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Java > Open Source Codes > org > jboss > ejb3 > 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.ejb3;
23
24 import java.util.ArrayList JavaDoc;
25 import java.util.List JavaDoc;
26
27 /**
28  * Comment
29  *
30  * @author <a HREF="mailto:bill@jboss.org">Bill Burke</a>
31  * @version $Revision: 42263 $
32  */
33 public class ThreadLocalStack<T>
34 {
35    private ThreadLocal JavaDoc<ArrayList JavaDoc<T>> stack = new ThreadLocal JavaDoc<ArrayList JavaDoc<T>>();
36
37    public void push(T obj)
38    {
39       ArrayList JavaDoc<T> list = stack.get();
40       if (list == null)
41       {
42          list = new ArrayList JavaDoc<T>(1);
43          stack.set(list);
44       }
45       list.add(obj);
46    }
47
48    public T pop()
49    {
50       ArrayList JavaDoc<T> list = stack.get();
51       if (list == null)
52       {
53          return null;
54       }
55       T rtn = list.remove(list.size() - 1);
56       if (list.size() == 0)
57       {
58          stack.set(null);
59          list.clear();
60       }
61       return rtn;
62    }
63
64    public T get()
65    {
66       ArrayList JavaDoc<T> list = (ArrayList JavaDoc<T>)stack.get();
67       if (list == null)
68       {
69          return null;
70       }
71       return list.get(list.size() - 1);
72    }
73
74    public List JavaDoc<T> getList()
75    {
76       return stack.get();
77    }
78 }
79
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