001 //$HeadURL: svn+ssh://rbezema@svn.wald.intevation.org/deegree/base/tags/2.1/src/org/deegree/enterprise/control/RequestDispatcher.java $
002 /*---------------- FILE HEADER ------------------------------------------
003
004 This file is part of deegree.
005 Copyright (C) 2001-2006 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 a event out of a GET
060 * or POST requests.
061 * <P>
062 *
063 * @author <a href="mailto:poth@lat-lon.de">Andreas Poth </a>
064 *
065 * @version $Revision: 7335 $ $Date: 2007-05-29 11:43:53 +0200 (Di, 29 Mai 2007) $
066 */
067 public class RequestDispatcher extends HttpServlet {
068
069 private static final long serialVersionUID = 1L;
070
071 private static String CONFIGURATION = "Handler.configFile";
072
073 protected transient ApplicationHandler appHandler = null;
074
075 /**
076 * This method initializes the servlet.
077 *
078 * @param cfg
079 * the servlet configuration
080 *
081 * @throws ServletException
082 * an exception
083 */
084 @Override
085 public void init( ServletConfig cfg )
086 throws ServletException {
087 super.init( cfg );
088
089 try {
090 String url = null;
091
092 String s = getInitParameter( CONFIGURATION );
093 if ( new File( s ).isAbsolute() ) {
094 url = s;
095 } else {
096 url = getServletContext().getRealPath( s );
097 }
098
099 this.appHandler = new ApplicationHandler( url );
100 } catch ( Exception e ) {
101 e.printStackTrace();
102 }
103 }
104
105 /**
106 *
107 *
108 * @param request
109 * @param response
110 *
111 * @throws ServletException
112 * @throws IOException
113 */
114 @Override
115 protected void service( HttpServletRequest request, HttpServletResponse response )
116 throws ServletException, IOException {
117 // Map<String, String[]> requestParameters= request.getParameterMap();
118 // FormEvent event = null;
119 // if( requestParameters.size() > 0 ){
120 // Map<String, String> params = new HashMap<String, String>();
121 // Set<String> keys = requestParameters.keySet();
122 // for( String key : keys){
123 // String[] values = requestParameters.get( key );
124 // //maybe put in more keys with _iterator appended?
125 // if( values.length >= 1 ){
126 // params.put( key, values[0] );
127 // }
128 // }
129 // event = new WebEvent( params );
130 // } else {
131 // event = new WebEvent( request.getInputStream() );
132 // }
133
134 // create event out of request
135 FormEvent event = createEvent( request );
136
137 // deliver event to application handler
138 deliverEvent( event );
139
140 // get next page from request attribute
141 String nextPage = (String) request.getAttribute( "next" );
142
143 // show error page if next page is null or an error occured
144 nextPage = "/" + ( ( nextPage == null ) ? "error.jsp" : nextPage );
145
146 if ( request.getAttribute( "javax.servlet.jsp.jspException" ) != null ) {
147 nextPage = "/error.jsp";
148 }
149
150 // call request dispatcher
151 getServletConfig().getServletContext().getRequestDispatcher( nextPage ).forward( request,
152 response );
153 event = null;
154 }
155
156 /**
157 *
158 *
159 * @param original request from the service
160 *
161 * @return a new WebEvent which wraps the request into a {@link ServletRequestWrapper}.
162 */
163 protected FormEvent createEvent( HttpServletRequest request ) {
164 return new WebEvent( new ServletRequestWrapper( request ) );
165 }
166
167 /**
168 *
169 *
170 * @param event
171 */
172 protected void deliverEvent( FormEvent event ) {
173 if ( appHandler == null ) {
174 try {
175 String url = null;
176
177 String s = getInitParameter( CONFIGURATION );
178 if ( new File( s ).isAbsolute() ) {
179 url = s;
180 } else {
181 url = getServletContext().getRealPath( s );
182 }
183
184 this.appHandler = new ApplicationHandler( url );
185 } catch ( Exception e ) {
186 e.printStackTrace();
187 }
188 }
189 this.appHandler.actionPerformed( event );
190 }
191 }