Queue.java

// SMSLib for Java v3
// A Java API library for sending and receiving SMS via a GSM modem
// or other supported gateways.
// Web Site: http://www.smslib.org
//
// Copyright (C) 2002-2008, Thanasis Delenikas, Athens/GREECE.
// SMSLib is distributed under the terms of the Apache License version 2.0
//
// Licensed 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.smslib.v3.helper;

import java.util.LinkedList;

/**
 * Generic implementation of a synchronized, non-blocking Queue data structure (internal SMSLib use).
 */
public class Queue
{
	@SuppressWarnings("unchecked")
	private LinkedList q;

	@SuppressWarnings("unchecked")
	public Queue()
	{
		q = new LinkedList();
	}

	@SuppressWarnings("unchecked")
	public synchronized void add(Object o)
	{
		q.addLast(o);
	}

	public synchronized Object get()
	{
		if (q.isEmpty()) return null;
		else return q.removeFirst();
	}

	public synchronized int size()
	{
		return q.size();
	}
}