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<?php
namespace Drupal\Core\Routing;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Routing\RouteCollection;
/**
* Provides a base implementation for RouteSubscriber.
*/
abstract class RouteSubscriberBase implements EventSubscriberInterface {
/**
* Alters existing routes for a specific collection.
*
* @param \Symfony\Component\Routing\RouteCollection $collection
* The route collection for adding routes.
*/
abstract protected function alterRoutes(RouteCollection $collection);
/**
* {@inheritdoc}
*/
public static function getSubscribedEvents() {
$events[RoutingEvents::ALTER] = 'onAlterRoutes';
return $events;
}
/**
* Delegates the route altering to self::alterRoutes().
*
* @param \Drupal\Core\Routing\RouteBuildEvent $event
* The route build event.
*/
public function onAlterRoutes(RouteBuildEvent $event) {
$collection = $event->getRouteCollection();
$this->alterRoutes($collection);
}
}