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Viewing File: /opt/alt/php53/usr/share/pear/Symfony/Component/Form/DataTransformerInterface.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\TransformationFailedException;

/**
 * Transforms a value between different representations.
 *
 * @author Bernhard Schussek <bschussek@gmail.com>
 */
interface DataTransformerInterface
{
    /**
     * Transforms a value from the original representation to a transformed representation.
     *
     * This method is called on two occasions inside a form field:
     *
     * 1. When the form field is initialized with the data attached from the datasource (object or array).
     * 2. When data from a request is submitted using {@link Form::submit()} to transform the new input data
     *    back into the renderable format. For example if you have a date field and submit '2009-10-10'
     *    you might accept this value because its easily parsed, but the transformer still writes back
     *    "2009/10/10" onto the form field (for further displaying or other purposes).
     *
     * This method must be able to deal with empty values. Usually this will
     * be NULL, but depending on your implementation other empty values are
     * possible as well (such as empty strings). The reasoning behind this is
     * that value transformers must be chainable. If the transform() method
     * of the first value transformer outputs NULL, the second value transformer
     * must be able to process that value.
     *
     * By convention, transform() should return an empty string if NULL is
     * passed.
     *
     * @param mixed $value The value in the original representation
     *
     * @return mixed The value in the transformed representation
     *
     * @throws TransformationFailedException When the transformation fails.
     */
    public function transform($value);

    /**
     * Transforms a value from the transformed representation to its original
     * representation.
     *
     * This method is called when {@link Form::submit()} is called to transform the requests tainted data
     * into an acceptable format for your data processing/model layer.
     *
     * This method must be able to deal with empty values. Usually this will
     * be an empty string, but depending on your implementation other empty
     * values are possible as well (such as empty strings). The reasoning behind
     * this is that value transformers must be chainable. If the
     * reverseTransform() method of the first value transformer outputs an
     * empty string, the second value transformer must be able to process that
     * value.
     *
     * By convention, reverseTransform() should return NULL if an empty string
     * is passed.
     *
     * @param mixed $value The value in the transformed representation
     *
     * @return mixed The value in the original representation
     *
     * @throws TransformationFailedException When the transformation fails.
     */
    public function reverseTransform($value);
}
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