/**
  * @see EventListenerInterface::listen_events()
  * @param object $event_object
  * @return bool
  */
 public static function listen_events($event_object)
 {
     if ($event_object instanceof OrganisationUnitCreateEvent) {
         if ($event_object->get_stores_data() == true) {
             $organisation_unit_folder = new OrganisationUnitFolder(null);
             if ($organisation_unit_folder->create($event_object->get_organisation_unit_id()) == false) {
                 return false;
             }
         }
     }
     if ($event_object instanceof OrganisationUnitPostDeleteEvent) {
         if ($event_object->get_stores_data() == true) {
             $folder_id = OrganisationUnitFolder::get_folder_by_organisation_unit_id($event_object->get_organisation_unit_id());
             $organisation_unit_folder = new OrganisationUnitFolder($folder_id);
             if ($organisation_unit_folder->delete(true, true) == false) {
                 return false;
             }
         }
     }
     if ($event_object instanceof OrganisationUnitRenameEvent) {
         $organisation_unit = new OrganisationUnit($event_object->get_organisation_unit_id());
         $organisation_unit_folder = new OrganisationUnitFolder(self::get_folder_by_organisation_unit_id($event_object->get_organisation_unit_id()));
         if ($organisation_unit_folder->set_name($organisation_unit->get_name()) == false) {
             return false;
         }
     }
     if ($event_object instanceof OrganisationUnitChangeOwnerEvent) {
         $organisation_unit = new OrganisationUnit($event_object->get_organisation_unit_id());
         $folder_id = self::get_folder_by_organisation_unit_id($event_object->get_organisation_unit_id());
         if ($folder_id) {
             $organisation_unit_folder = new OrganisationUnitFolder($folder_id);
             if ($organisation_unit_folder->set_owner_id($organisation_unit->get_master_owner_id()) == false) {
                 return false;
             }
         }
     }
     return true;
 }