ResourceHelper


1   /*
2    * Copyright 1999,2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */ 
16  
17  package org.apache.taglibs.i18n;
18  
19  import java.util.ArrayList  ;
20  import java.util.Iterator  ;
21  import java.util.List  ;
22  import java.util.Locale  ;
23  import java.util.ResourceBundle  ;
24  import java.util.StringTokenizer  ;
25  
26  import javax.servlet.ServletRequest  ;
27  
28  import javax.servlet.jsp.PageContext  ;
29  import javax.servlet.jsp.tagext.BodyTagSupport  ;
30  
31  
32  /**
33   *  This class is used by the bundle and message tags for caching the
34   *  ResourceBundle in the session and request.
35   *
36   *  @author <a HREF="mailto:tdawson@wamnet.com">Tim Dawson</a>
37   *
38   */
39  public class ResourceHelper
40  {
41      public static final String   BUNDLE_REQUEST_KEY =
42            "org.apache.taglibs.i18n.ResourceHelper.Bundle";
43  
44      /**
45       *  Retrieves the bundle cached in the page by a previous call to
46       *  getBundle(PageContext,String).  This is used by the MessageTag since
47       *  the bundle name is provided once, by the BundleTag.
48       *  @return java.util.ResourceBundle the cached bundle
49       */
50      static public ResourceBundle   getBundle(PageContext   pageContext)
51      {
52          return (ResourceBundle  )pageContext.findAttribute(BUNDLE_REQUEST_KEY);
53      }
54  
55      /**
56       *  Caches the Bundle in the request using the BUNDLE_REQUEST_KEY.
57       */
58      static public void setBundle(PageContext   pageContext,
59                                   ResourceBundle   bundle,
60                                   int scope)
61      {
62          // put this in the page so that the getMessage tag can get it quickly
63          pageContext.setAttribute(BUNDLE_REQUEST_KEY,bundle,scope);
64      }
65    
66  }
67
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