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Java > Open Source Codes > org > apache > hivemind > schema > rules > ResourceTranslator


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.schema.rules;
16
17 import java.util.Locale JavaDoc;
18
19 import org.apache.hivemind.ApplicationRuntimeException;
20 import org.apache.hivemind.HiveMind;
21 import org.apache.hivemind.Location;
22 import org.apache.hivemind.Resource;
23 import org.apache.hivemind.internal.Module;
24 import org.apache.hivemind.schema.Translator;
25
26 /**
27  * Translator that converts the value to be a resource relative to
28  * the contributing module's deployment descriptor.
29  *
30  * @author Howard Lewis Ship
31  */
32 public class ResourceTranslator implements Translator
33 {
34     /**
35      * Finds the resource. If the inputValue is blank, then returns null.
36      * Interprets the inputValue as a relative path from the contributing module's descriptor.
37      * In addition, a localized resource will be returned if avaiable (localized to
38      * the {@link org.apache.hivemind.Registry#getLocale() registry's locale}.
39      *
40      */
41     public Object JavaDoc translate(
42         Module contributingModule,
43         Class JavaDoc propertyType,
44         String JavaDoc inputValue,
45         Location location)
46     {
47         if (HiveMind.isBlank(inputValue))
48             return null;
49
50         Locale JavaDoc locale = contributingModule.getLocale();
51
52         Resource descriptor = contributingModule.getLocation().getResource();
53
54         Resource baseResource = descriptor.getRelativeResource(inputValue);
55
56         Resource result = baseResource.getLocalization(locale);
57
58         if (result == null)
59             throw new ApplicationRuntimeException(
60                 RulesMessages.resourceLocalizationError(inputValue, contributingModule));
61
62         return result;
63     }
64
65 }
66
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