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


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 import java.io.PrintWriter JavaDoc;
39
40 /**
41  * Represents the final servlet in a filter chain.
42  */
43 public class MovedFilterChain implements FilterChain JavaDoc {
44   private int _code;
45   private String JavaDoc _url;
46   private String JavaDoc _queryString;
47
48   /**
49    * Create the redirect filter chain servlet.
50    *
51    * @param url the URL to redirect to.
52    */
53   public MovedFilterChain(int code, String JavaDoc url)
54   {
55     _code = code;
56     _url = url;
57   }
58
59   /**
60    * Create the redirect filter chain servlet.
61    *
62    * @param url the URL to redirect to.
63    */
64   public MovedFilterChain(int code, String JavaDoc url, String JavaDoc queryString)
65   {
66     _code = code;
67     _url = url;
68     _queryString = queryString;
69   }
70   
71   /**
72    * Invokes the final servlet at the end of the chain.
73    *
74    * @param request the servlet request
75    * @param response the servlet response
76    *
77    * @since Servlet 2.3
78    */
79   public void doFilter(ServletRequest JavaDoc request,
80                        ServletResponse JavaDoc response)
81     throws ServletException JavaDoc, IOException JavaDoc
82   {
83     HttpServletRequest JavaDoc req = (HttpServletRequest JavaDoc) request;
84     HttpServletResponse JavaDoc res = (HttpServletResponse JavaDoc) response;
85
86     String JavaDoc queryString = _queryString;
87
88     if (queryString == null)
89       queryString = req.getQueryString();
90
91     String JavaDoc url;
92
93     if (queryString != null && _url.indexOf('?') < 0)
94       url = res.encodeURL(_url + '?' + queryString);
95     else
96       url = res.encodeURL(_url);
97
98     res.setHeader("Location", url);
99
100     res.setStatus(_code);
101
102     PrintWriter JavaDoc out = response.getWriter();
103
104     out.println("The URL has moved to <a HREF=\"" + url + "\">" + url + "</a>");
105   }
106 }
107
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