ChainedLocaleResolver


1   /* ***** BEGIN LICENSE BLOCK *****
2    * Version: MPL 1.1
3    * The contents of this file are subject to the Mozilla Public License Version
4    * 1.1 (the "License"); you may not use this file except in compliance with
5    * the License. You may obtain a copy of the License at
6    * http://www.mozilla.org/MPL/
7    * 
8    * Software distributed under the License is distributed on an "AS IS" basis,
9    * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
10   * for the specific language governing rights and limitations under the
11   * License.
12   * 
13   * The Original Code is Riot.
14   * 
15   * The Initial Developer of the Original Code is
16   * Neteye GmbH.
17   * Portions created by the Initial Developer are Copyright (C) 2007
18   * the Initial Developer. All Rights Reserved.
19   * 
20   * Contributor(s):
21   *   flx
22   * 
23   * ***** END LICENSE BLOCK ***** */
24  package org.riotfamily.website.i18n;
25  
26  import java.util.Locale  ;
27  
28  import javax.servlet.http.HttpServletRequest  ;
29  import javax.servlet.http.HttpServletResponse  ;
30  
31  import org.springframework.util.Assert;
32  import org.springframework.web.servlet.LocaleResolver;
33  import org.springframework.web.servlet.i18n.AcceptHeaderLocaleResolver;
34  
35  /**
36   * @author Felix Gnass [fgnass at neteye dot de]
37   * @since 6.5
38   */
39  public abstract class ChainedLocaleResolver implements LocaleResolver {
40  
41      private LocaleResolver fallbackResolver = new AcceptHeaderLocaleResolver();
42      
43      public void setFallbackResolver(LocaleResolver fallbackResolver) {
44          Assert.notNull(fallbackResolver, "Fallback LocaleResolver must not be null");
45          this.fallbackResolver = fallbackResolver;
46      }
47  
48      public final Locale   resolveLocale(HttpServletRequest   request) {
49          Locale   locale = resolveLocaleInternal(request);
50          if (locale == null) {
51              locale = fallbackResolver.resolveLocale(request);
52          }
53          return locale;
54      }
55      
56      protected abstract Locale   resolveLocaleInternal(HttpServletRequest   request);
57      
58      public final void setLocale(HttpServletRequest   request, 
59              HttpServletResponse   response, Locale   locale) {
60          
61          if (!setLocaleInternal(request, response, locale)) {
62              fallbackResolver.setLocale(request, response, locale);
63          }
64      }
65      
66      protected boolean setLocaleInternal(HttpServletRequest   request, 
67              HttpServletResponse   response, Locale   locale) {
68      
69          return false;
70      }
71  }
72
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