trait LayoutBuilderRoutesTrait in Drupal 9

trait LayoutBuilderRoutesTrait {

  /**
   * Builds the layout routes for the given values.
   *
   * @param \Symfony\Component\Routing\RouteCollection $collection
   *   The route collection.
   * @param \Drupal\layout_builder\SectionStorage\SectionStorageDefinition $definition
   *   The definition of the section storage.
   * @param string $path
   *   The path patten for the routes.
   * @param array $defaults
   *   (optional) An array of default parameter values.
   * @param array $requirements
   *   (optional) An array of requirements for parameters.
   * @param array $options
   *   (optional) An array of options.
   * @param string $route_name_prefix
   *   (optional) The prefix to use for the route name.
   * @param string $entity_type_id
   *   (optional) The entity type ID, if available.
   */
  protected function buildLayoutRoutes(RouteCollection $collection, SectionStorageDefinition $definition, $path, array $defaults = [], array $requirements = [], array $options = [], $route_name_prefix = '', $entity_type_id = '') {
    $type = $definition
      ->id();
    $defaults['section_storage_type'] = $type;

    // Provide an empty value to allow the section storage to be upcast.
    $defaults['section_storage'] = '';

    // Trigger the layout builder access check.
    $requirements['_layout_builder_access'] = 'view';

    // Trigger the layout builder RouteEnhancer.
    $options['_layout_builder'] = TRUE;

    // Trigger the layout builder param converter.
    $parameters['section_storage']['layout_builder_tempstore'] = TRUE;

    // Merge the passed in options in after Layout Builder's parameters.
    $options = NestedArray::mergeDeep([
      'parameters' => $parameters,
    ], $options);
    if ($route_name_prefix) {
      $route_name_prefix = "layout_builder.{$type}.{$route_name_prefix}";
    }
    else {
      $route_name_prefix = "layout_builder.{$type}";
    }
    $main_defaults = $defaults;
    $main_options = $options;
    if ($entity_type_id) {
      $main_defaults['_entity_form'] = "{$entity_type_id}.layout_builder";
    }
    else {
      $main_defaults['_controller'] = '\\Drupal\\layout_builder\\Controller\\LayoutBuilderController::layout';
    }
    $main_defaults['_title_callback'] = '\\Drupal\\layout_builder\\Controller\\LayoutBuilderController::title';
    $route = (new Route($path))
      ->setDefaults($main_defaults)
      ->setRequirements($requirements)
      ->setOptions($main_options);
    $collection
      ->add("{$route_name_prefix}.view", $route);
    $discard_changes_defaults = $defaults;
    $discard_changes_defaults['_form'] = '\\Drupal\\layout_builder\\Form\\DiscardLayoutChangesForm';
    $route = (new Route("{$path}/discard-changes"))
      ->setDefaults($discard_changes_defaults)
      ->setRequirements($requirements)
      ->setOptions($options);
    $collection
      ->add("{$route_name_prefix}.discard_changes", $route);
    if (is_subclass_of($definition
      ->getClass(), OverridesSectionStorageInterface::class)) {
      $revert_defaults = $defaults;
      $revert_defaults['_form'] = '\\Drupal\\layout_builder\\Form\\RevertOverridesForm';
      $route = (new Route("{$path}/revert"))
        ->setDefaults($revert_defaults)
        ->setRequirements($requirements)
        ->setOptions($options);
      $collection
        ->add("{$route_name_prefix}.revert", $route);
    }
    elseif (is_subclass_of($definition
      ->getClass(), DefaultsSectionStorageInterface::class)) {
      $disable_defaults = $defaults;
      $disable_defaults['_form'] = '\\Drupal\\layout_builder\\Form\\LayoutBuilderDisableForm';
      $disable_options = $options;
      unset($disable_options['_admin_route'], $disable_options['_layout_builder']);
      $route = (new Route("{$path}/disable"))
        ->setDefaults($disable_defaults)
        ->setRequirements($requirements)
        ->setOptions($disable_options);
      $collection
        ->add("{$route_name_prefix}.disable", $route);
    }
  }

}