/**
 * Copyright (C)
 * 	2008 Jeremy Thomerson <jeremy@thomersonfamily.com>
 * 	2012 Michael Mosmann <michael@mosmann.de>
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.wicketstuff.pageserializer.common.analyze.report;

import java.io.Serializable;

/**
 * 
 * @author mosmann
 *
 */
public class Level implements Serializable
{
	final Level parent;
	
	/**
	 * Level Start
	 */
	public Level()
	{
		this(null);
	}
	
	private Level(Level parent) {
		this.parent=parent;
	}
	
	public Level down() {
		return new Level(this);
	}
	
	public Level up() {
		if (parent==null) throw new IllegalArgumentException("could not go up, parent is NULL");
		return parent;
	}
	
	public int distanceFromTop() {
		return parent!=null ? 1 + parent.distanceFromTop() : 0;
	}
}
