| PortalDelegatorServlet.java |
1 /**
2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20 * SOFTWARE.
21 */
22
23 package com.liferay.portal.kernel.servlet;
24
25 import com.liferay.portal.kernel.util.StringPool;
26
27 import java.io.IOException;
28
29 import java.util.HashMap;
30 import java.util.Map;
31
32 import javax.servlet.ServletException;
33 import javax.servlet.http.HttpServlet;
34 import javax.servlet.http.HttpServletRequest;
35 import javax.servlet.http.HttpServletResponse;
36
37 /**
38 * <a href="PortalDelegatorServlet.java.html"><b><i>View Source</i></b></a>
39 *
40 * <p>
41 * See http://support.liferay.com/browse/LEP-2297.
42 * </p>
43 *
44 * @author Olaf Fricke
45 * @author Brian Wing Shun Chan
46 *
47 */
48 public class PortalDelegatorServlet extends HttpServlet {
49
50 public static void addDelegate(String subContext, HttpServlet delegate) {
51 if (subContext == null) {
52 throw new IllegalArgumentException();
53 }
54
55 if (delegate == null) {
56 throw new IllegalArgumentException();
57 }
58
59 _delegates.put(subContext, delegate);
60 }
61
62 public static void removeDelegate(String subContext) {
63 if (subContext == null) {
64 throw new IllegalArgumentException();
65 }
66
67 _delegates.remove(subContext);
68 }
69
70 public void service(
71 HttpServletRequest request, HttpServletResponse response)
72 throws IOException, ServletException {
73
74 String uri = request.getPathInfo();
75
76 if ((uri == null) || (uri.length() == 0)) {
77 throw new ServletException("Path information is not specified");
78 }
79
80 String[] paths = uri.split(StringPool.SLASH);
81
82 if (paths.length < 2) {
83 throw new ServletException("Path " + uri + " is invalid");
84 }
85
86 HttpServlet delegate = _delegates.get(paths[1]);
87
88 if (delegate == null) {
89 throw new ServletException(
90 "No servlet registred for context " + paths[1]);
91 }
92
93 Thread currentThread = Thread.currentThread();
94
95 ClassLoader contextClassLoader = currentThread.getContextClassLoader();
96
97 try {
98 ClassLoader delegateClassLoader =
99 delegate.getClass().getClassLoader();
100
101 currentThread.setContextClassLoader(delegateClassLoader);
102
103 delegate.service(request, response);
104 }
105 finally {
106 currentThread.setContextClassLoader(contextClassLoader);
107 }
108 }
109
110 private static Map<String, HttpServlet> _delegates =
111 new HashMap<String, HttpServlet>();
112
113 }