KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > net > sf > clirr > core > EventMessages


1 //////////////////////////////////////////////////////////////////////////////
2 // Clirr: compares two versions of a java library for binary compatibility
3 // Copyright (C) 2003 - 2005 Lars Kühne
4 //
5 // This library is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU Lesser General Public
7 // License as published by the Free Software Foundation; either
8 // version 2.1 of the License, or (at your option) any later version.
9 //
10 // This library is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 // Lesser General Public License for more details.
14 //
15 // You should have received a copy of the GNU Lesser General Public
16 // License along with this library; if not, write to the Free Software
17 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 //////////////////////////////////////////////////////////////////////////////
19
20 package net.sf.clirr.core;
21
22 import java.util.ResourceBundle JavaDoc;
23 import java.util.Locale JavaDoc;
24 import java.util.Enumeration JavaDoc;
25
26 /**
27  * ResourceBundle that implements the default locale by delegating to the english bundle.
28  * This solves the bug described in
29  * https://sourceforge.net/tracker/index.php?func=detail&aid=594469&group_id=29721&atid=397078
30  * without having to duplicate any resource bundles, leading to a simpler build and a smaller jar.
31  *
32  * @author lkuehne
33  */
34 public class EventMessages extends ResourceBundle JavaDoc
35 {
36     /**
37      * The base name of the resource bundle from which message descriptions
38      * are read.
39      */
40     public static final String JavaDoc RESOURCE_NAME = EventMessages.class.getName();
41
42     private ResourceBundle JavaDoc delegate = null;
43
44     /**
45      * Control variable used in synchronized blocks that delegate to the {@link #delegate} bundle.
46      * The delegate bundle has "this" as it's parent.
47      * To prevent infinite loops in the lookup process when searching for
48      * non-existent keys we set isUsingDelegate to true to break out of the loop.
49      */
50     private boolean isUsingDelegate = false;
51
52     /**
53      * Constructor.
54      * @deprecated Typical user code never calls this directly but uses
55      * {@link java.util.ResourceBundle#getBundle(java.lang.String)} or one of it's variants instead.
56      */
57     public EventMessages()
58     {
59     }
60
61     private ResourceBundle JavaDoc getDelegate()
62     {
63         if (delegate == null)
64         {
65             delegate = ResourceBundle.getBundle(RESOURCE_NAME, Locale.ENGLISH);
66         }
67         return delegate;
68     }
69
70     /** @see java.util.ResourceBundle#handleGetObject */
71     protected final synchronized Object JavaDoc handleGetObject(String JavaDoc key)
72     {
73         try
74         {
75             if (isUsingDelegate)
76             {
77                 // the underlying bundle is delegating the call back to us
78 // this means that the key is unknown, so we return null
79 return null;
80             }
81             else
82             {
83                 isUsingDelegate = true;
84                 return getDelegate().getObject(key);
85             }
86         }
87         finally
88         {
89             isUsingDelegate = false;
90         }
91     }
92
93     /** @see java.util.ResourceBundle#getKeys */
94     public final synchronized Enumeration JavaDoc getKeys()
95     {
96         try
97         {
98             if (isUsingDelegate)
99             {
100                 // the underlying bundle is delegating the call back to us
101 // this means that the key is unknown, so we return null
102 return null;
103             }
104             else
105             {
106                 isUsingDelegate = true;
107                 return getDelegate().getKeys();
108             }
109         }
110         finally
111         {
112             isUsingDelegate = false;
113         }
114     }
115
116     /** @see java.util.ResourceBundle#getLocale */
117     public final Locale JavaDoc getLocale()
118     {
119         return getDelegate().getLocale();
120     }
121
122 }
123
Popular Tags