001 //$HeadURL: svn+ssh://rbezema@svn.wald.intevation.org/deegree/base/branches/2.2_testing/src/org/deegree/enterprise/control/RequestDispatcher.java $
002 /*---------------- FILE HEADER ------------------------------------------
003
004 This file is part of deegree.
005 Copyright (C) 2001-2008 by:
006 EXSE, Department of Geography, University of Bonn
007 http://www.giub.uni-bonn.de/deegree/
008 lat/lon GmbH
009 http://www.lat-lon.de
010
011 This library is free software; you can redistribute it and/or
012 modify it under the terms of the GNU Lesser General Public
013 License as published by the Free Software Foundation; either
014 version 2.1 of the License, or (at your option) any later version.
015
016 This library is distributed in the hope that it will be useful,
017 but WITHOUT ANY WARRANTY; without even the implied warranty of
018 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
019 Lesser General Public License for more details.
020
021 You should have received a copy of the GNU Lesser General Public
022 License along with this library; if not, write to the Free Software
023 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
024
025 Contact:
026
027 Andreas Poth
028 lat/lon GmbH
029 Aennchenstr. 19
030 53115 Bonn
031 Germany
032 E-Mail: poth@lat-lon.de
033
034 Prof. Dr. Klaus Greve
035 Department of Geography
036 University of Bonn
037 Meckenheimer Allee 166
038 53115 Bonn
039 Germany
040 E-Mail: greve@giub.uni-bonn.de
041
042
043 ---------------------------------------------------------------------------*/
044
045 package org.deegree.enterprise.control;
046
047 import java.io.File;
048 import java.io.IOException;
049
050 import javax.servlet.ServletConfig;
051 import javax.servlet.ServletException;
052 import javax.servlet.http.HttpServlet;
053 import javax.servlet.http.HttpServletRequest;
054 import javax.servlet.http.HttpServletResponse;
055
056 import org.deegree.enterprise.servlet.ServletRequestWrapper;
057
058 /**
059 * This is a <code>RequestDispatcher</code> which creates an event out of a GET or POST request.
060 *
061 * @author <a href="mailto:poth@lat-lon.de">Andreas Poth </a>
062 * @author last edited by: $Author: mays$
063 *
064 * @version $Revision: 9338 $ $Date: 2007-12-27 13:31:31 +0100 (Do, 27 Dez 2007) $
065 */
066 public class RequestDispatcher extends HttpServlet {
067
068 private static final long serialVersionUID = 1L;
069
070 private static String CONFIGURATION = "Handler.configFile";
071
072 protected transient ApplicationHandler appHandler = null;
073
074 /**
075 * This method initializes the servlet.
076 *
077 * @param cfg
078 * the servlet configuration
079 * @throws ServletException
080 * an exception
081 */
082 @Override
083 public void init( ServletConfig cfg )
084 throws ServletException {
085 super.init( cfg );
086
087 try {
088 String url = null;
089
090 String s = getInitParameter( CONFIGURATION );
091 if ( new File( s ).isAbsolute() ) {
092 url = s;
093 } else {
094 url = getServletContext().getRealPath( s );
095 }
096
097 this.appHandler = new ApplicationHandler( url );
098 } catch ( Exception e ) {
099 e.printStackTrace();
100 }
101 }
102
103 /**
104 *
105 * @param request
106 * @param response
107 * @throws ServletException
108 * @throws IOException
109 */
110 @Override
111 protected void service( HttpServletRequest request, HttpServletResponse response )
112 throws ServletException, IOException {
113 // Map<String, String[]> requestParameters= request.getParameterMap();
114 // FormEvent event = null;
115 // if( requestParameters.size() > 0 ){
116 // Map<String, String> params = new HashMap<String, String>();
117 // Set<String> keys = requestParameters.keySet();
118 // for( String key : keys){
119 // String[] values = requestParameters.get( key );
120 // //maybe put in more keys with _iterator appended?
121 // if( values.length >= 1 ){
122 // params.put( key, values[0] );
123 // }
124 // }
125 // event = new WebEvent( params );
126 // } else {
127 // event = new WebEvent( request.getInputStream() );
128 // }
129
130 // create event out of request
131 FormEvent event = createEvent( request );
132
133 // deliver event to application handler
134 deliverEvent( event );
135
136 // get next page from request attribute
137 String nextPage = (String) request.getAttribute( "next" );
138
139 // TODO: implement handling of attribute "alternativeNext" ! something like:
140 // if (next != null) { check whether the path points to an existing file. if not, use "alternativeNext"}
141
142 // show error page if next page is null or an error occured
143 nextPage = "/" + ( ( nextPage == null ) ? "error.jsp" : nextPage );
144
145 if ( request.getAttribute( "javax.servlet.jsp.jspException" ) != null ) {
146 nextPage = "/error.jsp";
147 }
148
149 // call request dispatcher
150 getServletConfig().getServletContext().getRequestDispatcher( nextPage ).forward( request, response );
151 event = null;
152 }
153
154 /**
155 *
156 * @param original
157 * request from the service
158 * @return a new WebEvent which wraps the request into a {@link ServletRequestWrapper}.
159 */
160 protected FormEvent createEvent( HttpServletRequest request ) {
161 return new WebEvent( new ServletRequestWrapper( request ) );
162 }
163
164 /**
165 *
166 * @param event
167 */
168 protected void deliverEvent( FormEvent event ) {
169 if ( appHandler == null ) {
170 try {
171 String url = null;
172
173 String s = getInitParameter( CONFIGURATION );
174 if ( new File( s ).isAbsolute() ) {
175 url = s;
176 } else {
177 url = getServletContext().getRealPath( s );
178 }
179
180 this.appHandler = new ApplicationHandler( url );
181 } catch ( Exception e ) {
182 e.printStackTrace();
183 }
184 }
185 this.appHandler.actionPerformed( event );
186 }
187 }