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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;
/**
* Transforms between a Boolean and a string.
*
* @author Bernhard Schussek <bschussek@gmail.com>
* @author Florian Eckerstorfer <florian@eckerstorfer.org>
*/
class BooleanToStringTransformer implements DataTransformerInterface
{
/**
* The value emitted upon transform if the input is true
* @var string
*/
private $trueValue;
/**
* Sets the value emitted upon transform if the input is true.
*
* @param string $trueValue
*/
public function __construct($trueValue)
{
$this->trueValue = $trueValue;
}
/**
* Transforms a Boolean into a string.
*
* @param Boolean $value Boolean value.
*
* @return string String value.
*
* @throws TransformationFailedException If the given value is not a Boolean.
*/
public function transform($value)
{
if (null === $value) {
return null;
}
if (!is_bool($value)) {
throw new TransformationFailedException('Expected a Boolean.');
}
return true === $value ? $this->trueValue : null;
}
/**
* Transforms a string into a Boolean.
*
* @param string $value String value.
*
* @return Boolean Boolean value.
*
* @throws TransformationFailedException If the given value is not a string.
*/
public function reverseTransform($value)
{
if (null === $value) {
return false;
}
if (!is_string($value)) {
throw new TransformationFailedException('Expected a string.');
}
return true;
}
}
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