01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * 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;
32: import javax.servlet.ServletException;
33: import javax.servlet.ServletRequest;
34: import javax.servlet.ServletResponse;
35: import java.io.IOException;
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 {
42: // Loader to use.
43: private final ClassLoader _loader;
44: private final FilterChain _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 next, ClassLoader loader) {
53: _next = next;
54: _loader = loader;
55: }
56:
57: /**
58: * Invokes the next filter in the chain or the final servlet at
59: * the end of the chain.
60: *
61: * @param request the servlet request
62: * @param response the servlet response
63: * @since Servlet 2.3
64: */
65: public void doFilter(ServletRequest request,
66: ServletResponse response) throws ServletException,
67: IOException {
68: Thread thread = Thread.currentThread();
69: ClassLoader oldLoader = thread.getContextClassLoader();
70:
71: try {
72: thread.setContextClassLoader(_loader);
73:
74: _next.doFilter(request, response);
75: } finally {
76: thread.setContextClassLoader(oldLoader);
77: }
78: }
79: }
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