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Commons Collections example source code file (SynchronizedList.java)

This example Commons Collections source code file (SynchronizedList.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

collection, list, list, listiterator, listiterator, object, object, synchronizedcollection, synchronizedlist, synchronizedlist, util

The Commons Collections SynchronizedList.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.list;

import java.util.Collection;
import java.util.List;
import java.util.ListIterator;

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

/**
 * Decorates another <code>List to synchronize its behaviour
 * for a multi-threaded environment.
 * <p>
 * Methods are synchronized, then forwarded to the decorated list.
 * <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 SynchronizedList extends SynchronizedCollection implements List {

    /** Serialization version */
     private static final long serialVersionUID = -1403835447328619437L;

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

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

    /**
     * Gets the decorated list.
     * 
     * @return the decorated list
     */
    protected List getList() {
        return (List) collection;
    }

    //-----------------------------------------------------------------------
    public void add(int index, Object object) {
        synchronized (lock) {
            getList().add(index, object);
        }
    }

    public boolean addAll(int index, Collection coll) {
        synchronized (lock) {
            return getList().addAll(index, coll);
        }
    }

    public Object get(int index) {
        synchronized (lock) {
            return getList().get(index);
        }
    }

    public int indexOf(Object object) {
        synchronized (lock) {
            return getList().indexOf(object);
        }
    }

    public int lastIndexOf(Object object) {
        synchronized (lock) {
            return getList().lastIndexOf(object);
        }
    }

    /**
     * Iterators must be manually synchronized.
     * <pre>
     * synchronized (coll) {
     *   ListIterator it = coll.listIterator();
     *   // do stuff with iterator
     * }
     * 
     * @return an iterator that must be manually synchronized on the collection
     */
    public ListIterator listIterator() {
        return getList().listIterator();
    }

    /**
     * Iterators must be manually synchronized.
     * <pre>
     * synchronized (coll) {
     *   ListIterator it = coll.listIterator(3);
     *   // do stuff with iterator
     * }
     * 
     * @return an iterator that must be manually synchronized on the collection
     */
    public ListIterator listIterator(int index) {
        return getList().listIterator(index);
    }

    public Object remove(int index) {
        synchronized (lock) {
            return getList().remove(index);
        }
    }

    public Object set(int index, Object object) {
        synchronized (lock) {
            return getList().set(index, object);
        }
    }

    public List subList(int fromIndex, int toIndex) {
        synchronized (lock) {
            List list = getList().subList(fromIndex, toIndex);
            // the lock is passed into the constructor here to ensure that the sublist is
            // synchronized on the same lock as the parent list
            return new SynchronizedList(list, lock);
        }
    }

}

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