/* * PageRoot.java - Root node of the tree * Copyright (C) 2003 Alexandre THOMAS * alexthomas@free.fr * http://helpgui.sourceforge.net * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */package net.sourceforge.helpgui.page;import javax.swing.tree.MutableTreeNode;import javax.swing.tree.TreeNode;import java.util.Enumeration;/**  * Root node for the tree	* @author Alexandre THOMAS	*/public class PageRoot implements MutableTreeNode{	//List of pages	protected PageList pages;		// parent	protected MutableTreeNode parentNode;		// user object	protected Object userObject;	////////////////////////////////////////////////////////////////////	/** Constructor. */	public PageRoot () {		pages = new PageList();	}	/** Adds a page to this project (in the root of the project).*/	public void add(Page page)	{		if ((null != page) && (pages.indexOf(page) < 0))			pages.add(page);	}		/** Convert the Page into String. */	public String toString() {		return "Help GUI";	}	/// MutableTreeNode Implementation /////////////////////////////////			/** Adds child to the receiver at index.*/	public void 	insert(MutableTreeNode child, int index) {		// can deal only with pages doesn't need to support index		if (child.getClass() == Page.class)			pages.add((Page)child);			}  	/** Removes the child at index from the receiver. */        	public void 	remove(int index) {		pages.remove(index);	}  	/** Removes node from the receiver. */	public void 	remove(MutableTreeNode node) {		// can deal only with pages		if (node.getClass() == Page.class)			pages.remove((Page)node);	}		/** Removes the receiver from its parent. */  	public void 	removeFromParent() {		if (null != parentNode)			parentNode.remove(this);	}	/** Sets the parent of the receiver to newParent. */       	public void 	setParent(MutableTreeNode newParent) {		parentNode = newParent;	}          	/** Resets the user object of the receiver to object. */	public void 	setUserObject(Object object) {		userObject = object;	}		/** Returns the child TreeNode at index childIndex. */	public TreeNode getChildAt(int iChildIndex) {		return pages.get(iChildIndex);	}		/** Returns the number of children TreeNodes the receiver contains.*/	public int getChildCount() {		return pages.size();	}		/** Returns the parent TreeNode of the receiver. */	public TreeNode getParent() {		return null;	}		/** Returns the index of node in the receivers children.*/	public int getIndex(TreeNode node) {		// check if it's a page		if (node.getClass() != Page.class)			return -1;		// otherwise, checks if in the list		return pages.getIndex((Page)node);	}			/** Returns true if the receiver is a leaf.*/	public boolean 	isLeaf() {		return false;	} 		/** Returns true if the receiver allows children. */	public boolean 	getAllowsChildren() {		return true;	}		/** Returns the children of the receiver as an Enumeration.*/	public Enumeration 	children(){		return new PageEnumeration(pages);	}		public Page getFirstChild () {		Enumeration e = children();		if(e.hasMoreElements())			return (Page)e.nextElement();		return null;	}}