/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/RecoVertex/GhostTrackFitter/interface/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.) {}
        virtual ~BasicGhostTrackState() {}

        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