/data/refman/pasoursint/CMSSW_6_1_2_SLHC2/src/Alignment/MuonAlignmentAlgorithms/plugins/CSCOverlapsTrackPreparation.cc

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// -*- C++ -*-
//
// Package:    CSCOverlapsTrackPreparation
// Class:      CSCOverlapsTrackPreparation
// 
//
// Original Author:  Jim Pivarski
//         Created:  Wed Dec 12 13:31:55 CST 2007
// $Id: CSCOverlapsTrackPreparation.cc,v 1.9 2011/12/22 20:01:12 innocent Exp $
//
//

// system include files
#include <memory>

// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"

// references
#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "Geometry/CSCGeometry/interface/CSCGeometry.h"
#include "DataFormats/MuonDetId/interface/MuonSubdetId.h"
#include "DataFormats/MuonDetId/interface/CSCDetId.h"
#include "Geometry/Records/interface/MuonGeometryRecord.h"
#include "MagneticField/Engine/interface/MagneticField.h"
#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"
#include "DataFormats/TrackingRecHit/interface/TrackingRecHitFwd.h"
#include "DataFormats/TrackingRecHit/interface/TrackingRecHit.h"
#include "RecoMuon/TransientTrackingRecHit/interface/MuonTransientTrackingRecHitBuilder.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateTransform.h"
#include "Geometry/CommonDetUnit/interface/GlobalTrackingGeometry.h"
#include "Geometry/Records/interface/GlobalTrackingGeometryRecord.h"
#include "CondFormats/Alignment/interface/Definitions.h"
#include "DataFormats/GeometrySurface/interface/Surface.h"

#include "FWCore/ServiceRegistry/interface/Service.h"
#include "CommonTools/UtilAlgos/interface/TFileService.h"
#include "TTree.h"

// products
#include "TrackingTools/PatternTools/interface/Trajectory.h"
#include "TrackingTools/PatternTools/interface/TrajTrackAssociation.h"

//
// class decleration
//

class CSCOverlapsTrackPreparation : public edm::EDProducer {
   public:
      explicit CSCOverlapsTrackPreparation(const edm::ParameterSet&);
      ~CSCOverlapsTrackPreparation();

   private:
      enum {kNothing, kSimpleFit, kAllButOne, kExtrapolate};

      virtual void beginJob();
      virtual void produce(edm::Event&, const edm::EventSetup&);
      virtual void endJob();
      
      // ----------member data ---------------------------
      edm::InputTag m_src;
};

//
// constants, enums and typedefs
//

//
// static data member definitions
//

//
// constructors and destructor
//
CSCOverlapsTrackPreparation::CSCOverlapsTrackPreparation(const edm::ParameterSet& iConfig)
   : m_src(iConfig.getParameter<edm::InputTag>("src"))
{
   produces<std::vector<Trajectory> >();
   produces<TrajTrackAssociationCollection>();
}


CSCOverlapsTrackPreparation::~CSCOverlapsTrackPreparation()
{
   // do anything here that needs to be done at desctruction time
   // (e.g. close files, deallocate resources etc.)
}


//
// member functions
//

// ------------ method called to produce the data  ------------
void
CSCOverlapsTrackPreparation::produce(edm::Event& iEvent, const edm::EventSetup& iSetup) {
  edm::Handle<reco::TrackCollection> tracks;
  iEvent.getByLabel(m_src, tracks);

  edm::ESHandle<CSCGeometry> cscGeometry;
  iSetup.get<MuonGeometryRecord>().get(cscGeometry);

  edm::ESHandle<MagneticField> magneticField;
  iSetup.get<IdealMagneticFieldRecord>().get(magneticField);

  edm::ESHandle<GlobalTrackingGeometry> globalGeometry;
  iSetup.get<GlobalTrackingGeometryRecord>().get(globalGeometry);

  
  MuonTransientTrackingRecHitBuilder muonTransBuilder;

  // Create a collection of Trajectories, to put in the Event
  std::auto_ptr<std::vector<Trajectory> > trajectoryCollection(new std::vector<Trajectory>);

  // Remember which trajectory is associated with which track
  std::map<edm::Ref<std::vector<Trajectory> >::key_type, edm::Ref<reco::TrackCollection>::key_type> reference_map;
  edm::Ref<std::vector<Trajectory> >::key_type trajCounter = 0;
  edm::Ref<reco::TrackCollection>::key_type trackCounter = 0;

  for (reco::TrackCollection::const_iterator track = tracks->begin();  track != tracks->end();  ++track) {
    trackCounter++;

