--- /dev/null
+<?php
+
+namespace Drupal\serialization\Normalizer;
+
+use Drupal\Core\Field\FieldItemListInterface;
+use Symfony\Component\Serializer\Exception\InvalidArgumentException;
+use Symfony\Component\Serializer\Exception\UnexpectedValueException;
+use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
+
+/**
+ * Denormalizes data to Drupal field values.
+ *
+ * This class simply calls denormalize() on the individual FieldItems. The
+ * FieldItem normalizers are responsible for setting the field values for each
+ * item.
+ *
+ * @see \Drupal\serialization\Normalizer\FieldItemNormalizer.
+ */
+class FieldNormalizer extends ListNormalizer implements DenormalizerInterface {
+
+ /**
+ * {@inheritdoc}
+ */
+ protected $supportedInterfaceOrClass = FieldItemListInterface::class;
+
+ /**
+ * {@inheritdoc}
+ */
+ public function denormalize($data, $class, $format = NULL, array $context = []) {
+ if (!isset($context['target_instance'])) {
+ throw new InvalidArgumentException('$context[\'target_instance\'] must be set to denormalize with the FieldNormalizer');
+ }
+
+ if ($context['target_instance']->getParent() == NULL) {
+ throw new InvalidArgumentException('The field passed in via $context[\'target_instance\'] must have a parent set.');
+ }
+
+ /** @var FieldItemListInterface $items */
+ $items = $context['target_instance'];
+ $item_class = $items->getItemDefinition()->getClass();
+
+ if (!is_array($data)) {
+ throw new UnexpectedValueException(sprintf('Field values for "%s" must use an array structure', $items->getName()));
+ }
+
+ foreach ($data as $item_data) {
+ // Create a new item and pass it as the target for the unserialization of
+ // $item_data. All items in field should have removed before this method
+ // was called.
+ // @see \Drupal\serialization\Normalizer\ContentEntityNormalizer::denormalize().
+ $context['target_instance'] = $items->appendItem();
+ $this->serializer->denormalize($item_data, $item_class, $format, $context);
+ }
+ return $items;
+ }
+
+}