MSRouteLoader.cpp

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/****************************************************************************/
// A class that performs the loading of routes
/****************************************************************************/
// SUMO, Simulation of Urban MObility; see http://sumo.sourceforge.net/
// Copyright 2001-2010 DLR (http://www.dlr.de/) and contributors
/****************************************************************************/
//
//   This program is free software; you can redistribute it and/or modify
//   it under the terms of the GNU General Public License as published by
//   the Free Software Foundation; either version 2 of the License, or
//   (at your option) any later version.
//
/****************************************************************************/

// ===========================================================================
// included modules
// ===========================================================================
#ifdef _MSC_VER
#include <windows_config.h>
#else
#include <config.h>
#endif

#include <string>
#include <utils/common/MsgHandler.h>
#include <utils/common/UtilExceptions.h>
#include <utils/xml/XMLSubSys.h>
#include "MSNet.h"
#include "MSRouteHandler.h"
#include "MSRouteLoader.h"

#ifdef CHECK_MEMORY_LEAKS
#include <foreign/nvwa/debug_new.h>
#endif // CHECK_MEMORY_LEAKS


// ===========================================================================
// method definitions
// ===========================================================================
MSRouteLoader::MSRouteLoader(MSNet &,
                             MSRouteHandler *handler)
        : myParser(0), myMoreAvailable(true), myHandler(handler) {
    myParser = XMLSubSys::getSAXReader(*myHandler);
}


MSRouteLoader::~MSRouteLoader() {
    delete myParser;
    delete myHandler;
}


void
MSRouteLoader::init() {
    myMoreAvailable = true;
    if (!myParser->parseFirst(myHandler->getFileName().c_str(), myToken)) {
        throw ProcessError("Can not read XML-file '" + myHandler->getFileName() + "'.");
    }
}


void
MSRouteLoader::loadUntil(SUMOTime time, MSEmitControl* into) {
    // read only when further data is available, no error occured
    //  and vehicles may be found in the between the departure time of
    //  the last read vehicle and the time to read until
    if (!myMoreAvailable || time+DELTA_T < myHandler->getLastDepart()) {
        return;
    }

    // if a vehicle was read before the call but was not yet added,
    //  add it now
    myHandler->retrieveLastReadVehicle(into);
    // read vehicles until specified time or the period to read vehicles
    //  until is reached
    while (myParser->parseNext(myToken)) {
        // return when the last read vehicle is beyond the period
        if (myHandler->getLastDepart()>=time) {
            return;
        }
        // otherwise add the last vehicle read (if any)
        myHandler->retrieveLastReadVehicle(into);
    }

    // no data are available anymore
    myMoreAvailable = false;
    return;
}


bool
MSRouteLoader::moreAvailable() const {
    return myMoreAvailable;
}



/****************************************************************************/