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    }