TrackMerger.h

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#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/TrackCandidate/interface/TrackCandidate.h"
#include "TrackingTools/TransientTrackingRecHit/interface/TransientTrackingRecHitBuilder.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 "MagneticField/Records/interface/IdealMagneticFieldRecord.h"
#include "DataFormats/TrackerCommon/interface/TrackerTopology.h"

class TrackMerger {
    public:
        TrackMerger(const edm::ParameterSet &iConfig) ;
        ~TrackMerger();

        void init(const edm::EventSetup &iSetup) ;

        TrackCandidate merge(const reco::Track &inner, const reco::Track &outer) const;
    private:
        edm::ESHandle<TrackerGeometry> theGeometry;
        edm::ESHandle<MagneticField>   theMagField;
        bool useInnermostState_;
        bool debug_;
        std::string theBuilderName;
        edm::ESHandle<TransientTrackingRecHitBuilder> theBuilder;
    edm::ESHandle<TrackerTopology> theTrkTopo;

        class GlobalMomentumSort {
            public: 
                GlobalMomentumSort(const GlobalVector &dir) : dir_(dir) {}
                bool operator()(const TransientTrackingRecHit::RecHitPointer &hit1, const TransientTrackingRecHit::RecHitPointer &hit2) const ;
            private:
                GlobalVector dir_;
        };
        class MomentumSort {
            public: 
                MomentumSort(const GlobalVector &dir, const TrackerGeometry *geometry) : dir_(dir), geom_(geometry) {}
                bool operator()(const TrackingRecHit *hit1, const TrackingRecHit *hit2) const ;
            private:
                GlobalVector dir_;
                const TrackerGeometry *geom_;
        };
};