Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/views/src/EventSubscriber/RouteSubscriber.php

@@ -0,0 +1,182 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\views\EventSubscriber\RouteSubscriber.
+ */
+
+namespace Drupal\views\EventSubscriber;
+
+use Drupal\Core\Entity\EntityManagerInterface;
+use Drupal\Core\State\StateInterface;
+use Drupal\Core\Routing\RouteSubscriberBase;
+use Drupal\Core\Routing\RoutingEvents;
+use Drupal\views\Plugin\views\display\DisplayRouterInterface;
+use Drupal\views\ViewExecutable;
+use Drupal\views\Views;
+use Symfony\Component\Routing\RouteCollection;
+use Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
+
+/**
+ * Builds up the routes of all views.
+ *
+ * The general idea is to execute first all alter hooks to determine which
+ * routes are overridden by views. This information is used to determine which
+ * views have to be added by views in the dynamic event.
+ *
+ *
+ * @see \Drupal\views\Plugin\views\display\PathPluginBase
+ */
+class RouteSubscriber extends RouteSubscriberBase {
+
+  /**
+   * Stores a list of view,display IDs which haven't be used in the alter event.
+   *
+   * @var array
+   */
+  protected $viewsDisplayPairs;
+
+  /**
+   * The view storage.
+   *
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  protected $viewStorage;
+
+  /**
+   * The state key value store.
+   *
+   * @var \Drupal\Core\State\StateInterface
+   */
+  protected $state;
+
+  /**
+   * Stores an array of route names keyed by view_id.display_id.
+   *
+   * @var array
+   */
+  protected $viewRouteNames = array();
+
+  /**
+   * Constructs a \Drupal\views\EventSubscriber\RouteSubscriber instance.
+   *
+   * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
+   *   The entity manager.
+   * @param \Drupal\Core\State\StateInterface $state
+   *   The state key value store.
+   */
+  public function __construct(EntityManagerInterface $entity_manager, StateInterface $state) {
+    $this->viewStorage = $entity_manager->getStorage('view');
+    $this->state = $state;
+  }
+
+  /**
+   * Resets the internal state of the route subscriber.
+   */
+  public function reset() {
+    $this->viewsDisplayPairs = NULL;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    $events = parent::getSubscribedEvents();
+    $events[RoutingEvents::FINISHED] = array('routeRebuildFinished');
+    // Ensure to run after the entity resolver subscriber
+    // @see \Drupal\Core\EventSubscriber\EntityRouteAlterSubscriber
+    $events[RoutingEvents::ALTER] = ['onAlterRoutes', -175];
+
+    return $events;
+  }
+
+  /**
+   * Gets all the views and display IDs using a route.
+   */
+  protected function getViewsDisplayIDsWithRoute() {
+    if (!isset($this->viewsDisplayPairs)) {
+      $this->viewsDisplayPairs = array();
+
+      // @todo Convert this method to some service.
+      $views = $this->getApplicableViews();
+      foreach ($views as $data) {
+        list($view_id, $display_id) = $data;
+        $this->viewsDisplayPairs[] = $view_id . '.' . $display_id;
+      }
+      $this->viewsDisplayPairs = array_combine($this->viewsDisplayPairs, $this->viewsDisplayPairs);
+    }
+    return $this->viewsDisplayPairs;
+  }
+
+  /**
+   * Returns a set of route objects.
+   *
+   * @return \Symfony\Component\Routing\RouteCollection
+   *   A route collection.
+   */
+  public function routes() {
+    $collection = new RouteCollection();
+    foreach ($this->getViewsDisplayIDsWithRoute() as $pair) {
+      list($view_id, $display_id) = explode('.', $pair);
+      $view = $this->viewStorage->load($view_id);
+      // @todo This should have an executable factory injected.
+      if (($view = $view->getExecutable()) && $view instanceof ViewExecutable) {
+        if ($view->setDisplay($display_id) && $display = $view->displayHandlers->get($display_id)) {
+          if ($display instanceof DisplayRouterInterface) {
+            $this->viewRouteNames += (array) $display->collectRoutes($collection);
+          }
+        }
+        $view->destroy();
+      }
+    }
+
+    $this->state->set('views.view_route_names', $this->viewRouteNames);
+    return $collection;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function alterRoutes(RouteCollection $collection) {
+    foreach ($this->getViewsDisplayIDsWithRoute() as $pair) {
+      list($view_id, $display_id) = explode('.', $pair);
+      $view = $this->viewStorage->load($view_id);
+      // @todo This should have an executable factory injected.
+      if (($view = $view->getExecutable()) && $view instanceof ViewExecutable) {
+        if ($view->setDisplay($display_id) && $display = $view->displayHandlers->get($display_id)) {
+          if ($display instanceof DisplayRouterInterface) {
+            // If the display returns TRUE a route item was found, so it does not
+            // have to be added.
+            $view_route_names = $display->alterRoutes($collection);
+            $this->viewRouteNames = $view_route_names + $this->viewRouteNames;
+            foreach ($view_route_names as $id_display => $route_name) {
+              $view_route_name = $this->viewsDisplayPairs[$id_display];
+              unset($this->viewsDisplayPairs[$id_display]);
+              $collection->remove("views.$view_route_name");
+            }
+          }
+        }
+        $view->destroy();
+      }
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function routeRebuildFinished() {
+    $this->reset();
+    $this->state->set('views.view_route_names', $this->viewRouteNames);
+  }
+
+  /**
+   * Returns all views/display combinations with routes.
+   *
+   * @see \Drupal\views\Views::getApplicableViews()
+   */
+  protected function getApplicableViews() {
+    return Views::getApplicableViews('uses_route');
+  }
+
+}