SeedFromGenericPairOrTriplet.h

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#ifndef SpecialSeedGenerators_SeedFromGenericPairOrTriplet_h
#define SpecialSeedGenerators_SeedFromGenericPairOrTriplet_h
/*
Class that produces a TrajectorySeed from a generic hit pair or triplet withou the vertex constraint.
If used without B (e.g. cosmics) it checks the three hits are aligned.
If used with B it checks the initial state has a momentum greated than the threshold set in the cfg
*/
//FWK
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
//DataFormats
#include "DataFormats/TrajectorySeed/interface/TrajectorySeed.h"
#include "DataFormats/TrajectorySeed/interface/PropagationDirection.h"
#include "DataFormats/TrackingRecHit/interface/TrackingRecHit.h"
//RecoLocal
#include "RecoTracker/TkSeedingLayers/interface/SeedingHitSet.h"
//TrackingTools
#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
#include "TrackingTools/GeomPropagators/interface/Propagator.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateTransform.h"
#include "TrackingTools/TransientTrackingRecHit/interface/TransientTrackingRecHitBuilder.h"
#include "TrackingTools/DetLayers/interface/NavigationDirection.h"
//Geometry
#include "Geometry/TrackerGeometryBuilder/interface/TrackerGeometry.h"
//MagneticField
#include "MagneticField/Engine/interface/MagneticField.h"

#include <vector>

class SeedFromGenericPairOrTriplet{
    public:
    SeedFromGenericPairOrTriplet(const MagneticField* mf,
                     const TrackerGeometry* geom,
                     const TransientTrackingRecHitBuilder* builder,
                     const Propagator* propagatorAlong,
                     const Propagator* propagatorOpposite,
                     const std::vector<int>& charges,       
                     bool momFromPSet,
                     double errorRescaling );
    ~SeedFromGenericPairOrTriplet(){};
    void setMomentumTo(double mom){theP = mom;};
    bool momentumFromPSet(){return theSetMomentum;}; 
    //builds a seed from a pair or triplet. it returns a null pointer if the seed does not pass the quality filter
    std::vector<TrajectorySeed*> seed(const SeedingHitSet& hits,
                                         const PropagationDirection& dir,
                                         const NavigationDirection&  seedDir,
                                         const edm::EventSetup& iSetup);
    TrajectorySeed* seedFromTriplet(const SeedingHitSet& hits,
                                        const PropagationDirection& dir,
                    const NavigationDirection&  seedDir,
                                    const edm::EventSetup& iSetup, int charge = -1) const ;
    TrajectorySeed*    seedFromPair(const SeedingHitSet& hits,
                                    const PropagationDirection& dir,
                    const NavigationDirection&  seedDir, int charge = -1) const ;

    
    private:
    TrajectorySeed*       buildSeed(const GlobalVector& momentum,
                    int charge,
                                    //const TrackingRecHit* firsthit,
                    std::vector<const TrackingRecHit*>& trHits,
                                    const PropagationDirection& dir) const;
    //initial error estimate    
    //CurvilinearTrajectoryError initialError(const TrackingRecHit* rechit);    
    //in the case of noB it returns false if 3 hist are not aligned
    //if the B is on it returns false if the initial momentum is less than p
    bool qualityFilter(const SeedingHitSet& hits) const ;
    bool qualityFilter(const GlobalVector& momentum) const;
    const MagneticField*   theMagfield;
    const TrackerGeometry* theTracker;
    const TransientTrackingRecHitBuilder* theBuilder;
    const Propagator* thePropagatorAlong;
    const Propagator* thePropagatorOpposite;
        
    float theP;
    bool theSetMomentum;
    std::vector<int> theCharges;
    double theErrorRescaling;   
};

#endif