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Java > Open Source Codes > org > apache > tapestry > web > LocalizedWebContextResourceFinder


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.tapestry.web;
16
17 import java.util.Locale JavaDoc;
18
19 import org.apache.hivemind.util.LocalizedNameGenerator;
20 import org.apache.hivemind.util.LocalizedResource;
21
22 /**
23  * Finds localized resources within a {@link org.apache.tapestry.web.WebContext}..
24  *
25  * @author Howard Lewis Ship
26  * @since 4.0
27  */
28
29 public class LocalizedWebContextResourceFinder
30 {
31     private WebContext _context;
32
33     public LocalizedWebContextResourceFinder(WebContext context)
34     {
35         _context = context;
36     }
37
38     /**
39      * Resolves the resource, returning a path representing the closest match (with respect to the
40      * provided locale). Returns null if no match.
41      * <p>
42      * The provided path is split into a base path and a suffix (at the last period character). The
43      * locale will provide different suffixes to the base path and the first match is returned.
44      */
45
46     public LocalizedResource resolve(String JavaDoc contextPath, Locale JavaDoc locale)
47     {
48         int dotx = contextPath.lastIndexOf('.');
49         String JavaDoc basePath = contextPath.substring(0, dotx);
50         String JavaDoc suffix = contextPath.substring(dotx);
51
52         LocalizedNameGenerator generator = new LocalizedNameGenerator(basePath, locale, suffix);
53
54         while (generator.more())
55         {
56             String JavaDoc candidatePath = generator.next();
57
58             if (isExistingResource(candidatePath))
59                 return new LocalizedResource(candidatePath, generator.getCurrentLocale());
60         }
61
62         return null;
63     }
64
65     private boolean isExistingResource(String JavaDoc path)
66     {
67         return _context.getResource(path) != null;
68     }
69 }
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