LocaleRequestWrapper


1   package org.appfuse.webapp.filter;
2   
3   import java.util.Collections  ;
4   import java.util.Enumeration  ;
5   import java.util.List  ;
6   import java.util.Locale  ;
7   
8   import javax.servlet.http.HttpServletRequest  ;
9   import javax.servlet.http.HttpServletRequestWrapper  ;
10  
11  import org.apache.commons.logging.Log;
12  import org.apache.commons.logging.LogFactory;
13  
14  /**
15   * HttpRequestWrapper overriding methods getLocale(), getLocales() to include
16   * the user's preferred locale.
17   */
18  public class LocaleRequestWrapper extends HttpServletRequestWrapper   {
19      private final transient Log log = LogFactory.getLog(LocaleRequestWrapper.class);
20      private final Locale   preferredLocale;
21  
22      public LocaleRequestWrapper(HttpServletRequest   decorated, Locale   userLocale) {
23          super(decorated);
24          preferredLocale = userLocale;
25          if (null == preferredLocale) {
26              log.error("preferred locale = null, it is an unexpected value!");
27          }
28      }
29  
30      /**
31       * @see javax.servlet.ServletRequestWrapper#getLocale()
32       */
33      public Locale   getLocale() {
34          if (null != preferredLocale) {
35              return preferredLocale;
36          } else {
37              return super.getLocale();
38          }
39      }
40  
41      /**
42       * @see javax.servlet.ServletRequestWrapper#getLocales()
43       */
44      public Enumeration   getLocales() {
45          if (null != preferredLocale) {
46              List   l = Collections.list(super.getLocales());
47              if(l.contains(preferredLocale))
48              {
49                  l.remove(preferredLocale);
50              }
51              l.add(0, preferredLocale);
52              return Collections.enumeration(l);
53          } else {
54              return super.getLocales();
55          }
56      }
57  
58  }
59
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