multiversion-8.x-1.0-beta34/src/EventSubscriber/NodeRevisionRouteSubscriber.php

<?php

namespace Drupal\multiversion\EventSubscriber;

use Drupal\Core\Routing\RouteSubscriberBase;
use Drupal\Core\Routing\RoutingEvents;
use Drupal\multiversion\Controller\MultiversionNodeController;
use Drupal\multiversion\Form\MultiversionRevisionRevertForm;
use Drupal\multiversion\Form\MultiversionRevisionRevertTranslationForm;
use Symfony\Component\Routing\RouteCollection;

/**
 * Alters entity.node.revision route.
 */
class NodeRevisionRouteSubscriber extends RouteSubscriberBase {

  /**
   * Alters existing route.
   *
   * @param \Symfony\Component\Routing\RouteCollection $collection
   *   The route collection for adding routes.
   */
  protected function alterRoutes(RouteCollection $collection) {
    // When Diff module is installed we don't need to use
    // MultiversionNodeController::revisionOverview, because we alter the
    // 'revision_overview_form' for in that case.
    // @see multiversion_form_revision_overview_form_alter().
    if (!\Drupal::moduleHandler()->moduleExists('diff')) {
      if ($route = $collection->get('entity.node.version_history')) {
        $route->setDefault('_controller', MultiversionNodeController::class . '::revisionOverview');
      }
    }

    if ($route = $collection->get('node.revision_revert_confirm')) {
      $route->setDefault('_form', MultiversionRevisionRevertForm::class);
    }
    if ($route = $collection->get('node.revision_revert_translation_confirm')) {
      $route->setDefault('_form', MultiversionRevisionRevertTranslationForm::class);
    }
  }

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    $events = parent::getSubscribedEvents();
    $events[RoutingEvents::ALTER] = array('onAlterRoutes', -500);
    return $events;
  }

}