// required by TreeSelectionListener interface
public void valueChanged(TreeSelectionEvent e) {
// get selected node
DefaultMutableTreeNode node = (DefaultMutableTreeNode) e.getPath().getLastPathComponent();
if (node == null) return;
// get node data object
TermNode nodeInfo = (TermNode) node.getUserObject();
// load children only for leaf nodes and those that have
// not been marked as processed.
if (node.isLeaf() && node.getAllowsChildren()) {
System.out.println("will load children for: " + nodeInfo);
// load children. if no children, set allowsChildren to false
if (!parent.loadChildren(node, nodeInfo.getTermId())) {
node.setAllowsChildren(false);
}
}
// loadmetadata
System.out.println("will load metadata for: " + nodeInfo.getTermId());
// call method on parent container
parent.loadMetaData(nodeInfo.getTermId());
}