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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* 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\Encoder\DecoderInterface;
use Symfony\Component\Serializer\Exception\RuntimeException;
/**
* Decoder delegating the decoding to a chain of decoders.
*
* @author Jordi Boggiano <j.boggiano@seld.be>
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
* @author Lukas Kahwe Smith <smith@pooteeweet.org>
*/
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)
{
return $this->getDecoder($format)->decode($data, $format);
}
/**
* {@inheritdoc}
*/
public function supportsDecoding($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));
}
}
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