/**
  * Annotate files from plugin configuration
  * @param backup_nested_element $assign the backup structure of the activity
  * @param string $subtype the plugin type to handle
  * @return void
  */
 protected function annotate_plugin_config_files(backup_nested_element $assign, $subtype)
 {
     $dummyassign = new assign(null, null, null);
     $plugins = $dummyassign->load_plugins($subtype);
     foreach ($plugins as $plugin) {
         $component = $plugin->get_subtype() . '_' . $plugin->get_type();
         $areas = $plugin->get_config_file_areas();
         foreach ($areas as $area) {
             $assign->annotate_files($component, $area, null);
         }
     }
 }
 /**
  * Restore files from plugin configuration
  * @param string $subtype the plugin type to handle
  * @return void
  */
 protected function add_plugin_config_files($subtype)
 {
     $dummyassign = new assign(null, null, null);
     $plugins = $dummyassign->load_plugins($subtype);
     foreach ($plugins as $plugin) {
         $component = $plugin->get_subtype() . '_' . $plugin->get_type();
         $areas = $plugin->get_config_file_areas();
         foreach ($areas as $area) {
             $this->add_related_files($component, $area, null);
         }
     }
 }