All Downloads are FREE. Search and download functionalities are using the official Maven repository.

org.apache.mina.util.ConcurrentHashSet Maven / Gradle / Ivy

/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 *
 */
package org.apache.mina.util;

import java.util.Collection;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * A {@link ConcurrentHashMap}-backed {@link Set}.
 * 
 * @param  The type of the element stored in the set 
 *
 * @author Apache MINA Project
 */
public class ConcurrentHashSet extends MapBackedSet {

    private static final long serialVersionUID = 8518578988740277828L;

    /**
     * Creates a new instance of ConcurrentHashSet
     */
    public ConcurrentHashSet() {
        super(new ConcurrentHashMap());
    }

    /**
     * Creates a new instance of ConcurrentHashSet, initialized with 
     * the content of another collection
     * 
     * @param collection The collection to inject in this set
     */
    public ConcurrentHashSet(Collection collection) {
        super(new ConcurrentHashMap(), collection);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean add(E element) {
        Boolean answer = ((ConcurrentMap) map).putIfAbsent(element, Boolean.TRUE);
        
        return answer == null;
    }
}




© 2015 - 2024 Weber Informatics LLC | Privacy Policy