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Commons Collections example source code file (SynchronizedSortedSet.java)

This example Commons Collections source code file (SynchronizedSortedSet.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Collections tags/keywords

comparator, comparator, object, object, sortedset, sortedset, synchronizedcollection, synchronizedsortedset, synchronizedsortedset, util

The Commons Collections SynchronizedSortedSet.java source code

/*
 *  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.commons.collections.set;

import java.util.Comparator;
import java.util.SortedSet;

import org.apache.commons.collections.collection.SynchronizedCollection;

/**
 * Decorates another <code>SortedSet to synchronize its behaviour
 * for a multi-threaded environment.
 * <p>
 * Methods are synchronized, then forwarded to the decorated set.
 * <p>
 * This class is Serializable from Commons Collections 3.1.
 *
 * @since Commons Collections 3.0
 * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
 * 
 * @author Stephen Colebourne
 */
public class SynchronizedSortedSet extends SynchronizedCollection implements SortedSet {

    /** Serialization version */
    private static final long serialVersionUID = 2775582861954500111L;

    /**
     * Factory method to create a synchronized set.
     * 
     * @param set  the set to decorate, must not be null
     * @throws IllegalArgumentException if set is null
     */
    public static SortedSet decorate(SortedSet set) {
        return new SynchronizedSortedSet(set);
    }
    
    //-----------------------------------------------------------------------
    /**
     * Constructor that wraps (not copies).
     * 
     * @param set  the set to decorate, must not be null
     * @throws IllegalArgumentException if set is null
     */
    protected SynchronizedSortedSet(SortedSet set) {
        super(set);
    }

    /**
     * Constructor that wraps (not copies).
     * 
     * @param set  the set to decorate, must not be null
     * @param lock  the lock object to use, must not be null
     * @throws IllegalArgumentException if set is null
     */
    protected SynchronizedSortedSet(SortedSet set, Object lock) {
        super(set, lock);
    }

    /**
     * Gets the decorated set.
     * 
     * @return the decorated set
     */
    protected SortedSet getSortedSet() {
        return (SortedSet) collection;
    }

    //-----------------------------------------------------------------------
    public SortedSet subSet(Object fromElement, Object toElement) {
        synchronized (lock) {
            SortedSet set = getSortedSet().subSet(fromElement, toElement);
            // the lock is passed into the constructor here to ensure that the
            // subset is synchronized on the same lock as the parent
            return new SynchronizedSortedSet(set, lock);
        }
    }

    public SortedSet headSet(Object toElement) {
        synchronized (lock) {
            SortedSet set = getSortedSet().headSet(toElement);
            // the lock is passed into the constructor here to ensure that the
            // headset is synchronized on the same lock as the parent
            return new SynchronizedSortedSet(set, lock);
        }
    }

    public SortedSet tailSet(Object fromElement) {
        synchronized (lock) {
            SortedSet set = getSortedSet().tailSet(fromElement);
            // the lock is passed into the constructor here to ensure that the
            // tailset is synchronized on the same lock as the parent
            return new SynchronizedSortedSet(set, lock);
        }
    }

    public Object first() {
        synchronized (lock) {
            return getSortedSet().first();
        }
    }

    public Object last() {
        synchronized (lock) {
            return getSortedSet().last();
        }
    }

    public Comparator comparator() {
        synchronized (lock) {
            return getSortedSet().comparator();
        }
    }

}

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