01: /*
02: * JBoss, Home of Professional Open Source.
03: * Copyright 2006, Red Hat Middleware LLC, and individual contributors
04: * as indicated by the @author tags. See the copyright.txt file in the
05: * distribution for a full listing of individual contributors.
06: *
07: * This is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU Lesser General Public License as
09: * 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;
25: import java.util.List;
26:
27: /**
28: * Comment
29: *
30: * @author <a href="mailto:bill@jboss.org">Bill Burke</a>
31: * @version $Revision: 60233 $
32: */
33: public class ThreadLocalStack<T> {
34: private ThreadLocal<ArrayList<T>> stack = new ThreadLocal<ArrayList<T>>();
35:
36: public void push(T obj) {
37: ArrayList<T> list = stack.get();
38: if (list == null) {
39: list = new ArrayList<T>(1);
40: stack.set(list);
41: }
42: list.add(obj);
43: }
44:
45: public T pop() {
46: ArrayList<T> list = stack.get();
47: if (list == null) {
48: return null;
49: }
50: T rtn = list.remove(list.size() - 1);
51: if (list.size() == 0) {
52: stack.set(null);
53: list.clear();
54: }
55: return rtn;
56: }
57:
58: public T get() {
59: ArrayList<T> list = (ArrayList<T>) stack.get();
60: if (list == null) {
61: return null;
62: }
63: return list.get(list.size() - 1);
64: }
65:
66: public List<T> getList() {
67: return stack.get();
68: }
69: }
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