@Override
 public Calendar getById(String id) {
   try {
     Calendar cal = dataStorage.getCalendarById(id);
     if (cal != null) {
       cal.setDS(JCRStorage.JCR_STORAGE);
     }
     return cal;
   } catch (Exception ex) {
     LOG.error("Exception while loading calendar by ID", ex);
     return null;
   }
 }