CosmicTrackSplitter.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/Framework/interface/ESHandle.h"

#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"

#include "DataFormats/Common/interface/View.h"
#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/TrackCandidate/interface/TrackCandidateCollection.h"
#include "DataFormats/TrackingRecHit/interface/InvalidTrackingRecHit.h"

#include "Geometry/Records/interface/TrackerDigiGeometryRecord.h"
#include "Geometry/TrackerGeometryBuilder/interface/TrackerGeometry.h"
#include "MagneticField/Engine/interface/MagneticField.h"
#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateTransform.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"

// added by me

#include "Geometry/CommonDetUnit/interface/TrackingGeometry.h"
#include "Geometry/CommonDetUnit/interface/GeomDet.h"
#include "DataFormats/GeometrySurface/interface/Surface.h"
#include "DataFormats/GeometrySurface/interface/GloballyPositioned.h"
#include "TrackingTools/TransientTrack/interface/TransientTrack.h"
#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"

#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
#include "DataFormats/GeometrySurface/interface/Surface.h"
#include "DataFormats/Math/interface/Vector.h"
#include "DataFormats/Math/interface/Error.h"
#include "TrackingTools/TrajectoryState/interface/CopyUsingClone.h"
#include "RecoVertex/VertexTools/interface/PerigeeLinearizedTrackState.h"

#include "TrackingTools/TransientTrack/interface/TransientTrack.h"

#include "DataFormats/GeometryCommonDetAlgo/interface/ErrorFrameTransformer.h"
#include "DataFormats/TrackingRecHit/interface/AlignmentPositionError.h"

#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"

#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"


#include "TrackingTools/PatternTools/interface/TrajTrackAssociation.h"
#include "TrackingTools/PatternTools/interface/Trajectory.h"
#include "TrackingTools/TrackFitters/interface/TrajectoryStateCombiner.h"


#include <boost/regex.hpp>

namespace reco { namespace modules {
       class CosmicTrackSplitter : public edm::stream::EDProducer<> {
    public:
        CosmicTrackSplitter(const edm::ParameterSet &iConfig) ;
        void produce(edm::Event &iEvent, const edm::EventSetup &iSetup) override;

    private:
        edm::EDGetTokenT<reco::TrackCollection> tokenTracks;
        edm::EDGetTokenT<TrajTrackAssociationCollection> tokenTrajTrack;
        int totalTracks_;
        size_t minimumHits_;

        bool replaceWithInactiveHits_;
        bool stripFrontInvalidHits_;
        bool stripBackInvalidHits_;
        bool stripAllInvalidHits_;
        bool excludePixelHits_;

        double dZcut_;
        double dXYcut_;

        std::vector<uint32_t> detsToIgnore_;

        edm::ESHandle<TrackerGeometry> theGeometry;
        edm::ESHandle<MagneticField>   theMagField;

        TrackCandidate makeCandidate(const reco::Track &tk, std::vector<TrackingRecHit *>::iterator hitsBegin, std::vector<TrackingRecHit *>::iterator hitsEnd) ;

    }; // class


    CosmicTrackSplitter::CosmicTrackSplitter(const edm::ParameterSet &iConfig) :
    minimumHits_(iConfig.getParameter<uint32_t>("minimumHits")),
    replaceWithInactiveHits_(iConfig.getParameter<bool>("replaceWithInactiveHits")),
    stripFrontInvalidHits_(iConfig.getParameter<bool>("stripFrontInvalidHits")),
    stripBackInvalidHits_( iConfig.getParameter<bool>("stripBackInvalidHits") ),
    stripAllInvalidHits_(  iConfig.getParameter<bool>("stripAllInvalidHits")  ),
    excludePixelHits_(  iConfig.getParameter<bool>("excludePixelHits")  ),
    dZcut_(iConfig.getParameter<double>("dzCut") ),
    dXYcut_(iConfig.getParameter<double>("dxyCut") ),
    detsToIgnore_( iConfig.getParameter<std::vector<uint32_t> >("detsToIgnore") )
    {
        // sanity check
        if (stripAllInvalidHits_ && replaceWithInactiveHits_) {
            throw cms::Exception("Configuration") << "Inconsistent Configuration: you can't set both 'stripAllInvalidHits' and 'replaceWithInactiveHits' to true\n";
        }
        tokenTracks= consumes<reco::TrackCollection>(iConfig.getParameter<edm::InputTag>("tracks"));
        tokenTrajTrack = consumes<TrajTrackAssociationCollection>(iConfig.getParameter<edm::InputTag>("tjTkAssociationMapTag") );

        LogDebug("CosmicTrackSplitter") << "sanity check";

        // sort detids to ignore
        std::sort(detsToIgnore_.begin(), detsToIgnore_.end());

        totalTracks_ = 0;

