001    //$HeadURL: svn+ssh://jwilden@svn.wald.intevation.org/deegree/base/branches/2.5_testing/src/org/deegree/enterprise/control/RPCWebEvent.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    package org.deegree.enterprise.control;
037    
038    import java.io.BufferedReader;
039    import java.io.StringReader;
040    
041    import javax.servlet.ServletRequest;
042    import javax.servlet.http.HttpServletRequest;
043    
044    /**
045     * @author Administrator
046     */
047    
048    public class RPCWebEvent extends WebEvent {
049    
050        /**
051         *
052         */
053        private static final long serialVersionUID = 1L;
054    
055        /**
056         *
057         */
058        private RPCMethodCall mc = null;
059    
060        /** Creates a new instance of RPCWebEvent */
061        public RPCWebEvent( HttpServletRequest request ) {
062            super( request );
063        }
064    
065        /** Creates a new instance of RPCWebEvent */
066        public RPCWebEvent( HttpServletRequest request, RPCMethodCall mc ) {
067            super( request );
068            this.mc = mc;
069        }
070    
071        /** Creates a new instance of RPCWebEvent */
072        public RPCWebEvent( FormEvent parent, RPCMethodCall mc ) {
073            super( (HttpServletRequest) parent.getSource() );
074            this.mc = mc;
075        }
076    
077        /**
078         * returns the the RPC methodcall extracted from the <tt>HttpServletRequest</tt> passed to the
079         * first constructor.
080         */
081        public RPCMethodCall getRPCMethodCall() {
082            if ( mc == null ) {
083                try {
084                    mc = getMethodCall( (ServletRequest) this.getSource() );
085                } catch ( Exception e ) {
086                    e.printStackTrace();
087                }
088            }
089            return mc;
090        }
091    
092        /**
093         * extracts the RPC method call from the
094         *
095         * @param request
096         * @throws RPCException
097         */
098        private RPCMethodCall getMethodCall( ServletRequest request )
099                                throws RPCException {
100    
101            StringBuffer sb = new StringBuffer( 1000 );
102            try {
103                BufferedReader br = request.getReader();
104                String line = null;
105                while ( ( line = br.readLine() ) != null ) {
106                    sb.append( line );
107                }
108                br.close();
109            } catch ( Exception e ) {
110                throw new RPCException( "Error reading stream from servlet\n" + e.toString() );
111            }
112    
113            String s = sb.toString();
114            int pos1 = s.indexOf( "<methodCall>" );
115            int pos2 = s.indexOf( "</methodCall>" );
116            if ( pos1 < 0 ) {
117                throw new RPCException( "request doesn't contain a RPC methodCall" );
118            }
119            s = s.substring( pos1, pos2 + 13 );
120    
121            StringReader reader = new StringReader( s );
122            RPCMethodCall mc = RPCFactory.createRPCMethodCall( reader );
123    
124            return mc;
125        }
126    }