001    /**
002     * Copyright (c) 2000-2011 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.kernel.util;
016    
017    import java.util.Set;
018    import java.util.concurrent.ConcurrentHashMap;
019    
020    /**
021     * @author Brian Wing Shun Chan
022     */
023    public class ConcurrentHashSet<E> extends MapBackedSet<E> {
024    
025            public ConcurrentHashSet() {
026                    super(new ConcurrentHashMap<E, Boolean>());
027            }
028    
029            public ConcurrentHashSet(int capacity) {
030                    super(new ConcurrentHashMap<E, Boolean>(capacity));
031            }
032    
033            public ConcurrentHashSet(Set<E> set) {
034                    super(new ConcurrentHashMap<E, Boolean>());
035    
036                    addAll(set);
037            }
038    
039    }