4 * This file is part of the Symfony package.
6 * (c) Fabien Potencier <fabien@symfony.com>
8 * For the full copyright and license information, please view the LICENSE
9 * file that was distributed with this source code.
12 namespace Symfony\Component\DependencyInjection\Compiler;
14 use Symfony\Component\DependencyInjection\ContainerBuilder;
15 use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;
16 use Symfony\Component\DependencyInjection\Reference;
19 * Replaces all references to aliases with references to the actual service.
21 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
23 class ResolveReferencesToAliasesPass extends AbstractRecursivePass
28 public function process(ContainerBuilder $container)
30 parent::process($container);
32 foreach ($container->getAliases() as $id => $alias) {
33 $aliasId = $container->normalizeId($alias);
34 if ($aliasId !== $defId = $this->getDefinitionId($aliasId, $container)) {
35 $container->setAlias($id, $defId)->setPublic($alias->isPublic())->setPrivate($alias->isPrivate());
43 protected function processValue($value, $isRoot = false)
45 if ($value instanceof Reference) {
46 $defId = $this->getDefinitionId($id = $this->container->normalizeId($value), $this->container);
49 return new Reference($defId, $value->getInvalidBehavior());
53 return parent::processValue($value);
57 * Resolves an alias into a definition id.
59 * @param string $id The definition or alias id to resolve
60 * @param ContainerBuilder $container
62 * @return string The definition id with aliases resolved
64 private function getDefinitionId($id, ContainerBuilder $container)
67 while ($container->hasAlias($id)) {
68 if (isset($seen[$id])) {
69 throw new ServiceCircularReferenceException($id, array_merge(array_keys($seen), array($id)));
72 $id = $container->normalizeId($container->getAlias($id));