BasicGhostTrackState.h

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#ifndef RecoBTag_BasicGhostTrackState_h
#define RecoBTag_BasicGhostTrackState_h

#include <utility>

#include "DataFormats/GeometrySurface/interface/ReferenceCounted.h"
#include "TrackingTools/TrajectoryState/interface/ProxyBase.h"
#include "TrackingTools/TrajectoryState/interface/CopyUsingClone.h"

#include "DataFormats/Math/interface/Error.h"
#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"

namespace reco {

class GhostTrackPrediction;

class BasicGhostTrackState : public ReferenceCountedInEvent {
    public:
    typedef BasicGhostTrackState            BGTS;
    typedef ProxyBase<BGTS, CopyUsingClone<BGTS> >  Proxy;

    private:
    friend class ProxyBase<BGTS, CopyUsingClone<BGTS> >;
    friend class ReferenceCountingPointer<BGTS>;
    friend class CopyUsingClone<BGTS>;

    public:
    typedef math::Error<3>::type CovarianceMatrix;
    typedef std::pair<GlobalPoint, GlobalError> Vertex;

    BasicGhostTrackState() : lambda_(0.), weight_(1.) {}
    ~BasicGhostTrackState() override {}

    virtual GlobalPoint globalPosition() const = 0;
    virtual GlobalError cartesianError() const = 0;
    virtual CovarianceMatrix cartesianCovariance() const = 0;

    double lambda() const { return lambda_; }
    virtual bool isValid() const { return true; }

    virtual void reset() {}
    virtual bool linearize(const GhostTrackPrediction &pred,
                           bool initial, double lambda)
    { lambda_ = lambda; return true; }
    virtual bool linearize(const GhostTrackPrediction &pred,
                           double lambda)
    { lambda_ = lambda; return true; }

    virtual Vertex vertexStateOnGhostTrack(
                const GhostTrackPrediction &pred,
                bool withMeasurementError) const = 0;
    virtual Vertex vertexStateOnMeasurement(
                const GhostTrackPrediction &pred,
                bool withGhostTrackError) const = 0;

    double weight() const { return weight_; }
    void setWeight(double weight) { weight_ = weight; }

    protected:
    virtual BasicGhostTrackState *clone() const = 0;

    double  lambda_;
    double  weight_;
};

}

#endif // RecoBTag_BasicGhostTrackState_h