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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;
/**
* @author Bernhard Schussek <bschussek@gmail.com>
*/
class ValueToDuplicatesTransformer implements DataTransformerInterface
{
private $keys;
public function __construct(array $keys)
{
$this->keys = $keys;
}
/**
* Duplicates the given value through the array.
*
* @param mixed $value The value
*
* @return array The array
*/
public function transform($value)
{
$result = array();
foreach ($this->keys as $key) {
$result[$key] = $value;
}
return $result;
}
/**
* Extracts the duplicated value from an array.
*
* @param array $array
*
* @return mixed The value
*
* @throws TransformationFailedException If the given value is not an array or
* if the given array can not be transformed.
*/
public function reverseTransform($array)
{
if (!is_array($array)) {
throw new TransformationFailedException('Expected an array.');
}
$result = current($array);
$emptyKeys = array();
foreach ($this->keys as $key) {
if (!empty($array[$key])) {
if ($array[$key] !== $result) {
throw new TransformationFailedException(
'All values in the array should be the same'
);
}
} else {
$emptyKeys[] = $key;
}
}
if (count($emptyKeys) > 0) {
if (count($emptyKeys) == count($this->keys)) {
// All keys empty
return null;
}
throw new TransformationFailedException(
sprintf('The keys "%s" should not be empty', implode('", "', $emptyKeys)
));
}
return $result;
}
}
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