1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.jetspeed.util;
19
20 /***
21 * Queue interface similar to the java.util.Stack interface
22 *
23 * @author <a href="mailto:raphael@apache.org">Rapha\u00ebl Luta</a>
24 * @version $Id: Queue.java 516448 2007-03-09 16:25:47Z ate $
25 */
26 public interface Queue extends java.util.List
27 {
28 /***
29 * Adds a new object into the queue
30 */
31 public void push(Object obj);
32
33 /***
34 * Gets the first object in the queue and remove it from the queue
35 */
36 public Object pop();
37
38 /***
39 * Gets the first object in the queue without removing it from the queue
40 */
41 public Object peek();
42 }