ExpiresFilter


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.website.filter;
25  
26  import java.io.IOException  ;
27  
28  import javax.servlet.FilterChain  ;
29  import javax.servlet.ServletException  ;
30  import javax.servlet.http.HttpServletRequest  ;
31  import javax.servlet.http.HttpServletResponse  ;
32  
33  import org.riotfamily.common.util.FormatUtils;
34  import org.riotfamily.common.web.filter.HttpFilterBean;
35  
36  /**
37   * Servlet filter that sets an <code>Expires</code> header for each request.
38   */
39  public class ExpiresFilter extends HttpFilterBean {
40  
41      private static final String   HEADER_EXPIRES = "Expires";
42  
43      private long expiresAfter;
44      
45      public void setExpiresAfter(String   expires) {
46          this.expiresAfter = FormatUtils.parseMillis(expires);
47      }
48      
49      protected void filter(HttpServletRequest   request, HttpServletResponse   response, 
50              FilterChain   filterChain) throws IOException  , ServletException   {
51          
52          response.setDateHeader(HEADER_EXPIRES, 
53                  System.currentTimeMillis() + expiresAfter);
54          
55          filterChain.doFilter(request, response);
56      }
57  
58  }
59
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