/data/refman/pasoursint/CMSSW_4_1_8_patch9/src/CommonTools/RecoAlgos/interface/CosmicTrackingParticleSelector.h

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#ifndef RecoSelectors_CosmicTrackingParticleSelector_h
#define RecoSelectors_CosmicTrackingParticleSelector_h
/* \class CosmicTrackingParticleSelector
 *
 * \author Yanyan Gao, FNAL
 *
 *  $Date: 2010/02/11 00:10:48 $
 *  $Revision: 1.2 $
 *
 */
#include "SimDataFormats/TrackingAnalysis/interface/TrackingParticle.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "DataFormats/BeamSpot/interface/BeamSpot.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
#include "TrackingTools/PatternTools/interface/TSCBLBuilderNoMaterial.h"
#include "TrackingTools/PatternTools/interface/TSCPBuilderNoMaterial.h"
#include "MagneticField/Engine/interface/MagneticField.h" 
#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"

#include "Geometry/Records/interface/TrackerDigiGeometryRecord.h"
#include <Geometry/TrackerGeometryBuilder/interface/TrackerGeometry.h>
#include <DataFormats/GeometrySurface/interface/Surface.h>
#include <DataFormats/GeometrySurface/interface/GloballyPositioned.h>
#include <Geometry/CommonDetUnit/interface/GeomDet.h>
#include "DataFormats/GeometryVector/interface/GlobalVector.h"
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"

class TrajectoryStateClosestToBeamLineBuilder;

class CosmicTrackingParticleSelector {

public:
  typedef TrackingParticleCollection collection;
  typedef std::vector<const TrackingParticle *> container;
  typedef container::const_iterator const_iterator;
  
  CosmicTrackingParticleSelector(){}

  CosmicTrackingParticleSelector ( double ptMin,double minRapidity,double maxRapidity,
                                   double tip,double lip,int minHit, bool chargedOnly, 
                                   std::vector<int> pdgId = std::vector<int>()) :
    ptMin_( ptMin ), minRapidity_( minRapidity ), maxRapidity_( maxRapidity ),
    tip_( tip ), lip_( lip ), minHit_( minHit ), chargedOnly_(chargedOnly), pdgId_( pdgId ) { }


    CosmicTrackingParticleSelector  ( const edm::ParameterSet & cfg ) :
      ptMin_(cfg.getParameter<double>("ptMin")),
      minRapidity_(cfg.getParameter<double>("minRapidity")),
      maxRapidity_(cfg.getParameter<double>("maxRapidity")),
      tip_(cfg.getParameter<double>("tip")),
      lip_(cfg.getParameter<double>("lip")),
      minHit_(cfg.getParameter<int>("minHit")),
      chargedOnly_(cfg.getParameter<bool>("chargedOnly")),
      pdgId_(cfg.getParameter<std::vector<int> >("pdgId")) { }
      
      
      void select( const edm::Handle<collection>& c, const edm::Event & event, const edm::EventSetup& setup) {
        selected_.clear();
        edm::Handle<reco::BeamSpot> beamSpot;
        event.getByLabel(edm::InputTag("offlineBeamSpot"), beamSpot); 
        for( TrackingParticleCollection::const_iterator itp = c->begin(); 
             itp != c->end(); ++ itp )
          if ( operator()(*itp,beamSpot.product(),event,setup) ) {
            selected_.push_back( & * itp );
          }
      }
      
    const_iterator begin() const { return selected_.begin(); }
    const_iterator end() const { return selected_.end(); }
    
    // Operator() performs the selection: e.g. if (tPSelector(tp, bs, event, evtsetup)) {...
    bool operator()( const TrackingParticle & tp, const reco::BeamSpot* bs, const edm::Event &iEvent, const edm::EventSetup& iSetup ) const { 
      if (chargedOnly_ && tp.charge()==0) return false;//select only if charge!=0
      bool testId = false;
      unsigned int idSize = pdgId_.size();
      if (idSize==0) testId = true;
      else for (unsigned int it=0;it!=idSize;++it){
        if (tp.pdgId()==pdgId_[it]) testId = true;
      }
      
      edm::ESHandle<TrackerGeometry> tracker;
      iSetup.get<TrackerDigiGeometryRecord>().get(tracker);
      
      edm::ESHandle<MagneticField> theMF;
      iSetup.get<IdealMagneticFieldRecord>().get(theMF);
      
      GlobalVector finalGV (0,0,0);
      GlobalPoint finalGP(0,0,0);      
      GlobalVector momentum(0,0,0);//At the PCA
      GlobalPoint vertex(0,0,0);//At the PCA
      double radius(9999);
      bool found(0);
      
      const std::vector<PSimHit> & simHits = tp.trackPSimHit(DetId::Tracker);
      for(std::vector<PSimHit>::const_iterator it=simHits.begin(); it!=simHits.end(); ++it){
        const GeomDet* tmpDet  = tracker->idToDet( DetId(it->detUnitId()) ) ;
        LocalVector  lv = it->momentumAtEntry();
        Local3DPoint lp = it->localPosition ();
        GlobalVector gv = tmpDet->surface().toGlobal( lv );
        GlobalPoint  gp = tmpDet->surface().toGlobal( lp );
        if(gp.perp()<radius){
          found=true;
          radius = gp.perp();
          finalGV = gv;
          finalGP = gp;
        }
      }
      if(!found) return 0;
      else
        {
          FreeTrajectoryState ftsAtProduction(finalGP,finalGV,TrackCharge(tp.charge()),theMF.product());
          TSCBLBuilderNoMaterial tscblBuilder;
          TrajectoryStateClosestToBeamLine tsAtClosestApproach = tscblBuilder(ftsAtProduction,*bs);//as in TrackProducerAlgorithm
          if(!tsAtClosestApproach.isValid()){
            std::cout << "WARNING: tsAtClosestApproach is not valid" << std::endl;
            return 0;
          }
          else
            {
              momentum = tsAtClosestApproach.trackStateAtPCA().momentum();
              vertex = tsAtClosestApproach.trackStateAtPCA().position();
              return (
                      tp.matchedHit() >= minHit_ &&
                      sqrt(momentum.perp2()) >= ptMin_ && 
                      momentum.eta() >= minRapidity_ && momentum.eta() <= maxRapidity_ && 
                      sqrt(vertex.perp2()) <= tip_ &&
                      fabs(vertex.z()) <= lip_ 
                      );
            }
        }
    }
    
    size_t size() const { return selected_.size(); }
    
 private:
    
    double ptMin_;
    double minRapidity_;
    double maxRapidity_;
    double tip_;
    double lip_;
    int    minHit_;
    bool chargedOnly_;
      std::vector<int> pdgId_;
      container selected_;
      
      
};

#endif