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 }