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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\Form\Extension\Core\DataTransformer;
use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\TransformationFailedException;
/**
* Passes a value through multiple value transformers
*
* @author Bernhard Schussek <bschussek@gmail.com>
*/
class DataTransformerChain implements DataTransformerInterface
{
/**
* The value transformers
* @var DataTransformerInterface[]
*/
protected $transformers;
/**
* Uses the given value transformers to transform values
*
* @param array $transformers
*/
public function __construct(array $transformers)
{
$this->transformers = $transformers;
}
/**
* Passes the value through the transform() method of all nested transformers
*
* The transformers receive the value in the same order as they were passed
* to the constructor. Each transformer receives the result of the previous
* transformer as input. The output of the last transformer is returned
* by this method.
*
* @param mixed $value The original value
*
* @return mixed The transformed value
*
* @throws TransformationFailedException
*/
public function transform($value)
{
foreach ($this->transformers as $transformer) {
$value = $transformer->transform($value);
}
return $value;
}
/**
* Passes the value through the reverseTransform() method of all nested
* transformers
*
* The transformers receive the value in the reverse order as they were passed
* to the constructor. Each transformer receives the result of the previous
* transformer as input. The output of the last transformer is returned
* by this method.
*
* @param mixed $value The transformed value
*
* @return mixed The reverse-transformed value
*
* @throws TransformationFailedException
*/
public function reverseTransform($value)
{
for ($i = count($this->transformers) - 1; $i >= 0; --$i) {
$value = $this->transformers[$i]->reverseTransform($value);
}
return $value;
}
}
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