1   /**
2    * Copyright (c) 2000-2007 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(HttpServletRequest req, HttpServletResponse res)
71          throws IOException, ServletException {
72  
73          String uri = req.getPathInfo();
74  
75          if ((uri == null) || (uri.length() == 0)) {
76              throw new ServletException("Path information is not specified");
77          }
78  
79          String[] paths = uri.split(StringPool.SLASH);
80  
81          if (paths.length < 2) {
82              throw new ServletException("Path " + uri + " is invalid");
83          }
84  
85          HttpServlet delegate = (HttpServlet)_delegates.get(paths[1]);
86  
87          if (delegate == null) {
88              throw new ServletException(
89                  "No servlet registred for context " + paths[1]);
90          }
91  
92          ClassLoader contextClassLoader =
93              Thread.currentThread().getContextClassLoader();
94  
95          try {
96              ClassLoader delegateClassLoader =
97                  delegate.getClass().getClassLoader();
98  
99              Thread.currentThread().setContextClassLoader(delegateClassLoader);
100 
101             delegate.service(req, res);
102         }
103         finally {
104             Thread.currentThread().setContextClassLoader(contextClassLoader);
105         }
106     }
107 
108     private static Map _delegates = new HashMap();
109 
110 }