Implements \Drupal\serialization\EntityResolver\EntityResolverInterface::resolve().
Overrides EntityResolverInterface::resolve
public function resolve(NormalizerInterface $normalizer, $data, $entity_type) {
  foreach ($this->resolvers as $resolver) {
    if ($resolved = $resolver
      ->resolve($normalizer, $data, $entity_type)) {
      return $resolved;
    }
  }
  return NULL;
}