*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Bundle\FrameworkBundle\Validator;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidatorFactoryInterface;
use Symfony\Component\Validator\ConstraintValidatorInterface;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;
use Symfony\Component\Validator\Exception\ValidatorException;
/**
* Uses a service container to create constraint validators.
*
* A constraint validator should be tagged as "validator.constraint_validator"
* in the service container and include an "alias" attribute:
*
*
*
*
*
*
* A constraint may then return this alias in its validatedBy() method:
*
* public function validatedBy()
* {
* return 'some_alias';
* }
*
* @author Kris Wallsmith
*/
class ConstraintValidatorFactory implements ConstraintValidatorFactoryInterface
{
protected $container;
protected $validators;
/**
* @param ContainerInterface $container The service container
* @param array $validators An array of validators
*/
public function __construct(ContainerInterface $container, array $validators = array())
{
$this->container = $container;
$this->validators = $validators;
}
/**
* Returns the validator for the supplied constraint.
*
* @return ConstraintValidatorInterface A validator for the supplied constraint
*
* @throws ValidatorException When the validator class does not exist
* @throws UnexpectedTypeException When the validator is not an instance of ConstraintValidatorInterface
*/
public function getInstance(Constraint $constraint)
{
$name = $constraint->validatedBy();
if (!isset($this->validators[$name])) {
if (!class_exists($name)) {
throw new ValidatorException(sprintf('Constraint validator "%s" does not exist or it is not enabled. Check the "validatedBy" method in your constraint class "%s".', $name, \get_class($constraint)));
}
$this->validators[$name] = new $name();
} elseif (\is_string($this->validators[$name])) {
$this->validators[$name] = $this->container->get($this->validators[$name]);
}
if (!$this->validators[$name] instanceof ConstraintValidatorInterface) {
throw new UnexpectedTypeException($this->validators[$name], 'Symfony\Component\Validator\ConstraintValidatorInterface');
}
return $this->validators[$name];
}
}