Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer::supportsNormalization PHP 메소드

    public function supportsNormalization($data, $format = null)
    {
        return is_object($data) && !$data instanceof \Traversable;
    }

 /**
  * {@inheritdoc}
  */
 public function supportsNormalization($data, $format = null)
 {
     return parent::supportsNormalization($data, $format) && $this->supports(get_class($data));
 }