001 /** 002 * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved. 003 * 004 * The contents of this file are subject to the terms of the Liferay Enterprise 005 * Subscription License ("License"). You may not use this file except in 006 * compliance with the License. You can obtain a copy of the License by 007 * contacting Liferay, Inc. See the License for the specific language governing 008 * permissions and limitations under the License, including but not limited to 009 * distribution rights of the Software. 010 * 011 * 012 * 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 }