CyclicalList.java

/* (c) 2014 Open Source Geospatial Foundation - all rights reserved
 * (c) 2001 - 2013 OpenPlans
 * This code is licensed under the GPL 2.0 license, available at the root
 * application directory.
 */
package org.vfny.geoserver.wms.responses.map.htmlimagemap.utils;
/**
 * Cyclical implementation of ArrayList: when a not
 * available index is used, then index is wrapped until
 * it falls in tre available index range.
 * @author m.bartolomeoli
 *
 */
public class CyclicalList extends java.util.ArrayList
{
	
	
	private static final long serialVersionUID = 5468175713393008920L;

	protected int wrapIndex(int index) {
		//perform the index wrapping
		while (index < 0)
			index = size() + index;
		if (index >= size())
			index %= size();
		return index;
	}
	
	public Object get(int index) {
		return super.get(wrapIndex(index));
		
	}
	
	public Object set(int index,Object value) {		
		return super.set(wrapIndex(index), value);		
	}
	

	public CyclicalList() { }

	
}