PluginChain


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.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  /**
34   * Acts like a {@link FilterChain}, just for FilterPlugins.
35   *  
36   * @author Felix Gnass [fgnass at neteye dot de]
37   * @since 6.4
38   */
39  public class PluginChain {
40  
41      private FilterChain   filterChain;
42      
43      private FilterPlugin[] plugins;
44      
45      private int nextPlugin = 0;
46      
47      public PluginChain(FilterChain   filterChain, FilterPlugin[] plugins) {
48          this.filterChain = filterChain;
49          this.plugins = plugins;
50      }
51  
52      public void doFilter(HttpServletRequest   request, 
53              HttpServletResponse   response) 
54              throws IOException  , ServletException   {
55          
56          if (nextPlugin < plugins.length) {
57              plugins[nextPlugin++].doFilter(request, response, this);
58          }
59          else {
60              filterChain.doFilter(request, response);
61          }
62      }
63  }
64
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