        // issue the produce<>
        produces<TrackCandidateCollection>();
    }

    void
    CosmicTrackSplitter::produce(edm::Event &iEvent, const edm::EventSetup &iSetup)
    {
        LogDebug("CosmicTrackSplitter") << "IN THE SPLITTER!!!!!";

        // read with View, so we can read also a TrackRefVector
        edm::Handle<std::vector<reco::Track> > tracks;
        iEvent.getByToken(tokenTracks, tracks);

        // also need trajectories ...
        // Retrieve trajectories and tracks from the event
        // -> merely skip if collection is empty
        edm::Handle<TrajTrackAssociationCollection> m_TrajTracksMap;
        iEvent.getByToken( tokenTrajTrack, m_TrajTracksMap );

        // read from EventSetup
        iSetup.get<TrackerDigiGeometryRecord>().get(theGeometry);
        iSetup.get<IdealMagneticFieldRecord>().get(theMagField);

        // prepare output collection
        auto output = std::make_unique<TrackCandidateCollection>();
        output->reserve(tracks->size());

        // working area and tools
        std::vector<TrackingRecHit *> hits;

        // Form pairs of trajectories and tracks
        //ConstTrajTrackPairCollection trajTracks;
        LogDebug("CosmicTrackSplitter") << "size of map: " << m_TrajTracksMap->size();
        int HITTOSPLITFROM = 0;
        for ( TrajTrackAssociationCollection::const_iterator iPair = m_TrajTracksMap->begin(); iPair != m_TrajTracksMap->end(); iPair++ ){
            const Trajectory* trajFromMap = &(*(*iPair).key);
            const reco::Track* trackFromMap = &(*(*iPair).val);

            // loop to find the hit to split from (by taking dot product of pT and transverse position
            std::vector<TrajectoryMeasurement> measurements = trajFromMap->measurements();
            int totalNumberOfHits = measurements.size();
            int numberOfHits = 0;
            double previousDotProduct = 0;
            for (trackingRecHit_iterator ith = trackFromMap->recHitsBegin(), edh = trackFromMap->recHitsEnd(); ith != edh; ++ith) {

                GlobalVector stateMomentum = measurements[numberOfHits].forwardPredictedState().globalMomentum();
                GlobalPoint statePosition = measurements[numberOfHits].forwardPredictedState().globalPosition();
                double dotProduct = stateMomentum.x()*statePosition.x() + stateMomentum.y()*statePosition.y();
                if ( dotProduct*previousDotProduct < 0 ){
                    //found hit to split from...
                    HITTOSPLITFROM = numberOfHits;
                }

                previousDotProduct = dotProduct;
                numberOfHits++;

            }
            LogDebug("CosmicTrackSplitter") << "number of rechits: " << numberOfHits;

            // check if the trajectories and rechits are in reverse order...
            trackingRecHit_iterator bIt = trackFromMap->recHitsBegin();
            trackingRecHit_iterator fIt = trackFromMap->recHitsEnd() - 1;
            const TrackingRecHit* bHit = (*bIt);
            const TrackingRecHit* fHit = (*fIt);
            // hit type valid = 0, missing = 1, inactive = 2, bad = 3
            if( bHit->type() != 0 || bHit->isValid() != 1){
                //loop over hits forwards until first Valid hit is found
                trackingRecHit_iterator ihit;
                for( ihit =  trackFromMap->recHitsBegin();
                    ihit != trackFromMap->recHitsEnd(); ++ihit){
                    const TrackingRecHit* iHit = (*ihit);
                    if( iHit->type() == 0 && iHit->isValid() == 1){
                        bHit = iHit;
                        break;
                    }
                }
            }
            DetId bdetid = bHit->geographicalId();
            GlobalPoint bPosHit = theGeometry->idToDetUnit( bdetid)->surface().
            toGlobal(bHit->localPosition());
            if( fHit->type() != 0 || fHit->isValid() != 1){
                //loop over hits backwards until first Valid hit is found
                trackingRecHit_iterator ihitf;
                for( ihitf =  trackFromMap->recHitsEnd()-1;
                    ihitf != trackFromMap->recHitsBegin(); --ihitf){
                    const TrackingRecHit* iHit = (*ihitf);
                    if( iHit->type() == 0 && iHit->isValid() == 1){
                        fHit = iHit;
                        break;
                    }
                }
            }
            DetId fdetid = fHit->geographicalId();
            GlobalPoint fPosHit =  theGeometry->
            idToDetUnit( fdetid )->surface().toGlobal(fHit->localPosition());
            GlobalPoint bPosState = measurements[0].updatedState().globalPosition();
            GlobalPoint fPosState = measurements[measurements.size()-1].
            updatedState().globalPosition();
            bool trajReversedFlag = false;
            /*
            DetId bdetid = bHit->geographicalId();
            DetId fdetid = fHit->geographicalId();
            GlobalPoint bPosHit =  theGeometry->idToDetUnit( bdetid )->surface().toGlobal(bHit->localPosition());
            GlobalPoint fPosHit =  theGeometry->idToDetUnit( fdetid )->surface().toGlobal(fHit->localPosition());
            GlobalPoint bPosState = measurements[0].updatedState().globalPosition();
            GlobalPoint fPosState = measurements[measurements.size() - 1].updatedState().globalPosition();
            bool trajReversedFlag = false;
            */
            if (( (bPosHit - bPosState).mag() > (bPosHit - fPosState).mag() ) && ( (fPosHit - fPosState).mag() > (fPosHit - bPosState).mag() ) ){
                trajReversedFlag = true;
            }
            if (trajReversedFlag){ int temp = HITTOSPLITFROM; HITTOSPLITFROM = totalNumberOfHits - temp; }
        }

