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Java > Open Source Codes > org > apache > hivemind > util > LocalizedContextResourceFinder


1 // Copyright 2004, 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.hivemind.util;
16
17 import java.net.MalformedURLException JavaDoc;
18 import java.util.Locale JavaDoc;
19
20 import javax.servlet.ServletContext JavaDoc;
21
22 /**
23  * Finds localized resources within the web application context.
24  * <p>
25  * Originally part of Tapestry 3.0.
26  *
27  * @see javax.servlet.ServletContext
28  * @author Howard Lewis Ship
29  * @since 1.1
30  */
31
32 public class LocalizedContextResourceFinder
33 {
34     private ServletContext JavaDoc _context;
35
36     public LocalizedContextResourceFinder(ServletContext JavaDoc context)
37     {
38         _context = context;
39     }
40
41     /**
42      * Resolves the resource, returning a path representing the closest match (with respect to the
43      * provided locale). Returns null if no match.
44      * <p>
45      * The provided path is split into a base path and a suffix (at the last period character). The
46      * locale will provide different suffixes to the base path and the first match is returned.
47      */
48
49     public LocalizedResource resolve(String JavaDoc contextPath, Locale JavaDoc locale)
50     {
51         int dotx = contextPath.lastIndexOf('.');
52         String JavaDoc basePath;
53         String JavaDoc suffix;
54         if (dotx >= 0) {
55             basePath = contextPath.substring(0, dotx);
56             suffix = contextPath.substring(dotx);
57         }
58         else
59         {
60             // Resource without extension
61 basePath = contextPath;
62             suffix = "";
63         }
64
65         LocalizedNameGenerator generator = new LocalizedNameGenerator(basePath, locale, suffix);
66
67         while (generator.more())
68         {
69             String JavaDoc candidatePath = generator.next();
70
71             if (isExistingResource(candidatePath))
72                 return new LocalizedResource(candidatePath, generator.getCurrentLocale());
73         }
74
75         return null;
76     }
77
78     private boolean isExistingResource(String JavaDoc path)
79     {
80         try
81         {
82             return _context.getResource(path) != null;
83         }
84         catch (MalformedURLException JavaDoc ex)
85         {
86             return false;
87         }
88     }
89 }
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