/**
  * @inheritdoc
  */
 public function collection(Collection $collection, $code = Response::HTTP_OK, $headers = array())
 {
     if (!$this->app) {
         throw new \RuntimeException('Cannot resolve collections without a reference to the application');
     }
     $request = $this->request;
     if ($collection->isError() && $collection->getError() == COLLECTION_NOT_FOUND) {
         if ($response = $this->collectionNotFound($collection, $request, $headers)) {
             return $response;
         }
     }
     if ($collection->getCollectionPath() != '/page_not_found') {
         if (!isset($collection->cPathFetchIsCanonical) || !$collection->cPathFetchIsCanonical) {
             // Handle redirect URL (additional page paths)
             /** @var Url $url */
             $url = $this->app->make('url/manager')->resolve([$collection]);
             $query = $url->getQuery();
             $query->modify($request->getQueryString());
             $url = $url->setQuery($query);
             return $this->redirect($url, Response::HTTP_MOVED_PERMANENTLY, $headers);
         }
     }
     // maintenance mode
     if ($collection->getCollectionPath() != '/login') {
         $smm = $this->config->get('concrete.maintenance_mode');
         if ($smm == 1 && !Key::getByHandle('view_in_maintenance_mode')->validate() && ($_SERVER['REQUEST_METHOD'] != 'POST' || Loader::helper('validation/token')->validate() == false)) {
             $v = new View('/frontend/maintenance_mode');
             $router = $this->app->make(RouterInterface::class);
             $tmpTheme = $router->getThemeByRoute('/frontend/maintenance_mode');
             $v->setViewTheme($tmpTheme[0]);
             $v->addScopeItems(['c' => $collection]);
             $request->setCurrentPage($collection);
             if (isset($tmpTheme[1])) {
                 $v->setViewTemplate($tmpTheme[1]);
             }
             return $this->view($v, $code, $headers);
         }
     }
     if ($collection->getCollectionPointerExternalLink() != '') {
         return $this->redirect($collection->getCollectionPointerExternalLink());
     }
     $cp = new Checker($collection);
     if ($cp->isError() && $cp->getError() == COLLECTION_FORBIDDEN) {
         return $this->forbidden($request->getUri(), Response::HTTP_FORBIDDEN, $headers);
     }
     if (!$collection->isActive() && !$cp->canViewPageVersions()) {
         return $this->notFound('', Response::HTTP_NOT_FOUND, $headers);
     }
     $scheduledVersion = Version::get($collection, "SCHEDULED");
     if ($publishDate = $scheduledVersion->cvPublishDate) {
         $datetime = $this->app->make('helper/date');
         $now = $datetime->date('Y-m-d G:i:s');
         if (strtotime($now) >= strtotime($publishDate)) {
             $scheduledVersion->approve();
             $collection->loadVersionObject('ACTIVE');
         }
     }
     if ($cp->canEditPageContents() || $cp->canEditPageProperties() || $cp->canViewPageVersions()) {
         $collection->loadVersionObject('RECENT');
     }
     $vp = new Checker($collection->getVersionObject());
     // returns the $vp object, which we then check
     if (is_object($vp) && $vp->isError()) {
         switch ($vp->getError()) {
             case COLLECTION_NOT_FOUND:
                 return $this->notFound('', Response::HTTP_NOT_FOUND, $headers);
                 break;
             case COLLECTION_FORBIDDEN:
                 return $this->forbidden($request->getUri(), Response::HTTP_FORBIDDEN, $headers);
                 break;
         }
     }
     // Now that we've passed all permissions checks, and we have a page, we check to see if we
     // ought to redirect based on base url or trailing slash settings
     $cms = $this->app;
     $site = $this->app['site']->getSite();
     $response = $cms->handleCanonicalURLRedirection($request, $site);
     if (!$response) {
         $response = $cms->handleURLSlashes($request, $site);
     }
     if (isset($response)) {
         return $response;
     }
     $dl = $cms->make('multilingual/detector');
     if ($dl->isEnabled()) {
         $dl->setupSiteInterfaceLocalization($collection);
     }
     if (!$request->getPath() && $request->isMethod('GET') && !$request->query->has('cID')) {
         // This is a request to the home page –http://www.mysite.com/
         // First, we check to see if we need to redirect to a default multilingual section.
         if ($dl->isEnabled() && $site->getConfigRepository()->get('multilingual.redirect_home_to_default_locale')) {
             // Let's retrieve the default language
             $ms = $dl->getPreferredSection();
             if (is_object($ms)) {
                 return $this->redirect(\URL::to($ms));
             }
         }
         // Otherwise, let's check to see if our home page, which we have loaded already, has a path (like /en)
         // If it does, we'll redirect to the path.
         if ($collection->getCollectionPath() != '') {
             return $this->redirect(\URL::to($collection));
         }
     }
     $request->setCurrentPage($collection);
     $c = $collection;
     // process.php needs this
     require DIR_BASE_CORE . '/bootstrap/process.php';
     $u = new User();
     // On page view event.
     $pe = new Event($collection);
     $pe->setUser($u);
     $pe->setRequest($request);
     $this->app['director']->dispatch('on_page_view', $pe);
     // Core menu items
     $item = new RelationListItem();
     $menu = $this->app->make('helper/concrete/ui/menu');
     $menu->addMenuItem($item);
     $controller = $collection->getPageController();
     // we update the current page with the one bound to this controller.
     $collection->setController($controller);
     return $this->controller($controller);
 }
 /**
  * Returns the error code if there is one
  */
 public function getError()
 {
     return parent::getError();
 }