ExpressionValidator.php in Plug 7

Namespace

Symfony\Component\Validator\Constraints

File

lib/Symfony/validator/Symfony/Component/Validator/Constraints/ExpressionValidator.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <[e-mail]>
 *
 * 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\ExpressionLanguage\ExpressionLanguage;
use Symfony\Component\PropertyAccess\PropertyAccess;
use Symfony\Component\PropertyAccess\PropertyAccessorInterface;
use Symfony\Component\PropertyAccess\PropertyPath;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Context\ExecutionContextInterface;
use Symfony\Component\Validator\Exception\RuntimeException;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;

/**
 * @author Fabien Potencier <[e-mail]>
 * @author Bernhard Schussek <[e-mail]>
 */
class ExpressionValidator extends ConstraintValidator {

  /**
   * @var PropertyAccessorInterface
   */
  private $propertyAccessor;

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

  /**
   * @param PropertyAccessorInterface|null $propertyAccessor Optional as of Symfony 2.5
   *
   * @throws UnexpectedTypeException If the property accessor is invalid
   */
  public function __construct($propertyAccessor = null) {
    if (null !== $propertyAccessor && !$propertyAccessor instanceof PropertyAccessorInterface) {
      throw new UnexpectedTypeException($propertyAccessor, 'null or \\Symfony\\Component\\PropertyAccess\\PropertyAccessorInterface');
    }
    $this->propertyAccessor = $propertyAccessor;
  }

  /**
   * {@inheritdoc}
   */
  public function validate($value, Constraint $constraint) {
    if (!$constraint instanceof Expression) {
      throw new UnexpectedTypeException($constraint, __NAMESPACE__ . '\\Expression');
    }
    $variables = array();

    // Symfony 2.5+
    if ($this->context instanceof ExecutionContextInterface) {
      $variables['value'] = $value;
      $variables['this'] = $this->context
        ->getObject();
    }
    elseif (null === $this->context
      ->getPropertyName()) {
      $variables['value'] = $value;
      $variables['this'] = $value;
    }
    else {
      $root = $this->context
        ->getRoot();
      $variables['value'] = $value;
      if (is_object($root)) {

        // Extract the object that the property belongs to from the object
        // graph
        $path = new PropertyPath($this->context
          ->getPropertyPath());
        $parentPath = $path
          ->getParent();
        $variables['this'] = $parentPath ? $this
          ->getPropertyAccessor()
          ->getValue($root, $parentPath) : $root;
      }
      else {
        $variables['this'] = null;
      }
    }
    if (!$this
      ->getExpressionLanguage()
      ->evaluate($constraint->expression, $variables)) {
      $this
        ->buildViolation($constraint->message)
        ->setParameter('{{ value }}', $this
        ->formatValue($value))
        ->addViolation();
    }
  }
  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;
  }
  private function getPropertyAccessor() {
    if (null === $this->propertyAccessor) {
      if (!class_exists('Symfony\\Component\\PropertyAccess\\PropertyAccess')) {
        throw new RuntimeException('Unable to use expressions as the Symfony PropertyAccess component is not installed.');
      }
      $this->propertyAccessor = PropertyAccess::createPropertyAccessor();
    }
    return $this->propertyAccessor;
  }

}

Classes

Name	Description
ExpressionValidator	@author Fabien Potencier <[e-mail]> @author Bernhard Schussek <[e-mail]>