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Java > Open Source Codes > org > lateralnz > panther > util > EJBRef


1 /* ====================================================================
2  * The LateralNZ Software License, Version 1.0
3  *
4  * Copyright (c) 2003 LateralNZ. All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  *
10  * 1. Redistributions of source code must retain the above copyright
11  * notice, this list of conditions and the following disclaimer.
12  *
13  * 2. Redistributions in binary form must reproduce the above copyright
14  * notice, this list of conditions and the following disclaimer in
15  * the documentation and/or other materials provided with the
16  * distribution.
17  *
18  * 3. The end-user documentation included with the redistribution,
19  * if any, must include the following acknowledgment:
20  * "This product includes software developed by
21  * LateralNZ (http://www.lateralnz.org/) and other third parties."
22  * Alternately, this acknowledgment may appear in the software itself,
23  * if and wherever such third-party acknowledgments normally appear.
24  *
25  * 4. The names "LateralNZ" must not be used to endorse or promote
26  * products derived from this software without prior written
27  * permission. For written permission, please
28  * contact oss@lateralnz.org.
29  *
30  * 5. Products derived from this software may not be called "Panther",
31  * or "Lateral" or "LateralNZ", nor may "PANTHER" or "LATERAL" or
32  * "LATERALNZ" appear in their name, without prior written
33  * permission of LateralNZ.
34  *
35  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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41  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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45  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46  * SUCH DAMAGE.
47  * ====================================================================
48  *
49  * This software consists of voluntary contributions made by many
50  * individuals on behalf of LateralNZ. For more
51  * information on Lateral, please see http://www.lateralnz.com/ or
52  * http://www.lateralnz.org
53  *
54  */
55 package org.lateralnz.panther.util;
56
57 import java.util.LinkedList JavaDoc;
58 import java.util.NoSuchElementException JavaDoc;
59
60 import org.lateralnz.common.util.Constants;
61
62 /**
63  * supporting methods to access a thread-local variable to store the ejb being
64  * used by the current thread
65  *
66  * @author J R Briggs
67  */
68 public final class EJBRef implements Constants {
69
70   private static ThreadLocal JavaDoc EJB_NAME = new ThreadLocal JavaDoc() {
71     protected synchronized Object JavaDoc initialValue() {
72       return new LinkedList JavaDoc();
73     }
74   };
75
76  /**
77   * push a name onto the ejbname stack
78   */
79   public static final void pushEJBName(String JavaDoc name) {
80     LinkedList JavaDoc ll = (LinkedList JavaDoc)EJB_NAME.get();
81     ll.add(name);
82   }
83   
84  /**
85   * get the current ejb name
86   */
87   public static final String JavaDoc getEJBName() {
88     try {
89       return (String JavaDoc)((LinkedList JavaDoc)EJB_NAME.get()).getLast();
90     }
91     catch (NoSuchElementException JavaDoc nsee) {
92       return EMPTY;
93     }
94   }
95   
96  /**
97   * pop the last name off the ejb stack
98   */
99   public static final String JavaDoc popEJBName() {
100     LinkedList JavaDoc ll = (LinkedList JavaDoc)EJB_NAME.get();
101     try {
102       return (String JavaDoc)ll.removeLast();
103     }
104     catch (NoSuchElementException JavaDoc nsee) {
105       return EMPTY;
106     }
107   }
108 }
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