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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\Mapping\Loader;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\Exception\MappingException;
/**
* Base loader for validation metadata.
*
* This loader supports the loading of constraints from Symfony's default
* namespace (see {@link DEFAULT_NAMESPACE}) using the short class names of
* those constraints. Constraints can also be loaded using their fully
* qualified class names. At last, namespace aliases can be defined to load
* constraints with the syntax "alias:ShortName".
*
* @author Bernhard Schussek <bschussek@gmail.com>
*/
abstract class AbstractLoader implements LoaderInterface
{
/**
* The namespace to load constraints from by default.
*/
const DEFAULT_NAMESPACE = '\\Symfony\\Component\\Validator\\Constraints\\';
protected $namespaces = array();
/**
* Adds a namespace alias.
*
* The namespace alias can be used to reference constraints from specific
* namespaces in {@link newConstraint()}:
*
* $this->addNamespaceAlias('mynamespace', '\\Acme\\Package\\Constraints\\');
*
* $constraint = $this->newConstraint('mynamespace:NotNull');
*
* @param string $alias The alias
* @param string $namespace The PHP namespace
*/
protected function addNamespaceAlias($alias, $namespace)
{
$this->namespaces[$alias] = $namespace;
}
/**
* Creates a new constraint instance for the given constraint name.
*
* @param string $name The constraint name. Either a constraint relative
* to the default constraint namespace, or a fully
* qualified class name. Alternatively, the constraint
* may be preceded by a namespace alias and a colon.
* The namespace alias must have been defined using
* {@link addNamespaceAlias()}.
* @param mixed $options The constraint options
*
* @return Constraint
*
* @throws MappingException If the namespace prefix is undefined
*/
protected function newConstraint($name, $options = null)
{
if (false !== strpos($name, '\\') && class_exists($name)) {
$className = (string) $name;
} elseif (false !== strpos($name, ':')) {
list($prefix, $className) = explode(':', $name, 2);
if (!isset($this->namespaces[$prefix])) {
throw new MappingException(sprintf('Undefined namespace prefix "%s"', $prefix));
}
$className = $this->namespaces[$prefix].$className;
} else {
$className = self::DEFAULT_NAMESPACE.$name;
}
return new $className($options);
}
}