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


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 java.io.IOException JavaDoc;
36
37 /**
38  * Represents the next filter in a filter chain. The final filter will
39  * be the servlet itself.
40  */
41 public class ClassLoaderFilterChain implements FilterChain JavaDoc {
42   // Loader to use.
43 private final ClassLoader JavaDoc _loader;
44   private final FilterChain JavaDoc _next;
45
46   /**
47    * Creates a new FilterChainFilter.
48    *
49    * @param next the next filterChain
50    * @param filter the user's filter
51    */
52   public ClassLoaderFilterChain(FilterChain JavaDoc next, ClassLoader JavaDoc loader)
53   {
54     _next = next;
55     _loader = loader;
56   }
57   
58   /**
59    * Invokes the next filter in the chain or the final servlet at
60    * the end of the chain.
61    *
62    * @param request the servlet request
63    * @param response the servlet response
64    * @since Servlet 2.3
65    */
66   public void doFilter(ServletRequest JavaDoc request,
67                        ServletResponse JavaDoc response)
68     throws ServletException JavaDoc, IOException JavaDoc
69   {
70     Thread JavaDoc thread = Thread.currentThread();
71     ClassLoader JavaDoc oldLoader = thread.getContextClassLoader();
72
73     try {
74       thread.setContextClassLoader(_loader);
75
76       _next.doFilter(request, response);
77     } finally {
78       thread.setContextClassLoader(oldLoader);
79     }
80   }
81 }
82
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