* * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Serializer\Encoder; use Symfony\Component\Serializer\Exception\RuntimeException; /** * Encoder delegating the decoding to a chain of encoders. * * @author Jordi Boggiano * @author Johannes M. Schmitt * @author Lukas Kahwe Smith */ class ChainEncoder implements EncoderInterface { protected $encoders = array(); protected $encoderByFormat = array(); public function __construct(array $encoders = array()) { $this->encoders = $encoders; } /** * {@inheritdoc} */ final public function encode($data, $format, array $context = array()) { return $this->getEncoder($format)->encode($data, $format, $context); } /** * {@inheritdoc} */ public function supportsEncoding($format) { try { $this->getEncoder($format); } catch (RuntimeException $e) { return false; } return true; } /** * Checks whether the normalization is needed for the given format. * * @param string $format * * @return Boolean */ public function needsNormalization($format) { $encoder = $this->getEncoder($format); if (!$encoder instanceof NormalizationAwareInterface) { return true; } if ($encoder instanceof self) { return $encoder->needsNormalization($format); } return false; } /** * Gets the encoder supporting the format. * * @param string $format * * @return EncoderInterface * @throws RuntimeException if no encoder is found */ private function getEncoder($format) { if (isset($this->encoderByFormat[$format]) && isset($this->encoders[$this->encoderByFormat[$format]]) ) { return $this->encoders[$this->encoderByFormat[$format]]; } foreach ($this->encoders as $i => $encoder) { if ($encoder->supportsEncoding($format)) { $this->encoderByFormat[$format] = $i; return $encoder; } } throw new RuntimeException(sprintf('No encoder found for format "%s".', $format)); } }