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1   /*
2    * $Id: DefaultLocaleResolver.java 529532 2007-04-17 08:58:03Z apetrelli $
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   * http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  package org.apache.tiles.locale.impl;
22  
23  import java.util.Locale;
24  import java.util.Map;
25  
26  import org.apache.tiles.TilesException;
27  import org.apache.tiles.context.TilesRequestContext;
28  import org.apache.tiles.locale.LocaleResolver;
29  
30  /***
31   * Default implementation of <code>LocaleResolver</code><br>
32   * It tries to take the locale from the session-scoped attribute
33   * {@link DefaultLocaleResolver#LOCALE_KEY}. If it is not found, it returns the
34   * locale included in the request.
35   *
36   * @version $Rev: 529532 $ $Date: 2007-04-17 10:58:03 +0200 (Tue, 17 Apr 2007) $
37   */
38  public class DefaultLocaleResolver implements LocaleResolver {
39  
40      /***
41       * The attribute name that is used to store the current locale.
42       */
43      public static final String LOCALE_KEY = "org.apache.tiles.LOCALE";
44  
45      /*** {@inheritDoc} */
46      public void init(Map<String, String> params)
47              throws TilesException {
48          // Does nothing.
49      }
50  
51      /*** {@inheritDoc} */
52      public Locale resolveLocale(TilesRequestContext request) {
53          Locale retValue = null;
54          Map<String, Object> session = request.getSessionScope();
55          if (session != null) {
56              retValue = (Locale) session.get(DefaultLocaleResolver.LOCALE_KEY);
57          }
58          if (retValue == null) {
59              retValue = request.getRequestLocale();
60          }
61  
62          return retValue;
63      }
64  }