        totalTracks_ = totalTracks_ + tracks->size();
        // loop on tracks
        for (std::vector<reco::Track>::const_iterator itt = tracks->begin(), edt = tracks->end(); itt != edt; ++itt) {
            hits.clear(); // extra safety

            LogDebug("CosmicTrackSplitter") << "ntracks: " << tracks->size();

            // try to find distance of closest approach
            GlobalPoint v( itt->vx(), itt->vy(), itt->vz() );

            //checks on impact parameter
            bool continueWithTrack = true;
            if (fabs(v.z()) > dZcut_) continueWithTrack = false;
            if (v.perp() > dXYcut_) continueWithTrack = false;
            if (continueWithTrack == false) return;

            // LOOP TWICE, ONCE FOR TOP AND ONCE FOR BOTTOM
            for (int i = 0; i < 2; ++i){
                hits.clear(); // extra safety
                LogDebug("CosmicTrackSplitter") << "   loop on hits of track #" << (itt - tracks->begin());
                int usedHitCtr = 0;
                int hitCtr = 0;
                for (trackingRecHit_iterator ith = itt->recHitsBegin(), edh = itt->recHitsEnd(); ith != edh; ++ith) {
                    //hitCtr++;
                    const TrackingRecHit * hit = (*ith); // ith is an iterator on edm::Ref to rechit
                    LogDebug("CosmicTrackSplitter") << "         hit number " << (ith - itt->recHitsBegin());
                    // let's look at valid hits
                    if (hit->isValid()) {
                        LogDebug("CosmicTrackSplitter") << "            valid, detid = " << hit->geographicalId().rawId();
                        DetId detid = hit->geographicalId();

                        if (detid.det() == DetId::Tracker) {  // check for tracker hits
                            LogDebug("CosmicTrackSplitter") << "            valid, tracker ";
                            bool  verdict = false;

                            //trying to get the global position of the hit
                            //const GeomDetUnit* geomDetUnit =  theGeometry->idToDetUnit( detid ).;

                            const GlobalPoint pos =  theGeometry->idToDetUnit( detid )->surface().toGlobal(hit->localPosition());
                            LogDebug("CosmicTrackSplitter") << "hit pos: " << pos << ", dca pos: " << v;

                            // top half
                            if ((i == 0)&&(hitCtr < HITTOSPLITFROM)){
                                verdict = true;
                                LogDebug("CosmicTrackSplitter") << "tophalf";
                            }
                            // bottom half
                            if ((i == 1)&&(hitCtr >= HITTOSPLITFROM)){
                                verdict = true;
                                LogDebug("CosmicTrackSplitter") << "bottomhalf";
                            }

                            // if the hit is good, check again at module level
                            if ( verdict  && std::binary_search(detsToIgnore_.begin(), detsToIgnore_.end(), detid.rawId())) {
                                verdict = false;
                            }

                            // if hit is good check to make sure that we are keeping pixel hits
                            if ( excludePixelHits_){
                                if ((detid.det() == DetId::Tracker)&&((detid.subdetId() == 1)||(detid.subdetId() == 2))) {  // check for pixel hits
                                    verdict = false;
                                }
                            }

