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Editing: CallbackTransformer.php

<?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;

use Symfony\Component\Form\Exception\UnexpectedTypeException;
use Symfony\Component\Form\Exception\TransformationFailedException;

class CallbackTransformer implements DataTransformerInterface
{
    /**
     * The callback used for forward transform
     * @var \Closure
     */
    private $transform;

/**
     * The callback used for reverse transform
     * @var \Closure
     */
    private $reverseTransform;

/**
     * Constructor.
     *
     * @param \Closure $transform        The forward transform callback
     * @param \Closure $reverseTransform The reverse transform callback
     */
    public function __construct(\Closure $transform, \Closure $reverseTransform)
    {
        $this->transform = $transform;
        $this->reverseTransform = $reverseTransform;
    }

/**
     * Transforms a value from the original representation to a transformed representation.
     *
     * @param mixed $data The value in the original representation
     *
     * @return mixed The value in the transformed representation
     *
     * @throws UnexpectedTypeException   when the argument is not a string
     * @throws TransformationFailedException  when the transformation fails
     */
    public function transform($data)
    {
        return call_user_func($this->transform, $data);
    }

/**
     * Transforms a value from the transformed representation to its original
     * representation.
     *
     * @param mixed $data The value in the transformed representation
     *
     * @return mixed The value in the original representation
     *
     * @throws UnexpectedTypeException   when the argument is not of the expected type
     * @throws TransformationFailedException  when the transformation fails
     */
    public function reverseTransform($data)
    {
        return call_user_func($this->reverseTransform, $data);
    }
}

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