TrueValidator.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\Validator\Constraints;

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

/**
 * @author Bernhard Schussek <bschussek@gmail.com>
 *
 * @api
 */
class TrueValidator extends ConstraintValidator {

  /**
   * {@inheritDoc}
   */
  public function validate($value, Constraint $constraint) {
    if (null === $value) {
      return;
    }
    if (true !== $value && 1 !== $value && '1' !== $value) {
      $this->context
        ->addViolation($constraint->message);
    }
  }

}