    // now we'll actually put hits on the new trajectory
    // these must be in lock-step
    edm::OwnVector<TrackingRecHit> clonedHits;
    std::vector<TrajectoryMeasurement::ConstRecHitPointer> transHits;
    std::vector<TrajectoryStateOnSurface> TSOSes;

    for (trackingRecHit_iterator hit = track->recHitsBegin();  hit != track->recHitsEnd();  ++hit) {
      DetId id = (*hit)->geographicalId();
      if (id.det() == DetId::Muon  &&  id.subdetId() == MuonSubdetId::CSC) {
        const Surface &layerSurface = cscGeometry->idToDet(id)->surface();
        TrajectoryMeasurement::ConstRecHitPointer hitPtr(muonTransBuilder.build(&**hit, globalGeometry));

        AlgebraicVector5 params;   // meaningless, CSCOverlapsAlignmentAlgorithm does the fit internally
        params[0] = 1.;  // straight-forward direction
        params[1] = 0.;
        params[2] = 0.;
        params[3] = 0.;  // center of the chamber
        params[4] = 0.;
        LocalTrajectoryParameters localTrajectoryParameters(params, 1., false);
        LocalTrajectoryError localTrajectoryError(0.001, 0.001, 0.001, 0.001, 0.001);

        // these must be in lock-step
        clonedHits.push_back((*hit)->clone());
        transHits.push_back(hitPtr);
        TSOSes.push_back(TrajectoryStateOnSurface(localTrajectoryParameters, localTrajectoryError, layerSurface, &*magneticField));
      } // end if CSC
    } // end loop over hits

    assert(clonedHits.size() == transHits.size());
    assert(transHits.size() == TSOSes.size());

    // build the trajectory
    if (clonedHits.size() > 0) {
      PTrajectoryStateOnDet const PTraj = trajectoryStateTransform::persistentState(*(TSOSes.begin()), clonedHits.begin()->geographicalId().rawId());
      TrajectorySeed trajectorySeed(PTraj, clonedHits, alongMomentum);
      Trajectory trajectory(trajectorySeed, alongMomentum);

      edm::OwnVector<TrackingRecHit>::const_iterator clonedHit = clonedHits.begin();
      std::vector<TrajectoryMeasurement::ConstRecHitPointer>::const_iterator transHitPtr = transHits.begin();
      std::vector<TrajectoryStateOnSurface>::const_iterator TSOS = TSOSes.begin();
      for (;  clonedHit != clonedHits.end();  ++clonedHit, ++transHitPtr, ++TSOS) {
        trajectory.push(TrajectoryMeasurement(*TSOS, *TSOS, *TSOS, (*transHitPtr)));
      }

      trajectoryCollection->push_back(trajectory);

      // Remember which Trajectory is associated with which Track
      trajCounter++;
      reference_map[trajCounter] = trackCounter;

    } // end if there are any clonedHits/TSOSes to work with
  } // end loop over tracks

  unsigned int numTrajectories = trajectoryCollection->size();

  // insert the trajectories into the Event
  edm::OrphanHandle<std::vector<Trajectory> > ohTrajs = iEvent.put(trajectoryCollection);

  // create the trajectory <-> track association map
  std::auto_ptr<TrajTrackAssociationCollection> trajTrackMap(new TrajTrackAssociationCollection());

  for (trajCounter = 0;  trajCounter < numTrajectories;  trajCounter++) {
    edm::Ref<reco::TrackCollection>::key_type trackCounter = reference_map[trajCounter];

    trajTrackMap->insert(edm::Ref<std::vector<Trajectory> >(ohTrajs, trajCounter), edm::Ref<reco::TrackCollection>(tracks, trackCounter));
  }
  // and put it in the Event, also
  iEvent.put(trajTrackMap);
}

// ------------ method called once each job just before starting event loop  ------------
void CSCOverlapsTrackPreparation::beginJob() {}

// ------------ method called once each job just after ending the event loop  ------------
void CSCOverlapsTrackPreparation::endJob() {}

//define this as a plug-in
DEFINE_FWK_MODULE(CSCOverlapsTrackPreparation);