Chris@0: <?php
Chris@0: 
Chris@0: /*
Chris@0:  * This file is part of the Symfony package.
Chris@0:  *
Chris@0:  * (c) Fabien Potencier <fabien@symfony.com>
Chris@0:  *
Chris@0:  * For the full copyright and license information, please view the LICENSE
Chris@0:  * file that was distributed with this source code.
Chris@0:  */
Chris@0: 
Chris@0: namespace Symfony\Component\Serializer\Encoder;
Chris@0: 
Chris@0: use Symfony\Component\Serializer\Exception\RuntimeException;
Chris@0: 
Chris@0: /**
Chris@0:  * Decoder delegating the decoding to a chain of decoders.
Chris@0:  *
Chris@0:  * @author Jordi Boggiano <j.boggiano@seld.be>
Chris@0:  * @author Johannes M. Schmitt <schmittjoh@gmail.com>
Chris@0:  * @author Lukas Kahwe Smith <smith@pooteeweet.org>
Chris@0:  */
Chris@0: class ChainDecoder implements DecoderInterface
Chris@0: {
Chris@0:     protected $decoders = array();
Chris@0:     protected $decoderByFormat = array();
Chris@0: 
Chris@0:     public function __construct(array $decoders = array())
Chris@0:     {
Chris@0:         $this->decoders = $decoders;
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * {@inheritdoc}
Chris@0:      */
Chris@0:     final public function decode($data, $format, array $context = array())
Chris@0:     {
Chris@0:         return $this->getDecoder($format)->decode($data, $format, $context);
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * {@inheritdoc}
Chris@0:      */
Chris@0:     public function supportsDecoding($format)
Chris@0:     {
Chris@0:         try {
Chris@0:             $this->getDecoder($format);
Chris@0:         } catch (RuntimeException $e) {
Chris@0:             return false;
Chris@0:         }
Chris@0: 
Chris@0:         return true;
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * Gets the decoder supporting the format.
Chris@0:      *
Chris@0:      * @param string $format
Chris@0:      *
Chris@0:      * @return DecoderInterface
Chris@0:      *
Chris@0:      * @throws RuntimeException If no decoder is found.
Chris@0:      */
Chris@0:     private function getDecoder($format)
Chris@0:     {
Chris@0:         if (isset($this->decoderByFormat[$format])
Chris@0:             && isset($this->decoders[$this->decoderByFormat[$format]])
Chris@0:         ) {
Chris@0:             return $this->decoders[$this->decoderByFormat[$format]];
Chris@0:         }
Chris@0: 
Chris@0:         foreach ($this->decoders as $i => $decoder) {
Chris@0:             if ($decoder->supportsDecoding($format)) {
Chris@0:                 $this->decoderByFormat[$format] = $i;
Chris@0: 
Chris@0:                 return $decoder;
Chris@0:             }
Chris@0:         }
Chris@0: 
Chris@0:         throw new RuntimeException(sprintf('No decoder found for format "%s".', $format));
Chris@0:     }
Chris@0: }