public void setViews(Class<?>[] views) {
   if (views == null) {
     _viewMatcher = null;
   } else {
     _viewMatcher = ViewMatcher.construct(views);
   }
 }
 public boolean visibleInView(Class<?> activeView) {
   return (_viewMatcher == null) || _viewMatcher.isVisibleForView(activeView);
 }