ThreadLocalStack


1   /*
2     * JBoss, Home of Professional Open Source
3     * Copyright 2005, JBoss Inc., and individual contributors as indicated
4     * by the @authors tag. See the copyright.txt in the distribution for a
5     * full listing of individual contributors.
6     *
7     * This is free software; you can redistribute it and/or modify it
8     * under the terms of the GNU Lesser General Public License as
9     * published by the Free Software Foundation; either version 2.1 of
10    * the License, or (at your option) any later version.
11    *
12    * This software is distributed in the hope that it will be useful,
13    * but WITHOUT ANY WARRANTY; without even the implied warranty of
14    * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15    * Lesser General Public License for more details.
16    *
17    * You should have received a copy of the GNU Lesser General Public
18    * License along with this software; if not, write to the Free
19    * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20    * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21    */
22  package org.jboss.aop.util;
23  
24  import java.util.ArrayList  ;
25  
26  /**
27   * Comment
28   *
29   * @author <a HREF="mailto:bill@jboss.org">Bill Burke</a>
30   * @version $Revision: 37406 $
31   */
32  public class ThreadLocalStack
33  {
34     private ThreadLocal   local = new ThreadLocal  ();
35  
36     public void push(Object   obj)
37     {
38        ArrayList   stack = (ArrayList  ) local.get();
39        if (stack == null)
40        {
41           stack = new ArrayList  ();
42           local.set(stack);
43        }
44        stack.add(obj);
45     }
46  
47     public Object   get()
48     {
49        ArrayList   stack = (ArrayList  ) local.get();
50        if (stack == null) return null;
51        return stack.get(stack.size() - 1);
52     }
53  
54     public void pop()
55     {
56        ArrayList   stack = (ArrayList  ) local.get();
57        stack.remove(stack.size() - 1);
58     }
59  }
60
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