TrackGhostTrackState.h

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#ifndef RecoBTag_TrackGhostTrackState_h
#define RecoBTag_TrackGhostTrackState_h

#include <utility>

#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h"
#include "DataFormats/GeometryCommonDetAlgo/interface/GlobalError.h"

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

#include "RecoVertex/GhostTrackFitter/interface/BasicGhostTrackState.h"

namespace reco {

class GhostTrackPrediction;

class TrackGhostTrackState : public BasicGhostTrackState {
    public:
    TrackGhostTrackState(const TransientTrack &track) : track_(track) {}

    const TransientTrack &track() const { return track_; }
    const TrajectoryStateOnSurface &tsos() const { return tsos_; }

    bool isValid() const { return tsos_.isValid(); }

    GlobalPoint globalPosition() const
    { return tsos_.globalPosition(); }
    GlobalError cartesianError() const
    { return tsos_.cartesianError().position(); }
    CovarianceMatrix cartesianCovariance() const
    { return tsos_.cartesianError().matrix().Sub<CovarianceMatrix>(0, 0); }

    void reset() { tsos_ = TrajectoryStateOnSurface(); }
    bool linearize(const GhostTrackPrediction &pred,
                   bool initial, double lambda);
    bool linearize(const GhostTrackPrediction &pred, double lambda);

    Vertex vertexStateOnGhostTrack(const GhostTrackPrediction &pred,
                                   bool withMeasurementError) const;
    Vertex vertexStateOnMeasurement(const GhostTrackPrediction &pred,
                                    bool withGhostTrackError) const;

    private:
    BasicGhostTrackState *clone() const
    { return new TrackGhostTrackState(*this); }

    TrajectoryStateOnSurface    tsos_;
    TransientTrack          track_;
};

}

#endif // RecoBTag_TrackGhostTrackState_h