code: private void adjustNodeCount(final int delta) {
  		for (TableTreeNode parent = this; parent != null; parent = (TableTreeNode) parent.
  				getParent()) {
  			parent.nodeCount += delta;
  		}
  	}
docs: Adjusts the node count of this node and all parent nodes. Called when nodes are being added/removed from the
  tree.
  
  @param delta the change in the node count.