/**
  * @param DisplayPageCommand $command
  */
 public function handle(DisplayPageCommand $command)
 {
     $id = $command->getId();
     $this->vars = $command->getVars();
     $this->request = $command->getRequest();
     $this->output = $command->getStream();
     $this->container = $command->getContainer();
     $this->registerContentTypes();
     /** @var RepositoryFactory $repositoryFactory */
     $repositoryFactory = $this->container->get('Repository');
     $repository = $repositoryFactory->forEntity(Page::class);
     $page = $repository->getById($id);
     $contentItems[] = $page->content->getAll();
     for ($m = $page->layout; $m != null; $m = $m->parent) {
         array_unshift($contentItems, $m->content->getAll());
     }
     $contentItems = $this->flatten($contentItems);
     if (!isset($page->parent)) {
         $page->parent = $page->layout;
     }
     $contentTree = $this->buildTree($contentItems);
     $data = get_object_vars($page);
     if ($data['title'][0] == ':') {
         // @todo Retrieve the title
     }
     $templatePath = $page->layout->template->path;
     $this->output->setTemplate($templatePath);
     $template = $this->loadTemplate(JPATH_ROOT . '/' . $templatePath . '/index.php', $data);
     $parts = preg_split('~</body>~', $template, 2);
     $parts[1] = '</body>' . $parts[1];
     $this->output->write($parts[0]);
     foreach ($contentTree as $root) {
         $root->accept($this->output);
     }
     $queryParams = $this->request->getQueryParams();
     if (isset($queryParams['debug'])) {
         $this->dumpSql();
     }
     $this->output->writeJavascript();
     $this->output->writeCss();
     $this->output->write($parts[1]);
 }