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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\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;
}
}