defaultmutabletreenode.java

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		index = 0;
//		while (current != root) {
		do {

//			if (random.nextInt(3) < 2) {
			if (random.nextBoolean()) {
				node = new DefaultMutableTreeNode(String.valueOf(index));
				index++;
				current.add(node);
				current = node;
			} else {
				current = (DefaultMutableTreeNode) current.getParent();
			} // if

//		} // while
		} while (current != root && current != null);

		System.out.println("Number of nodes: " + index);

/*
		// Calc # children
		size = random.nextInt(4);

		for (index = 0; index < size; index++) {

			// Create Node
			node = new DefaultMutableTreeNode(String.valueOf(index));
			growTree(node);

			// Add Node to root
			root.add(node);

		} // for
*/
	} // growTree()

	public static void main(String[] argv) {
/*
		DefaultMutableTreeNode	node1 = new DefaultMutableTreeNode("node1");
		DefaultMutableTreeNode	node2 = new DefaultMutableTreeNode("node2");
		DefaultMutableTreeNode	node3 = new DefaultMutableTreeNode("node3");
		DefaultMutableTreeNode	node4 = new DefaultMutableTreeNode("node4");
		DefaultMutableTreeNode	node5 = new DefaultMutableTreeNode("node5");
		DefaultMutableTreeNode	node6 = new DefaultMutableTreeNode("node6");
		DefaultMutableTreeNode	node7 = new DefaultMutableTreeNode("node7");
		DefaultMutableTreeNode	node8 = new DefaultMutableTreeNode("node8");

		node1.add(node2);
		node1.add(node3);
		node2.add(node4);
		node2.add(node5);
		node3.add(node6);
		node3.add(node7);
		node5.add(node8);

		System.out.println("Depth (node1): " + node1.getDepth());
		System.out.println("Depth (node2): " + node2.getDepth());
		System.out.println("Depth (node3): " + node3.getDepth());
*/

		System.out.println("Create tree...");
		DefaultMutableTreeNode	root = new DefaultMutableTreeNode("root");
		growTree(root);
		System.out.println("Find depth...");
		System.out.println("Depth (root): " + root.getDepth());

	} // main

	/**
	 * getLevel
	 * @returns int
	 */
	public int getLevel() {

		// Variables
		TreeNode	current;
		int			count;

		// Lookup Parent
		count = -1;
		current = this;
		do {
			current = current.getParent();
			count++;
		} while (current != null);

		return count;

	} // getLevel()

	/**
	 * getPathToRoot
	 * @param value0 TODO
	 * @param value1 TODO
	 * @returns TreeNode[]
	 */
	protected TreeNode[] getPathToRoot(TreeNode value0, int value1) {
		return null; // TODO
	} // getPathToRoot()

	/**
	 * getUserObjectPath
	 * @returns Object[]
	 */
	public Object[] getUserObjectPath() {

		// Variables
		TreeNode[]	path;
		Object[]	object;
		int			size;
		int			index;

		// Get Path for Tree Nodes
		path = getPath();

		// Construct Object Path
		object = new Object[path.length];
		for (index = 0; index < path.length; index++) {
			object[index] = ((DefaultMutableTreeNode) path[index]).getUserObject();
		} // for

		// Return Object Path
		return object;

	} // getUserObjectPath()

	/**
	 * getRoot
	 * @returns TreeNode
	 */
	public TreeNode getRoot() {

		// Variables
		TreeNode	current;
		TreeNode	check;

		// Lookup Parent
		current = this;
		check = current.getParent();
		while (check != null) {
			current = check;
			check = current.getParent();
		} // while

		return current;

	} // getRoot()

	/**
	 * isRoot
	 * @returns boolean
	 */
	public boolean isRoot() {
		return (parent == null);
	} // isRoot()

	/**
	 * getNextNode
	 * @returns DefaultMutableTreeNode
	 */
	public DefaultMutableTreeNode getNextNode() {
		return null; // TODO
	} // getNextNode()

	/**
	 * getPreviousNode
	 * @returns DefaultMutableTreeNode
	 */
	public DefaultMutableTreeNode getPreviousNode() {
		return null; // TODO
	} // getPreviousNode()

	/**
	 * preorderEnumeration
	 * @returns Enumeration
	 */
	public Enumeration preorderEnumeration() {
		return null; // TODO
	} // preorderEnumeration()

	/**
	 * postorderEnumeration
	 * @returns Enumeration
	 */
	public Enumeration postorderEnumeration() {
		return null; // TODO
	} // postorderEnumeration()

	/**
	 * breadthFirstEnumeration
	 * @returns Enumeration
	 */
	public Enumeration breadthFirstEnumeration() {
		return null; // TODO
	} // breadthFirstEnumeration()

	/**
	 * depthFirstEnumeration
	 * @returns Enumeration
	 */
	public Enumeration depthFirstEnumeration() {
		return null; // TODO
	} // depthFirstEnumeration()

	/**
	 * pathFromAncestorEnumeration
	 * @param value0 TODO
	 * @returns Enumeration
	 */
	public Enumeration pathFromAncestorEnumeration(TreeNode value0) {
		return null; // TODO
	} // pathFromAncestorEnumeration()

	/**
	 * isNodeChild
	 * @param value0 TODO
	 * @returns boolean
	 */
	public boolean isNodeChild(TreeNode node) {

		// Variables
		TreeNode	current;
		int			index;

