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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\Validator\Constraints;

use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;

/**
* @api
*/
class NullValidator extends ConstraintValidator
{
    /**
* Checks if the passed value is valid.
*
* @param mixed $value The value that should be validated
* @param Constraint $constraint The constraint for the validation
*
* @return Boolean Whether or not the value is valid
*
* @api
*/
    public function isValid($value, Constraint $constraint)
    {
        if (null !== $value) {
            $this->setMessage($constraint->message, array('{{ value }}' => $value));

            return false;
        }

        return true;
    }
}
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