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


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.RequestDispatcher JavaDoc;
33 import javax.servlet.ServletException JavaDoc;
34 import javax.servlet.ServletRequest JavaDoc;
35 import javax.servlet.ServletResponse JavaDoc;
36 import javax.servlet.http.HttpServletRequest JavaDoc;
37 import java.io.IOException JavaDoc;
38
39 /**
40  * Does an internal forward of the request.
41  */
42 public class ForwardFilterChain implements FilterChain JavaDoc {
43   // servlet
44 private String JavaDoc _url;
45   private RequestDispatcher JavaDoc _disp;
46
47   /**
48    * Create the forward filter chain servlet.
49    *
50    * @param url the request dispatcher to forward to.
51    */
52   public ForwardFilterChain(String JavaDoc url)
53   {
54     _url = url;
55   }
56
57   /**
58    * Create the forward filter chain servlet.
59    *
60    * @param disp the request dispatcher to forward to.
61    */
62   public ForwardFilterChain(RequestDispatcher JavaDoc disp)
63   {
64     _disp = disp;
65   }
66
67   /**
68    * Forwards to the dispatch
69    *
70    * @param request the servlet request
71    * @param response the servlet response
72    */
73   public void doFilter(ServletRequest JavaDoc request,
74                        ServletResponse JavaDoc response)
75     throws ServletException JavaDoc, IOException JavaDoc
76   {
77     if (_disp != null)
78       _disp.forward(request, response);
79     else {
80       HttpServletRequest JavaDoc req = (HttpServletRequest JavaDoc) request;
81
82       RequestDispatcher JavaDoc disp = req.getRequestDispatcher(_url);
83
84       disp.forward(request, response);
85     }
86   }
87
88   public String JavaDoc toString()
89   {
90     if (_disp != null)
91       return "ForwardFilterChain[" + _disp + "]";
92     else
93       return "ForwardFilterChain[" + _url + "]";
94   }
95 }
96
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