StackThreadLocal


1   /**
2    *
3    * Copyright 2003-2004 The Apache Software Foundation
4    *
5    *  Licensed under the Apache License, Version 2.0 (the "License");
6    *  you may not use this file except in compliance with the License.
7    *  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.geronimo.core.service;
19  
20  import java.util.LinkedList  ;
21  
22  /**
23   *
24   *
25   *
26   * @version $Rev: 46019 $ $Date: 2004-09-14 02:56:06 -0700 (Tue, 14 Sep 2004) $
27   */
28  public class StackThreadLocal {
29      private final ThreadLocal   threadLocal = new ThreadLocal  () {
30          protected Object   initialValue() {
31              return new LinkedList  ();
32          }
33      };
34  
35      public void push(Object   value) {
36          if (value == null) {
37              throw new IllegalArgumentException  ("Value is null");
38          }
39          ((LinkedList  ) threadLocal.get()).addFirst(value);
40      }
41  
42      public Object   pop() {
43          LinkedList   linkedList = ((LinkedList  ) threadLocal.get());
44          if (linkedList.isEmpty()) {
45              return null;
46          }
47          return linkedList.removeFirst();
48      }
49  
50      public Object   peek() {
51          LinkedList   linkedList = ((LinkedList  ) threadLocal.get());
52          if (linkedList.isEmpty()) {
53              return null;
54          }
55          return linkedList.getFirst();
56      }
57  }
58
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