		// Sanity Check
		if (node == null) {
			return false;
		} // if

		// Process Path
		current = node;
		while (current != null) {
			if (current == this) {
				return true;
			} // if
			current = current.getParent();
		} // while

		// Node not located in path, not child
		return false;

	} // isNodeChild()

	/**
	 * getFirstChild
	 * @returns TreeNode
	 */
	public TreeNode getFirstChild() {
		return (TreeNode) children.firstElement();
	} // getFirstChild()

	/**
	 * getLastChild
	 * @returns TreeNode
	 */
	public TreeNode getLastChild() {
		return (TreeNode) children.lastElement();
	} // getLastChild()

	/**
	 * getChildAfter
	 * @param value0 TODO
	 * @returns TreeNode
	 */
	public TreeNode getChildAfter(TreeNode node) {

		// Variables
		int		index;

		// Check node
		if (node == null || node.getParent() != this) {
			throw new IllegalArgumentException();
		} // if

		// Get index of child node
		index = getIndex(node);

		// Check for child after
		index++;
		if (index == getChildCount()) {
			return null;
		} // if

		// Retrieve Child After
		return getChildAt(index);

	} // getChildAfter()

	/**
	 * getChildBefore
	 * @param value0 TODO
	 * @returns TreeNode
	 */
	public TreeNode getChildBefore(TreeNode node) {

		// Variables
		int		index;

		// Check node
		if (node == null || node.getParent() != this) {
			throw new IllegalArgumentException();
		} // if

		// Get index of child node
		index = getIndex(node);

		// Check for child before
		index--;
		if (index < 0) {
			return null;
		} // if

		// Retrieve Child Before
		return getChildAt(index);

	} // getChildBefore()

	/**
	 * isNodeSibling
	 * @param value0 TODO
	 * @returns boolean
	 */
	public boolean isNodeSibling(TreeNode node) {

		// Variables
		int			index;

		// Check for null
		if (node == null) {
			return false;
		} // if

		// Check if nodes share a parent
		if (node.getParent() == getParent() && getParent() != null) {
			return true;
		} // if

		// Nodes are not siblings
		return false;

	} // isNodeSibling()

	/**
	 * getSiblingCount
	 * @returns int
	 */
	public int getSiblingCount() {

		// Variables

		// Check for no parent
		if (parent == null) {
			return 1;
		} // if

		// Calculate sibling count from parent's child count
		return parent.getChildCount();

	} // getSiblingCount()

	/**
	 * getNextSibling
	 * @returns DefaultMutableTreeNode
	 */
	public DefaultMutableTreeNode getNextSibling() {

		// Variables
		int		index;
		int		size;

		// Check for Parent
		if (parent == null) {
			return null;
		} // if

		// Get Index of this node
		index = parent.getIndex(this);

		// Check for Next Sibling
		size = parent.getChildCount();
		index++;
		if (index == size) {
			return null;
		} // if

		return (DefaultMutableTreeNode) parent.getChildAt(index);

	} // getNextSibling()

	/**
	 * getPreviousSibling
	 * @returns DefaultMutableTreeNode
	 */
	public DefaultMutableTreeNode getPreviousSibling() {

		// Variables
		int		index;

		// Check for Parent
		if (parent == null) {
			return null;
		} // if

		// Get Index of this node
		index = parent.getIndex(this);

		// Check for Previous Sibling
		index--;
		if (index < 0) {
			return null;
		} // if

		return (DefaultMutableTreeNode) parent.getChildAt(index);

	} // getPreviousSibling()

	/**
	 * isLeaf
	 * @returns boolean
	 */
	public boolean isLeaf() {
		return (children.size() == 0); // TODO: check allowsChildren??
	} // isLeaf()

	/**
	 * getFirstLeaf
	 * @returns DefaultMutableTreeNode
	 */
	public DefaultMutableTreeNode getFirstLeaf() {

		// Variables
		TreeNode	current;

		current = this;
		while (current.getChildCount() > 0) {
			current = current.getChildAt(0);
		} // while

		return (DefaultMutableTreeNode) current;

	} // getFirstLeaf()

	/**
	 * getLastLeaf
	 * @returns DefaultMutableTreeNode
	 */
	public DefaultMutableTreeNode getLastLeaf() {

		// Variables
		TreeNode	current;
		int			size;

		current = this;
		size = current.getChildCount();
		while (size > 0) {
			current = current.getChildAt(size - 1);
			size = current.getChildCount();
		} // while

		return (DefaultMutableTreeNode) current;

	} // getLastLeaf()

	/**
	 * getNextLeaf
	 * @returns DefaultMutableTreeNode
	 */
	public DefaultMutableTreeNode getNextLeaf() {
		return null; // TODO
	} // getNextLeaf()

	/**
	 * getPreviousLeaf
	 * @returns DefaultMutableTreeNode
	 */
	public DefaultMutableTreeNode getPreviousLeaf() {
		return null; // TODO
	} // getPreviousLeaf()

	/**
	 * getLeafCount
	 * @returns int
	 */
	public int getLeafCount() {

		// Variables
		Enumeration	enum;
		int			count;
		TreeNode	current;

		// Get Enumeration of all descendants
		enum = depthFirstEnumeration();

		// Process Nodes
		count = 0;
		while (enum.hasMoreElements() == true) {
			current = (TreeNode) enum.nextElement();
			if (current.isLeaf() == true) {
				count++;
			} // if
		} // if

		return count;

	} // getLeafCount()


} // DefaultMutableTreeNode