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Java > Open Source Codes > org > lateralnz > common > util > StackThreadLocal


1 /* ====================================================================
2  * The LateralNZ Software License, Version 1.0
3  *
4  * Copyright (c) 2003 LateralNZ. All rights reserved.
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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.
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31  * or "Lateral" or "LateralNZ", nor may "PANTHER" or "LATERAL" or
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49  * This software consists of voluntary contributions made by many
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52  * http://www.lateralnz.org
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54  */

55 package org.lateralnz.common.util;
56
57 import java.util.Stack JavaDoc;
58 import java.util.EmptyStackException JavaDoc;
59
60 /**
61  *
62  *
63  * @author J R Briggs
64  */

65 public class StackThreadLocal implements Constants {
66   
67   private static ThreadLocal JavaDoc STACK = new ThreadLocal JavaDoc() {
68     protected synchronized Object JavaDoc initialValue() {
69       return new Stack JavaDoc();
70     }
71   };
72
73   private StackThreadLocal() {
74   }
75
76  /**
77   *
78   */

79   public static final void push(Object JavaDoc obj) {
80     Stack JavaDoc s = (Stack JavaDoc)STACK.get();
81     s.add(obj);
82   }
83  
84  /**
85   *
86   */

87   public static final Object JavaDoc peek() {
88     try {
89       Stack JavaDoc s = (Stack JavaDoc)STACK.get();
90       return s.peek();
91     }
92     catch (EmptyStackException JavaDoc nsee) {
93       return null;
94     }
95   }
96  
97  /**
98   *
99   */

100   public static final Object JavaDoc pop() {
101     try {
102       Stack JavaDoc s = (Stack JavaDoc)STACK.get();
103       return s.pop();
104     }
105     catch (EmptyStackException JavaDoc nsee) {
106       return null;
107     }
108   }
109 }
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