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Editing: ExpressionValidator.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\PropertyAccess\PropertyAccessorInterface;
use Symfony\Component\PropertyAccess\PropertyPath;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
use Symfony\Component\Validator\Exception\RuntimeException;

/**
 * @author Fabien Potencier <fabien@symfony.com>
 * @author Bernhard Schussek <bschussek@symfony.com>
 */
class ExpressionValidator extends ConstraintValidator
{
    /**
     * @var PropertyAccessorInterface
     */
    private $propertyAccessor;

/**
     * @var ExpressionLanguage
     */
    private $expressionLanguage;

public function __construct(PropertyAccessorInterface $propertyAccessor)
    {
        $this->propertyAccessor = $propertyAccessor;
    }

/**
     * {@inheritDoc}
     */
    public function validate($value, Constraint $constraint)
    {
        if (null === $value || '' === $value) {
            return;
        }

$variables = array();

if (null === $this->context->getPropertyName()) {
            $variables['this'] = $value;
        } else {
            // Extract the object that the property belongs to from the object
            // graph
            $path = new PropertyPath($this->context->getPropertyPath());
            $parentPath = $path->getParent();
            $root = $this->context->getRoot();

$variables['value'] = $value;
            $variables['this'] = $parentPath ? $this->propertyAccessor->getValue($root, $parentPath) : $root;
        }

if (!$this->getExpressionLanguage()->evaluate($constraint->expression, $variables)) {
            $this->context->addViolation($constraint->message);
        }
    }

private function getExpressionLanguage()
    {
        if (null === $this->expressionLanguage) {
            if (!class_exists('Symfony\Component\ExpressionLanguage\ExpressionLanguage')) {
                throw new RuntimeException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
            }
            $this->expressionLanguage = new ExpressionLanguage();
        }

return $this->expressionLanguage;
    }
}

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