
$normalized_field_items = [];
// Get the field definition.
$entity = $field->getEntity();
$field_name = $field->getName();
$field_definition = $field->getFieldDefinition();
// If this field is not translatable, it can simply be normalized without
// separating it into different translations.
if (!$field_definition->isTranslatable()) {
$normalized_field_items = $this->normalizeFieldItems($field, $format, $context);
}
// Otherwise, the languages have to be extracted from the entity and passed
// in to the field item normalizer in the context. The langcode is appended
// to the field item values.
else {
foreach ($entity->getTranslationLanguages() as $language) {
$context['langcode'] = $language->getId();
$translation = $entity->getTranslation($language->getId());
$translated_field = $translation->get($field_name);
$normalized_field_items = array_merge($normalized_field_items, $this->normalizeFieldItems($translated_field, $format, $context));
}
}
// Merge deep so that links set in entity reference normalizers are merged
// into the links property.
$normalized = NestedArray::mergeDeepArray($normalized_field_items);
return $normalized;
}
/**
* Helper function to normalize field items.
*
* @param \Drupal\Core\Field\FieldItemListInterface $field
* The field object.
* @param string $format
* The format.
* @param array $context
* The context array.
*
* @return array
* The array of normalized field items.
*/
protected function normalizeFieldItems($field, $format, $context) {
$normalized_field_items = [];
if (!$field->isEmpty()) {
foreach ($field as $field_item) {
$normalized_field_items[] = $this->serializer->normalize($field_item, $format, $context);
}
}
return $normalized_field_items;
}
}