code: @Override
      public synchronized boolean isNotificationEnabled(Notification notification) {
          if (filters.isEmpty()) {
              //Allow all
              return true;
          }
  
          final Iterator<NotificationFilter> i = filters.iterator();
          while (i.hasNext()) {
              if (i.next().isNotificationEnabled(notification)) {
                  return true;
              }
          }
  
          return false;
      }
docs: Handle notification filtering according to stored filters.