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Commons Collections example source code file (SynchronizedPriorityQueue.java)

This example Commons Collections source code file (SynchronizedPriorityQueue.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

nosuchelementexception, nosuchelementexception, object, object, priorityqueue, priorityqueue, string, synchronizedpriorityqueue, synchronizedpriorityqueue, util

The Commons Collections SynchronizedPriorityQueue.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;

import java.util.NoSuchElementException;

/**
 * A thread safe version of the PriorityQueue.
 * Provides synchronized wrapper methods for all the methods 
 * defined in the PriorityQueue interface.
 *
 * @deprecated PriorityQueue is replaced by the Buffer interface, see buffer subpackage.
 *  Due to be removed in v4.0.
 * @since Commons Collections 1.0
 * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
 * 
 * @author Ram Chidambaram
 */
public final class SynchronizedPriorityQueue implements PriorityQueue {

    /**
     * The underlying priority queue.
     */
    protected final PriorityQueue m_priorityQueue;

    /**
     * Constructs a new synchronized priority queue.
     *
     * @param priorityQueue  the priority queue to synchronize
     */
    public SynchronizedPriorityQueue(final PriorityQueue priorityQueue) {
        m_priorityQueue = priorityQueue;
    }

    /**
     * Clear all elements from queue.
     */
    public synchronized void clear() {
        m_priorityQueue.clear();
    }

    /**
     * Test if queue is empty.
     *
     * @return true if queue is empty else false.
     */
    public synchronized boolean isEmpty() {
        return m_priorityQueue.isEmpty();
    }

    /**
     * Insert an element into queue.
     *
     * @param element the element to be inserted
     */
    public synchronized void insert(final Object element) {
        m_priorityQueue.insert(element);
    }

    /**
     * Return element on top of heap but don't remove it.
     *
     * @return the element at top of heap
     * @throws NoSuchElementException if isEmpty() == true
     */
    public synchronized Object peek() throws NoSuchElementException {
        return m_priorityQueue.peek();
    }

    /**
     * Return element on top of heap and remove it.
     *
     * @return the element at top of heap
     * @throws NoSuchElementException if isEmpty() == true
     */
    public synchronized Object pop() throws NoSuchElementException {
        return m_priorityQueue.pop();
    }

    /**
     * Returns a string representation of the underlying queue.
     *
     * @return a string representation of the underlying queue
     */
    public synchronized String toString() {
        return m_priorityQueue.toString();
    }
    
}

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