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Java > Open Source Codes > com > caucho > server > dispatch > RedirectFilterChain


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */

28
29 package com.caucho.server.dispatch;
30
31 import javax.servlet.FilterChain JavaDoc;
32 import javax.servlet.ServletException JavaDoc;
33 import javax.servlet.ServletRequest JavaDoc;
34 import javax.servlet.ServletResponse JavaDoc;
35 import javax.servlet.http.HttpServletRequest JavaDoc;
36 import javax.servlet.http.HttpServletResponse JavaDoc;
37 import java.io.IOException JavaDoc;
38
39 /**
40  * Represents the final servlet in a filter chain.
41  */

42 public class RedirectFilterChain implements FilterChain JavaDoc {
43   // servlet
44
private String JavaDoc _url;
45   private String JavaDoc _queryString;
46
47   /**
48    * Create the redirect filter chain servlet.
49    *
50    * @param url the URL to redirect to.
51    */

52   public RedirectFilterChain(String JavaDoc url)
53   {
54     _url = url;
55   }
56
57   /**
58    * Create the redirect filter chain servlet.
59    *
60    * @param url the URL to redirect to.
61    */

62   public RedirectFilterChain(String JavaDoc url, String JavaDoc queryString)
63   {
64     _url = url;
65     _queryString = queryString;
66   }
67   
68   /**
69    * Invokes the final servlet at the end of the chain.
70    *
71    * @param request the servlet request
72    * @param response the servlet response
73    *
74    * @since Servlet 2.3
75    */

76   public void doFilter(ServletRequest JavaDoc request,
77                        ServletResponse JavaDoc response)
78     throws ServletException JavaDoc, IOException JavaDoc
79   {
80     HttpServletRequest JavaDoc req = (HttpServletRequest JavaDoc) request;
81     HttpServletResponse JavaDoc res = (HttpServletResponse JavaDoc) response;
82
83     String JavaDoc queryString = _queryString;
84
85     if (queryString == null)
86       queryString = req.getQueryString();
87
88     if (queryString != null && _url.indexOf('?') < 0)
89       res.sendRedirect(res.encodeURL(_url + '?' + queryString));
90     else
91       res.sendRedirect(res.encodeURL(_url));
92   }
93 }
94
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