* * 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 */ 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; } }