<?php

namespace Drupal\custom_forms\Routing;

use Drupal\Core\Routing\RouteSubscriberBase;
use Symfony\Component\Routing\RouteCollection;

/**
 * Class RoutingSubscriber
 *
 * Subscribes to Drupal's routing system, allowing it to alter any routed that
 * have been loaded prior to this module getting loaded.
 *
 * @package Drupal\custom_forms\Routing
 */
class RoutingSubscriber extends RouteSubscriberBase {

  /**
   * Alters existing routes for a specific collection.
   *
   * @param \Symfony\Component\Routing\RouteCollection $collection
   *   The route collection for adding routes.
   */
  protected function alterRoutes(RouteCollection $collection) {
    if ($route = $collection->get('entity.custom_form.clone_form')) {
      $route->setDefault('_title_callback', '\Drupal\custom_forms\Controller\CustomFormController::cloneTitle');
    }
  }

}