/*******************************************************************************
 * Copyright (c) 2000, 2010 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.gef.ui.stackview;

import java.util.EventObject;

import org.eclipse.jface.viewers.Viewer;

import org.eclipse.gef.commands.CommandStack;
import org.eclipse.gef.commands.CommandStackListener;
import org.eclipse.gef.commands.CompoundCommand;

/**
 * Internal class used for a stack inspector.
 * 
 * @deprecated this class will be deleted
 */
public class TreeContentProvider implements
		org.eclipse.jface.viewers.ITreeContentProvider, CommandStackListener {

	Viewer viewer;

	/**
	 * Creates a new TreeContentProvider with the given CommandStack
	 * 
	 * @param stack
	 *            The CommandStack
	 */
	public TreeContentProvider(CommandStack stack) {
		stack.addCommandStackListener(this);

	}

	/**
	 * @see org.eclipse.jface.viewers.IContentProvider#dispose()
	 */
	public void dispose() {
	}

	/**
	 * @see CommandStackListener#commandStackChanged(EventObject)
	 */
	public void commandStackChanged(EventObject event) {
		viewer.refresh();
	}

	/**
	 * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
	 */
	public Object[] getChildren(Object o) {
		if (o instanceof CompoundCommand) {
			return ((CompoundCommand) o).getChildren();
		}
		return null;
	}

	/**
	 * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
	 */
	public Object[] getElements(Object o) {
		if (o instanceof CommandStack) {
			return ((CommandStack) o).getCommands();
		}
		// if (o instanceof CompoundCommand) {
		// }
		return null;
	}

	/**
	 * @see TreeContentProvider#getParent(Object)
	 */
	public Object getParent(Object child) {
		return null;
	}

	/**
	 * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
	 */
	public boolean hasChildren(Object o) {
		return o instanceof CompoundCommand;
	}

	/**
	 * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(Viewer,
	 *      Object, Object)
	 */
	public void inputChanged(Viewer v, Object o, Object n) {
		viewer = v;
	}

}