                            LogDebug("CosmicTrackSplitter") << "                   verdict after module list: " << (verdict ? "ok" : "no");
                            if (verdict == true) {
                                // just copy the hit
                                hits.push_back(hit->clone());
                                usedHitCtr++;
                            }
                            else {
                                // still, if replaceWithInactiveHits is true we have to put a new hit
                                if (replaceWithInactiveHits_) {
                                    hits.push_back(new InvalidTrackingRecHit(*hit->det(), TrackingRecHit::inactive));
                                }
                            }
                        }
                        else { // just copy non tracker hits
                            hits.push_back(hit->clone());
                        }
                    }
                    else {
                        if (!stripAllInvalidHits_) {
                            hits.push_back(hit->clone());
                        }
                    } // is valid hit
                    LogDebug("CosmicTrackSplitter") << "         end of hit " << (ith - itt->recHitsBegin());
                    hitCtr++;
                } // loop on hits
                LogDebug("CosmicTrackSplitter") << "   end of loop on hits of track #" << (itt - tracks->begin());

                std::vector<TrackingRecHit *>::iterator begin = hits.begin(), end = hits.end();

                LogDebug("CosmicTrackSplitter") << "   selected " << hits.size() << " hits ";

                // strip invalid hits at the beginning
                if (stripFrontInvalidHits_) {
                    while ( (begin != end) && ( (*begin)->isValid() == false ) ) ++begin;
                }

                LogDebug("CosmicTrackSplitter") << "   after front stripping we have " << (end - begin) << " hits ";

                // strip invalid hits at the end
                if (stripBackInvalidHits_ && (begin != end)) {
                    --end;
                    while ( (begin != end) && ( (*end)->isValid() == false ) ) --end;
                    ++end;
                }

                LogDebug("CosmicTrackSplitter") << "   after back stripping we have " << (end - begin) << " hits ";

                // if we still have some hits
                //if ((end - begin) >= int(minimumHits_)) {
                if ( usedHitCtr >= int(minimumHits_)) {
                    output->push_back( makeCandidate ( *itt, begin, end ) );
                    LogDebug("CosmicTrackSplitter") << "we made a candidate of " << hits.size() << " hits!";
                }
                // now delete the hits not used by the candidate
                for (begin = hits.begin(), end = hits.end(); begin != end; ++begin) {
                    if (*begin) delete *begin;
                }
                LogDebug("CosmicTrackSplitter") << "loop: " << i << " has " << usedHitCtr << " active hits and " << hits.size() << " total hits...";
                hits.clear();
            } // loop twice for top and bottom
        } // loop on tracks
        LogDebug("CosmicTrackSplitter") << "totalTracks_ = " << totalTracks_;
        iEvent.put(std::move(output));
    }

    TrackCandidate
    CosmicTrackSplitter::makeCandidate(const reco::Track &tk, std::vector<TrackingRecHit *>::iterator hitsBegin, std::vector<TrackingRecHit *>::iterator hitsEnd) {

        LogDebug("CosmicTrackSplitter") << "Making a candidate!";


        PropagationDirection   pdir = tk.seedDirection();
        PTrajectoryStateOnDet state;
        if ( pdir == anyDirection ) throw cms::Exception("UnimplementedFeature") << "Cannot work with tracks that have 'anyDirecton' \n";
        //if ( (pdir == alongMomentum) == ( tk.p() >= tk.outerP() ) ) {
        if ( (pdir == alongMomentum) == (  (tk.outerPosition()-tk.innerPosition()).Dot(tk.momentum()) >= 0    ) ) {
            // use inner state
            TrajectoryStateOnSurface originalTsosIn(trajectoryStateTransform::innerStateOnSurface(tk, *theGeometry, &*theMagField));
            state = trajectoryStateTransform::persistentState( originalTsosIn, DetId(tk.innerDetId()) );
        } else {
            // use outer state
            TrajectoryStateOnSurface originalTsosOut(trajectoryStateTransform::outerStateOnSurface(tk, *theGeometry, &*theMagField));
            state = trajectoryStateTransform::persistentState( originalTsosOut, DetId(tk.outerDetId()) );
        }

        TrajectorySeed seed(state, TrackCandidate::RecHitContainer(), pdir);

        TrackCandidate::RecHitContainer ownHits;
        ownHits.reserve(hitsEnd - hitsBegin);
        for ( ; hitsBegin != hitsEnd; ++hitsBegin) { ownHits.push_back( *hitsBegin ); }

        TrackCandidate cand(ownHits, seed, state, tk.seedRef());


        LogDebug("CosmicTrackSplitter") << "   dumping the hits now: ";
        for (TrackCandidate::range hitR = cand.recHits(); hitR.first != hitR.second; ++hitR.first) {
              LogTrace("CosmicTrackSplitter") << "     hit detid = " << hitR.first->geographicalId().rawId() <<
            ", type  = " << typeid(*hitR.first).name();
        }

        return cand;
    }

}} //namespaces


// ========= MODULE DEF ==============
#include "FWCore/PluginManager/interface/ModuleDef.h"
#include "FWCore/Framework/interface/MakerMacros.h"

using reco::modules::CosmicTrackSplitter;
DEFINE_FWK_MODULE(CosmicTrackSplitter);