* * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Validator; use Symfony\Component\PropertyAccess\PropertyAccess; use Symfony\Component\PropertyAccess\PropertyAccessorInterface; use Symfony\Component\Validator\Constraints\ExpressionValidator; /** * Default implementation of the ConstraintValidatorFactoryInterface. * * This enforces the convention that the validatedBy() method on any * Constraint will return the class name of the ConstraintValidator that * should validate the Constraint. * * @author Bernhard Schussek */ class ConstraintValidatorFactory implements ConstraintValidatorFactoryInterface { protected $validators = array(); /** * @var PropertyAccessorInterface */ private $propertyAccessor; public function __construct(PropertyAccessorInterface $propertyAccessor = null) { $this->propertyAccessor = $propertyAccessor ?: PropertyAccess::createPropertyAccessor(); } /** * {@inheritDoc} */ public function getInstance(Constraint $constraint) { $className = $constraint->validatedBy(); // The second condition is a hack that is needed when CollectionValidator // calls itself recursively (Collection constraints can be nested). // Since the context of the validator is overwritten when initialize() // is called for the nested constraint, the outer validator is // acting on the wrong context when the nested validation terminates. // // A better solution - which should be approached in Symfony 3.0 - is to // remove the initialize() method and pass the context as last argument // to validate() instead. if (!isset($this->validators[$className]) || 'Symfony\Component\Validator\Constraints\CollectionValidator' === $className) { $this->validators[$className] = 'validator.expression' === $className ? new ExpressionValidator($this->propertyAccessor) : new $className(); } return $this->validators[$className]; } }