/data/refman/pasoursint/CMSSW_5_3_6/src/GeneratorInterface/ThePEGInterface/plugins/ThePEGHadronisation.cc

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#include <string>
#include <iostream>
#include <sstream>
#include <memory>
#include <assert.h>

#include <boost/shared_ptr.hpp>

#include <HepMC/GenEvent.h>
#include <HepMC/GenParticle.h>
#include <HepMC/PdfInfo.h>

#include <ThePEG/Repository/Repository.h>
#include <ThePEG/EventRecord/Event.h>
#include <ThePEG/Config/ThePEG.h>
#include <ThePEG/LesHouches/LesHouchesReader.h>

#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/Framework/interface/Event.h"

#include "SimDataFormats/GeneratorProducts/interface/LesHouches.h"
#include "SimDataFormats/GeneratorProducts/interface/HepMCProduct.h"

#include "GeneratorInterface/LHEInterface/interface/LHERunInfo.h"
#include "GeneratorInterface/LHEInterface/interface/LHEEvent.h"
#include "GeneratorInterface/LHEInterface/interface/LHEProxy.h"
#include "GeneratorInterface/LHEInterface/interface/Hadronisation.h"

#include "GeneratorInterface/ThePEGInterface/interface/ThePEGInterface.h"

using namespace std;
using namespace ThePEG;
using namespace lhef;

namespace lhef {

class ThePEGHadronisation : public ThePEGInterface, public Hadronisation {
    public:
        ThePEGHadronisation(const edm::ParameterSet &params);
        ~ThePEGHadronisation();

    private:
        void doInit();
        std::auto_ptr<HepMC::GenEvent> doHadronisation();
        void newRunInfo(const boost::shared_ptr<LHERunInfo> &runInfo);

        void initLHE();

        boost::shared_ptr<LHEProxy>     proxy_;

        const std::string               handlerDirectory_;
};

void ThePEGHadronisation::initLHE()
{
        ostringstream ss;
        ss << proxy_->getID();

        ostringstream logstream;
        ThePEG::Repository::exec("set " + handlerDirectory_ +
                                 "/LHEReader:ProxyID " + ss.str(), logstream);
        edm::LogInfo("Generator|LHEInterface") << logstream.str();
}
  
ThePEGHadronisation::ThePEGHadronisation(const edm::ParameterSet &params) :
        ThePEGInterface(params),
        Hadronisation(params),
        handlerDirectory_(params.getParameter<string>("eventHandlers"))
{
        initRepository(params);
        proxy_ = LHEProxy::create();
        initLHE();
}

void ThePEGHadronisation::doInit()
{
}

ThePEGHadronisation::~ThePEGHadronisation()
{
}

std::auto_ptr<HepMC::GenEvent> ThePEGHadronisation::doHadronisation()
{
        edm::LogInfo("Generator|LHEInterface") << "Start production";

        proxy_->loadEvent(getRawEvent());

        ThePEG::EventPtr thepegEvent;
        try {
                flushRandomNumberGenerator();
                thepegEvent = eg_->shoot();
        } catch(ThePEG::Stop) {
                // no event
        }

        if (!thepegEvent) {
                edm::LogWarning("Generator|LHEInterface")
                        << "thepegEvent not initialized";
                return std::auto_ptr<HepMC::GenEvent>();
        }

        std::auto_ptr<HepMC::GenEvent> event = convert(thepegEvent);
        if (!event.get())
                return event;

        HepMC::PdfInfo pdf;
        clearAuxiliary(event.get(), &pdf);
        getRawEvent()->fillPdfInfo(&pdf);
        fillAuxiliary(event.get(), &pdf, thepegEvent);
        event->set_pdf_info(pdf);

        return event;
}

void ThePEGHadronisation::newRunInfo(
                                const boost::shared_ptr<LHERunInfo> &runInfo)
{
        proxy_->loadRunInfo(runInfo);
        initGenerator();
}

DEFINE_LHE_HADRONISATION_PLUGIN(ThePEGHadronisation);

} // namespace lhef