ResourceStamper


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) 2006
18   * the Initial Developer. All Rights Reserved.
19   * 
20   * Contributor(s):
21   *   Felix Gnass [fgnass at neteye dot de]
22   * 
23   * ***** END LICENSE BLOCK ***** */
24  package org.riotfamily.common.web.filter;
25  
26  import java.text.SimpleDateFormat  ;
27  import java.util.Date  ;
28  
29  import org.springframework.beans.factory.InitializingBean;
30  
31  /**
32   * Utility class that can be used to add a timestamp to a URL.
33   * 
34   * @see CacheStampedResourcesFilter
35   * @see org.riotfamily.website.css.CssTemplateController
36   * @author Felix Gnass [fgnass at neteye dot de]
37   * @since 6.4
38   */
39  public class ResourceStamper implements InitializingBean {
40      
41      public static final String   DFAULT_TIME_PATTERN = "ddHHmm";
42  
43      private String   timePattern = DFAULT_TIME_PATTERN;
44      
45      private String   time;
46      
47      public void setTimePattern(String   timePattern) {
48          this.timePattern = timePattern;
49      }
50      
51      public void afterPropertiesSet() throws Exception   {
52          SimpleDateFormat   df = new SimpleDateFormat  (timePattern);
53          time = "?" + df.format(new Date  ());
54      }
55      
56      public String   stamp(String   url) {
57          if (url.indexOf('?') == -1) {
58              url += time;
59          }
60          return url;
61      }
62  
63  }
64
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