MapSettableTransformer.java

/*
 * Created on Aug 5, 2007
 *
 * Copyright (c) 2007, the JUNG Project and the Regents of the University 
 * of California
 * All rights reserved.
 *
 * This software is open-source under the BSD license; see either
 * "license.txt" or
 * http://jung.sourceforge.net/license.txt for a description.
 */
package edu.uci.ics.jung.algorithms.util;

import java.util.Map;

/**
 * A <code>SettableTransformer</code> that operates on an underlying
 * <code>Map</code> instance. Similar to <code>MapTransformer</code>.
 * 
 * @author Joshua O'Madadhain
 */
public class MapSettableTransformer<I, O> implements SettableTransformer<I, O> {
	protected Map<I, O> map;

	/**
	 * Creates an instance based on <code>m</code>.
	 */
	public MapSettableTransformer(Map<I, O> m) {
		this.map = m;
	}

	@Override
	public O transform(I input) {
		return map.get(input);
	}

	@Override
	public void set(I input, O output) {
		map.put(input, output);
	}
}