FakeTrackProducers.cc

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//
//

#include "FWCore/Framework/interface/stream/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"

#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/TrackReco/interface/TrackExtra.h"
#include "DataFormats/TrackCandidate/interface/TrackCandidate.h"
#include "DataFormats/TrackingRecHit/interface/TrackingRecHit.h"
#include "DataFormats/TrackerCommon/interface/TrackerTopology.h"
#include "TrackingTools/TrackRefitter/interface/TrackTransformer.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateTransform.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
#include "CommonTools/Utils/interface/StringCutObjectSelector.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateTransform.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
#include "MagneticField/Engine/interface/MagneticField.h"
#include "Geometry/TrackerGeometryBuilder/interface/TrackerGeometry.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "Geometry/Records/interface/TrackerDigiGeometryRecord.h"
#include "Geometry/Records/interface/TrackerTopologyRcd.h"
#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"



template<class T>
class FakeTrackProducer : public edm::stream::EDProducer<> {
    public:
      explicit FakeTrackProducer(const edm::ParameterSet & iConfig);
      ~FakeTrackProducer() override { }

      void produce(edm::Event & iEvent, const edm::EventSetup & iSetup) override;
    private:
      edm::EDGetTokenT<std::vector<T>> src_;

      //StringCutObjectSelector<T> selector_;

      const PTrajectoryStateOnDet & getState(const TrajectorySeed &seed) const { return seed.startingState(); }
      const PTrajectoryStateOnDet & getState(const TrackCandidate &seed) const { return seed.trajectoryStateOnDet(); }
      TrajectorySeed::range  getHits (const TrajectorySeed &seed) const { return seed.recHits(); }
      TrajectorySeed::range  getHits (const TrackCandidate &seed) const { return seed.recHits(); }
};


template<typename T>
FakeTrackProducer<T>::FakeTrackProducer(const edm::ParameterSet & iConfig) :
    src_(consumes<std::vector<T>>(iConfig.getParameter<edm::InputTag>("src")))
    //,selector_(iConfig.existsAs<std::string>("cut") ? iConfig.getParameter<std::string>("cut") : "", true)
{
    produces<std::vector<reco::Track> >(); 
    produces<std::vector<reco::TrackExtra> >();
    produces<edm::OwnVector<TrackingRecHit> >();
}

template<typename T>
void 
FakeTrackProducer<T>::produce(edm::Event & iEvent, const edm::EventSetup & iSetup) {
    using namespace edm;
    using namespace std;


    edm::ESHandle<TrackerGeometry> theGeometry;
    iSetup.get<TrackerDigiGeometryRecord>().get(theGeometry);
    edm::ESHandle<MagneticField>   theMagField;
    iSetup.get<IdealMagneticFieldRecord>().get(theMagField);
    edm::ESHandle<TrackerTopology> httopo;
    iSetup.get<TrackerTopologyRcd>().get(httopo);
    const TrackerTopology& ttopo = *httopo;

    Handle<vector<T> > src;
    iEvent.getByToken(src_, src);

    unique_ptr<vector<reco::Track> > out(new vector<reco::Track>());
    out->reserve(src->size());
    unique_ptr<vector<reco::TrackExtra> > outEx(new vector<reco::TrackExtra>());
    outEx->reserve(src->size());
    unique_ptr<OwnVector<TrackingRecHit> > outHits(new OwnVector<TrackingRecHit>());

    TrackingRecHitRefProd rHits = iEvent.getRefBeforePut<TrackingRecHitCollection>();
    reco::TrackExtraRefProd rTrackExtras = iEvent.getRefBeforePut<reco::TrackExtraCollection>();
    for (typename vector<T>::const_iterator it = src->begin(), ed = src->end(); it != ed; ++it) {
        const T &mu = *it;
        //if (!selector_(mu)) continue;
        const PTrajectoryStateOnDet & pstate = getState(mu);
        const GeomDet *det = theGeometry->idToDet(DetId(pstate.detId()));
        if (det == nullptr) { std::cerr << "ERROR:  bogus detid " << pstate.detId() << std::endl; continue; }
        TrajectoryStateOnSurface state = trajectoryStateTransform::transientState(pstate, & det->surface(), &*theMagField);
        GlobalPoint  gx = state.globalPosition();
        GlobalVector gp = state.globalMomentum();
        reco::Track::Point x(gx.x(), gx.y(), gx.z());
        reco::Track::Vector p(gp.x(), gp.y(), gp.z());
        int charge = state.localParameters().charge();
        out->push_back(reco::Track(1.0,1.0,x,p,charge,reco::Track::CovarianceMatrix()));
        TrajectorySeed::range hits = getHits(mu);
        out->back().appendHits(hits.first, hits.second, ttopo);
        // Now Track Extra
        const TrackingRecHit *hit0 =  &*hits.first;
        const TrackingRecHit *hit1 = &*(hits.second-1);
        const GeomDet *det0 = theGeometry->idToDet(hit0->geographicalId());
        const GeomDet *det1 = theGeometry->idToDet(hit1->geographicalId());
        if (det0 == nullptr || det1 == nullptr) { std::cerr << "ERROR:  bogus detids at beginning or end of range" << std::endl; continue; }
        GlobalPoint gx0 = det0->toGlobal(hit0->localPosition());
        GlobalPoint gx1 = det1->toGlobal(hit1->localPosition());
        reco::Track::Point x0(gx0.x(), gx0.y(), gx0.z());
        reco::Track::Point x1(gx1.x(), gx1.y(), gx1.z());
        if (x0.R() > x1.R()) std::swap(x0,x1);
        outEx->push_back( reco::TrackExtra(x1, p, true, x0, p, true, 
                                reco::Track::CovarianceMatrix(), hit0->geographicalId().rawId(),
                                reco::Track::CovarianceMatrix(), hit1->geographicalId().rawId(),
                                alongMomentum) );
        out->back().setExtra( reco::TrackExtraRef( rTrackExtras, outEx->size()-1 ) );
        reco::TrackExtra &ex = outEx->back();    
        auto const firstHitIndex = outHits->size();
        for (OwnVector<TrackingRecHit>::const_iterator it2 = hits.first; it2 != hits.second; ++it2) {
            outHits->push_back(*it2);
        } 
        ex.setHits( rHits, firstHitIndex, outHits->size()-firstHitIndex);
    }

    iEvent.put(std::move(out));
    iEvent.put(std::move(outEx));
    iEvent.put(std::move(outHits));
}

typedef  FakeTrackProducer<TrajectorySeed> FakeTrackProducerFromSeed;
typedef  FakeTrackProducer<TrackCandidate> FakeTrackProducerFromCandidate;
#include "FWCore/Framework/interface/MakerMacros.h"
DEFINE_FWK_MODULE(FakeTrackProducerFromSeed);
DEFINE_FWK_MODULE(FakeTrackProducerFromCandidate);