* * 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; /** * Decoder delegating the decoding to a chain of decoders. * * @author Jordi Boggiano * @author Johannes M. Schmitt * @author Lukas Kahwe Smith */ class ChainDecoder implements DecoderInterface { protected $decoders = array(); protected $decoderByFormat = array(); public function __construct(array $decoders = array()) { $this->decoders = $decoders; } /** * {@inheritdoc} */ final public function decode($data, $format, array $context = array()) { return $this->getDecoder($format)->decode($data, $format, $context); } /** * {@inheritdoc} */ public function supportsDecoding($format) { try { $this->getDecoder($format); } catch (RuntimeException $e) { return false; } return true; } /** * Gets the decoder supporting the format. * * @param string $format * * @return DecoderInterface * @throws RuntimeException if no decoder is found */ private function getDecoder($format) { if (isset($this->decoderByFormat[$format]) && isset($this->decoders[$this->decoderByFormat[$format]]) ) { return $this->decoders[$this->decoderByFormat[$format]]; } foreach ($this->decoders as $i => $decoder) { if ($decoder->supportsDecoding($format)) { $this->decoderByFormat[$format] = $i; return $decoder; } } throw new RuntimeException(sprintf('No decoder found for format "%s".', $format)); } }