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/*
 * Copyright (C) 2006 Joe Walnes.
 * Copyright (C) 2007, 2008 XStream Committers.
 * All rights reserved.
 *
 * The software in this package is published under the terms of the BSD
 * style license a copy of which has been included with this distribution in
 * the LICENSE.txt file.
 * 
 * Created on 28. June 2006 by Guilherme Silveira
 */
package com.thoughtworks.xstream.persistence;

import java.util.AbstractSet;
import java.util.Iterator;

/**
 * A persistent set implementation.
 * 
 * @author Guilherme Silveira
 */
public class XmlSet extends AbstractSet {

	private final XmlMap map;

	public XmlSet(PersistenceStrategy persistenceStrategy) {
		this.map = new XmlMap(persistenceStrategy);
	}

	public Iterator iterator() {
		return map.values().iterator();
	}

	public int size() {
		return map.size();
	}

	public boolean add(Object o) {
		if (map.containsValue(o)) {
			return false;
		} else {
			// not-synchronized!
			map.put(findEmptyKey(), o);
			return true;
		}
	}

	private Long findEmptyKey() {
		long i = System.currentTimeMillis();
		while (map.containsKey(new Long(i))) {
			i++;
		}
		return new Long(i);
	}

}