private void setUnknown(FilteringNode node) {
    if (node.state == State.UNKNOWN) return;
    node.state = State.UNKNOWN;
    List<FilteringNode> nodes = myNodesCache.get(node);
    if (nodes != null) {
      for (FilteringNode n : nodes) {
        setUnknown(n);
      }
    }
  }
private void setUnknown(FilteringNode node)