2 * Copyright (C) 2001, 2002 The Mir-coders group
4 * This file is part of Mir.
6 * Mir is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * Mir is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with Mir; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * In addition, as a special exception, The Mir-coders gives permission to link
21 * the code of this program with the com.oreilly.servlet library, any library
22 * licensed under the Apache Software License, The Sun (tm) Java Advanced
23 * Imaging library (JAI), The Sun JIMI library (or with modified versions of
24 * the above that use the same license as the above), and distribute linked
25 * combinations including the two. You must obey the GNU General Public
26 * License in all respects for all of the code used other than the above
27 * mentioned libraries. If you modify this file, you may extend this exception
28 * to your version of the file, but you are not obligated to do so. If you do
29 * not wish to do so, delete this exception statement from your version.
34 import java.lang.reflect.*;
35 import javax.servlet.http.*;
36 import mir.servlet.ServletModuleException;
42 * Dispatcher, calls the method passed to ServletModule Class, through the "do"
43 * Parameter (via POST or GET)
45 * @version $Id: ServletModuleDispatch.java,v 1.10 2002/11/30 19:45:56 zapata Exp $
50 public final class ServletModuleDispatch {
52 private static LoggerWrapper logger = new LoggerWrapper("ServletModule.Dispatch");
53 private static final Class[] SIGNATURE = { HttpServletRequest.class, HttpServletResponse.class };
56 * private constructor to prevent unwanted instantiation;
59 private ServletModuleDispatch () {
63 * Die Dispatch-Routine ruft das von dem Hauptservlet kommende ServletModule
64 * mit dem per HttpServletRequest angegebenen Paramter <code>do</code> auf.
65 * Ist kein Parameter angegeben, so wird versucht, in die <code>defaultAction</code>
66 * des ServletModules zu springen.
68 * @param req Http-Request, das vom Dispatcher an die Methode des
69 * ServletModules durchgereicht wird
70 * @param res Http-Response, die vom Dispatcher an die Methode des
71 * ServletModules durchgereicht wird
72 * @param sMod ServletModule, an das dispatched wird.
73 * @param mod Name des Modules als String (für Logfile)
76 public static void dispatch(ServletModule sMod, HttpServletRequest req,
77 HttpServletResponse res) throws ServletModuleException, ServletModuleUserException
79 //sMod.predeliver(req,res);
81 String doParam = req.getParameter("do");
82 logger.info("ServletModuleDispatch: " + sMod.toString() + " with method " + doParam);
83 if (doParam == null) {
84 if (sMod.defaultAction() != null)
85 doParam = sMod.defaultAction();
87 throw new ServletModuleException("no parameter do supplied!");
91 Method method = sMod.getClass().getMethod(doParam,SIGNATURE);
93 method.invoke(sMod,new Object[] {req,res} );
96 else logger.debug("method lookup unsuccesful");
98 catch ( NoSuchMethodException e) {
99 throw new ServletModuleException("no such method '"+doParam+"' (" + e.getMessage() + ")");
101 catch ( SecurityException e) {
102 throw new ServletModuleException("method not allowed!" + e.getMessage());
104 catch ( InvocationTargetException e) {
105 System.out.println(e.getMessage());
106 if (e.getTargetException() instanceof ServletModuleUserException) {
107 throw new ServletModuleUserException(e.getTargetException().getMessage());
111 throw new ServletModuleException(e.getTargetException().getMessage());
114 catch ( IllegalAccessException e) {
115 throw new ServletModuleException("illegal method not allowed!" + e.getMessage());
118 //hopefully we don't get here ...
119 throw new ServletModuleException("delivery failed! -- ");