Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\Routing;
Chris@0: 
Chris@0: use Symfony\Component\EventDispatcher\EventSubscriberInterface;
Chris@0: use Symfony\Component\Routing\RouteCollection;
Chris@0: 
Chris@0: /**
Chris@0:  * Provides a base implementation for RouteSubscriber.
Chris@0:  */
Chris@0: abstract class RouteSubscriberBase implements EventSubscriberInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * Alters existing routes for a specific collection.
Chris@0:    *
Chris@0:    * @param \Symfony\Component\Routing\RouteCollection $collection
Chris@0:    *   The route collection for adding routes.
Chris@0:    */
Chris@0:   abstract protected function alterRoutes(RouteCollection $collection);
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public static function getSubscribedEvents() {
Chris@0:     $events[RoutingEvents::ALTER] = 'onAlterRoutes';
Chris@0:     return $events;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Delegates the route altering to self::alterRoutes().
Chris@0:    *
Chris@0:    * @param \Drupal\Core\Routing\RouteBuildEvent $event
Chris@0:    *   The route build event.
Chris@0:    */
Chris@0:   public function onAlterRoutes(RouteBuildEvent $event) {
Chris@0:     $collection = $event->getRouteCollection();
Chris@0:     $this->alterRoutes($collection);
Chris@0:   }
Chris@0: 
Chris@0: }