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Java > Open Source Codes > org > apache > tapestry > services > impl > LocalizedPropertySource


1 // Copyright 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.services.impl;
16
17 import java.util.Locale JavaDoc;
18
19 import org.apache.hivemind.util.Defense;
20 import org.apache.hivemind.util.LocalizedNameGenerator;
21 import org.apache.tapestry.engine.IPropertySource;
22
23 /**
24  * Wraps around a {@link org.apache.tapestry.engine.IPropertySource}to query a series of localized
25  * keys.
26  * <p>
27  * This is much simpler than the old {@link org.apache.tapestry.util.LocalizedPropertySource}, and
28  * allows the locale to be specified on a thread-safe, per-invocation basis.
29  *
30  * @author Howard M. Lewis Ship
31  * @since 4.0
32  */
33 public class LocalizedPropertySource
34 {
35     private IPropertySource _source;
36
37     public LocalizedPropertySource(IPropertySource source)
38     {
39         Defense.notNull(source, "source");
40
41         _source = source;
42     }
43
44     /**
45      * Get the property from the source, trying different variations of propertyName (adding
46      * suffixes).
47      *
48      * @param propertyName
49      * the base property name to search with.
50      * @param local
51      * the Locale used to generate suffixes (may be null).
52      */
53
54     public String JavaDoc getPropertyValue(String JavaDoc propertyName, Locale JavaDoc locale)
55     {
56         Defense.notNull(propertyName, "propertyName");
57
58         LocalizedNameGenerator g = new LocalizedNameGenerator(propertyName, locale, "");
59
60         while (g.more())
61         {
62             String JavaDoc localizedName = g.next();
63
64             String JavaDoc result = _source.getPropertyValue(localizedName);
65
66             if (result != null)
67                 return result;
68         }
69
70         return null;
71     }
72 }
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