    001    //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/branches/2.4_testing/src/org/deegree/enterprise/control/RequestDispatcher.java $
    002    /*----------------------------------------------------------------------------
    003     This file is part of deegree, http://deegree.org/
    004     Copyright (C) 2001-2009 by:
    005       Department of Geography, University of Bonn
    006     and
    007       lat/lon GmbH
    008
    009     This library is free software; you can redistribute it and/or modify it under
    010     the terms of the GNU Lesser General Public License as published by the Free
    011     Software Foundation; either version 2.1 of the License, or (at your option)
    012     any later version.
    013     This library is distributed in the hope that it will be useful, but WITHOUT
    014     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    015     FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
    016     details.
    017     You should have received a copy of the GNU Lesser General Public License
    018     along with this library; if not, write to the Free Software Foundation, Inc.,
    019     59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    020
    021     Contact information:
    022
    023     lat/lon GmbH
    024     Aennchenstr. 19, 53177 Bonn
    025     Germany
    026     http://lat-lon.de/
    027
    028     Department of Geography, University of Bonn
    029     Prof. Dr. Klaus Greve
    030     Postfach 1147, 53001 Bonn
    031     Germany
    032     http://www.geographie.uni-bonn.de/deegree/
    033
    034     e-mail: info@deegree.org
    035    ----------------------------------------------------------------------------*/
    036
    037    package org.deegree.enterprise.control;
    038
    039    import java.io.File;
    040    import java.io.IOException;
    041
    042    import javax.servlet.ServletConfig;
    043    import javax.servlet.ServletException;
    044    import javax.servlet.http.HttpServlet;
    045    import javax.servlet.http.HttpServletRequest;
    046    import javax.servlet.http.HttpServletResponse;
    047
    048    import org.deegree.enterprise.servlet.ServletRequestWrapper;
    049
    050    /**
    051     * This is a <code>RequestDispatcher</code> which creates an event out of a GET or POST request.
    052     *
    053     * @author <a href="mailto:poth@lat-lon.de">Andreas Poth </a>
    054     * @author last edited by: $Author: mays$
    055     *
    056     * @version $Revision: 18195 $ $Date: 2009-06-18 17:55:39 +0200 (Do, 18. Jun 2009) $
    057     */
    058    public class RequestDispatcher extends HttpServlet {
    059
    060        private static final long serialVersionUID = 1L;
    061
    062        private static String CONFIGURATION = "Handler.configFile";
    063
    064        /** */
    065        protected transient ApplicationHandler appHandler = null;
    066
    067        /**
    068         * This method initializes the servlet.
    069         *
    070         * @param cfg
    071         *            the servlet configuration
    072         * @throws ServletException
    073         *             an exception
    074         */
    075        @Override
    076        public void init( ServletConfig cfg )
    077                                throws ServletException {
    078            super.init( cfg );
    079
    080            try {
    081                String url = null;
    082
    083                String s = getInitParameter( CONFIGURATION );
    084                if ( new File( s ).isAbsolute() ) {
    085                    url = s;
    086                } else {
    087                    url = getServletContext().getRealPath( s );
    088                }
    089
    090                this.appHandler = new ApplicationHandler( url );
    091            } catch ( Exception e ) {
    092                e.printStackTrace();
    093            }
    094        }
    095
    096        /**
    097         *
    098         * @param request
    099         * @param response
    100         * @throws ServletException
    101         * @throws IOException
    102         */
    103        @Override
    104        protected void service( HttpServletRequest request, HttpServletResponse response )
    105                                throws ServletException, IOException {
    106            // Map<String, String[]> requestParameters= request.getParameterMap();
    107            // FormEvent event = null;
    108            // if( requestParameters.size() > 0 ){
    109            // Map<String, String> params = new HashMap<String, String>();
    110            // Set<String> keys = requestParameters.keySet();
    111            // for( String key : keys){
    112            // String[] values = requestParameters.get( key );
    113            // //maybe put in more keys with _iterator appended?
    114            // if( values.length >= 1 ){
    115            // params.put( key, values[0] );
    116            // }
    117            // }
    118            // event = new WebEvent( params );
    119            // } else {
    120            // event = new WebEvent( request.getInputStream() );
    121            // }
    122
    123            // create event out of request
    124            FormEvent event = createEvent( request );
    125
    126            // deliver event to application handler
    127            deliverEvent( event );
    128
    129            // get next page from request attribute
    130            String nextPage = (String) request.getAttribute( "next" );
    131
    132            // TODO: implement handling of attribute "alternativeNext" ! something like:
    133            // if (next != null) { check whether the path points to an existing file. if not, use
    134            // "alternativeNext"}
    135
    136            // show error page if next page is null or an error occured
    137            nextPage = "/" + ( ( nextPage == null ) ? "error.jsp" : nextPage );
    138
    139            if ( request.getAttribute( "javax.servlet.jsp.jspException" ) != null ) {
    140                nextPage = "/error.jsp";
    141            }
    142
    143            // call request dispatcher
    144            getServletConfig().getServletContext().getRequestDispatcher( nextPage ).forward( request, response );
    145            event = null;
    146        }
    147
    148        /**
    149         *
    150         * @param request
    151         *            request from the service
    152         * @return a new WebEvent which wraps the request into a {@link ServletRequestWrapper}.
    153         */
    154        protected FormEvent createEvent( HttpServletRequest request ) {
    155            return new WebEvent( new ServletRequestWrapper( request ) );
    156        }
    157
    158        /**
    159         *
    160         * @param event
    161         */
    162        protected void deliverEvent( FormEvent event ) {
    163            if ( appHandler == null ) {
    164                try {
    165                    String url = null;
    166
    167                    String s = getInitParameter( CONFIGURATION );
    168                    if ( new File( s ).isAbsolute() ) {
    169                        url = s;
    170                    } else {
    171                        url = getServletContext().getRealPath( s );
    172                    }
    173
    174                    this.appHandler = new ApplicationHandler( url );
    175                } catch ( Exception e ) {
    176                    e.printStackTrace();
    177                }
    178            }
    179            this.appHandler.actionPerformed( event );
    180        }
    181    }