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.InvocationTargetException;
35 import java.lang.reflect.Method;
37 import javax.servlet.http.HttpServletRequest;
38 import javax.servlet.http.HttpServletResponse;
40 import mir.log.LoggerWrapper;
44 * Dispatcher, calls the method passed to ServletModule Class, through the "do"
45 * Parameter (via POST or GET)
47 * @version $Id: ServletModuleDispatch.java,v 1.13 2003/03/06 05:40:39 zapata Exp $
52 public final class ServletModuleDispatch {
54 private static LoggerWrapper logger = new LoggerWrapper("ServletModule.Dispatch");
55 private static final Class[] SIGNATURE = { HttpServletRequest.class, HttpServletResponse.class };
58 * private constructor to prevent unwanted instantiation;
61 private ServletModuleDispatch () {
65 * Die Dispatch-Routine ruft das von dem Hauptservlet kommende ServletModule
66 * mit dem per HttpServletRequest angegebenen Paramter <code>do</code> auf.
67 * Ist kein Parameter angegeben, so wird versucht, in die <code>defaultAction</code>
68 * des ServletModules zu springen.
70 * @param req Http-Request, das vom Dispatcher an die Methode des
71 * ServletModules durchgereicht wird
72 * @param res Http-Response, die vom Dispatcher an die Methode des
73 * ServletModules durchgereicht wird
74 * @param sMod ServletModule, an das dispatched wird.
75 * @param mod Name des Modules als String (f?r Logfile)
78 public static void dispatch(ServletModule sMod, HttpServletRequest req,
79 HttpServletResponse res) throws ServletModuleExc, ServletModuleUserExc, ServletModuleFailure
81 //sMod.predeliver(req,res);
83 String doParam = req.getParameter("do");
84 logger.info("ServletModuleDispatch: " + sMod.toString() + " with method " + doParam);
85 if (doParam == null) {
86 if (sMod.defaultAction() != null)
87 doParam = sMod.defaultAction();
89 throw new ServletModuleExc("no parameter do supplied!");
93 Method method = sMod.getClass().getMethod(doParam,SIGNATURE);
95 method.invoke(sMod,new Object[] {req,res} );
98 else logger.debug("method lookup unsuccesful");
100 catch ( NoSuchMethodException e) {
101 throw new ServletModuleFailure("no such method '"+doParam+"' (" + e.getMessage() + ")", e);
103 catch ( SecurityException e) {
104 throw new ServletModuleFailure("method not allowed!" + e.getMessage(), e);
106 catch ( InvocationTargetException e) {
107 logger.debug( "invocation target exception: " + e.getMessage());
109 throw new ServletModuleFailure(e.getTargetException().getMessage(), e.getTargetException());
111 catch ( IllegalAccessException e) {
112 throw new ServletModuleFailure("illegal method not allowed!" + e.getMessage(), e);
114 catch (Throwable t) {
115 throw new ServletModuleFailure(t);