/*---------------- FILE HEADER ------------------------------------------
This file is part of deegree.
Copyright (C) 2001-2006 by:
EXSE, Department of Geography, University of Bonn
http://www.giub.uni-bonn.de/deegree/
lat/lon GmbH
http://www.lat-lon.de
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Contact:
Andreas Poth
lat/lon GmbH
Aennchenstr. 19
53115 Bonn
Germany
E-Mail: poth@lat-lon.de
Prof. Dr. Klaus Greve
Department of Geography
University of Bonn
Meckenheimer Allee 166
53115 Bonn
Germany
E-Mail: greve@giub.uni-bonn.de
---------------------------------------------------------------------------*/
package org.deegree.enterprise.control;
import java.io.File;
import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.deegree.enterprise.servlet.ServletRequestWrapper;
/**
* This is a <code>RequestDispatcher</code> which creates a event out of a GET
* or POST requests.
* <P>
*
* @author <a href="mailto:poth@lat-lon.de">Andreas Poth </a>
*
* @version $Revision: 1.13 $ $Date: 2006/05/23 14:26:57 $
*/
public class RequestDispatcher extends HttpServlet {
private static final long serialVersionUID = 1L;
private static String CONFIGURATION = "Handler.configFile";
protected transient ApplicationHandler appHandler = null;
/**
* This method initializes the servlet.
*
* @param cfg
* the servlet configuration
*
* @throws ServletException
* an exception
*/
public void init( ServletConfig cfg )
throws ServletException {
super.init( cfg );
try {
String url = null;
String s = getInitParameter( CONFIGURATION );
if ( new File( s ).isAbsolute() ) {
url = s;
} else {
url = getServletContext().getRealPath( s );
}
this.appHandler = new ApplicationHandler( url );
} catch ( Exception e ) {
e.printStackTrace();
}
}
/**
*
*
* @param request
* @param response
*
* @throws ServletException
* @throws IOException
*/
protected void service( HttpServletRequest request, HttpServletResponse response )
throws ServletException, IOException {
// create event out of request
FormEvent _event = createEvent( request );
// deliver event to application handler
deliverEvent( _event );
// get next page from request attribute
String nextPage = (String) request.getAttribute( "next" );
// show error page if next page is null or an error occured
nextPage = "/" + ( ( nextPage == null ) ? "error.jsp" : nextPage );
if ( request.getAttribute( "javax.servlet.jsp.jspException" ) != null ) {
nextPage = "/error.jsp";
}
// call request dispatcher
getServletConfig().getServletContext().getRequestDispatcher( nextPage ).forward( request,
response );
_event = null;
}
/**
*
*
* @param request
*
* @return
*/
protected FormEvent createEvent( HttpServletRequest request ) {
return new WebEvent( new ServletRequestWrapper( request ) );
}
/**
*
*
* @param event
*/
protected void deliverEvent( FormEvent event ) {
if ( appHandler == null ) {
try {
String url = null;
String s = getInitParameter( CONFIGURATION );
if ( new File( s ).isAbsolute() ) {
url = s;
} else {
url = getServletContext().getRealPath( s );
}
this.appHandler = new ApplicationHandler( url );
} catch ( Exception e ) {
e.printStackTrace();
}
}
this.appHandler.actionPerformed( event );
}
}
/*
* Changes to this class. What the people haven been up to: $Log:
* RequestDispatcher.java,v $ Revision 1.2 2005/01/18 22:08:54 poth no message
*
* Revision 1.2 2004/07/21 06:16:00 ap no message
*
* Revision 1.1 2004/06/08 13:03:20 tf refactor to org.deegree.enterprise
*
* Revision 1.1 2004/05/24 07:00:03 ap no message
*
* Revision 1.2 2004/01/03 13:46:45 poth no message
*
* Revision 1.1 2003/07/11 12:47:10 poth no message
*
* Revision 1.1.1.1 2002/03/22 15:23:10 ap no message
*
*/