source: proiecte/ptvs/src/vnsim/applications/vitp/services/VehicleTraffic.java @ 31

/************************************************************************************
 * Copyright (C) 2008 by Politehnica University of Bucharest and Rutgers University
 * All rights reserved.
 * Refer to LICENSE for terms and conditions of use.
 ***********************************************************************************/
package vnsim.applications.vitp.services;


import java.util.*;

import vnsim.applications.trafficview.SimulatedCarInfo;
import vnsim.applications.vitp.utils.*;
import vnsim.core.*;



public class VehicleTraffic extends Service {

        //this is an example of a service
        
        SimulatedCarInfo info;

        public VehicleTraffic(SimulatedCarInfo info) {
                this.info=info;
        }

        public VITPRequest satisfy(VITPRequest req, HashMap params) {

                //takes the request, reduces the count field in the URI, and adds a line
                //in the message body, of the type "speed=40";
                //params is a map of parameters of the local node (among them should be 'speed')
                System.out.println("VehicleTraffic modifying a request!");
                double speed=info.getSpeed();

                try{
                        VITPRequest request=(VITPRequest) req;
                        req.addToBody("speed="+speed);
                        //reduce cnt by one
                        Vector<String> rcs=URIParser.getRCExpressions(request.getURI());
                        if(rcs==null) return req;
                        for(int i=0;i<rcs.size();i++){
                                if(((String)rcs.elementAt(i)).startsWith("cnt")) {
                                        String cntSir=(String)rcs.elementAt(i);
                                        int i1=cntSir.indexOf('=');
                                        if(i1==-1) return req;
                                        Integer old=new Integer(cntSir.substring(i1+1));
                                        int newcnt=old.intValue()-1;
                                        String newSir="cnt="+newcnt;
                                        rcs.removeElementAt(i);
                                        rcs.addElement(newSir);

                                        String oldUri=request.getURI();
                                        String newUri=URIParser.getURIFromParts(URIParser.getType(oldUri), URIParser.getTag(oldUri), 
                                                rcs, URIParser.getParams(oldUri));
                                        request.setURI(newUri);
                                        return request;
                                }
                        }
                        return req;
                } catch (Exception ex){
                        System.out.println("WARNING! EXCEPTION in VehicleTraffic:"+ex.toString());
                        return req;
                }
        }
}