/**
* Returns a copy of the tree starting at the given node.
*
* @param tree The tree to copy (may be {@code null}).
* @return A mutable copy of the given tree, or {@code null} if the tree was null.
* @todo Use {@code getUserObject} when we can.
* @since 2.5
*/
public static MutableTreeNode copy(final TreeNode node) {
if (node == null) {
return null;
}
final DefaultMutableTreeNode target =
new DefaultMutableTreeNode(node.toString(), node.getAllowsChildren());
final Enumeration children = node.children();
if (children != null) {
while (children.hasMoreElements()) {
final TreeNode child = (TreeNode) children.nextElement();
target.add(copy(child));
}
}
return target;
}
