VertexDistance.h

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#ifndef VertexDistance_H
#define VertexDistance_H

#include "DataFormats/GeometryCommonDetAlgo/interface/Measurement1D.h"
#include "DataFormats/VertexReco/interface/Vertex.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h"
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryCommonDetAlgo/interface/GlobalError.h"

class VertexState;

class VertexDistance {
 public:

  virtual ~VertexDistance() {}

  Measurement1D distance(const reco::Vertex &, 
             const reco::Vertex &) const;

  Measurement1D distance(const VertexState &, 
             const VertexState &) const;

  Measurement1D distance(const reco::Vertex &, 
             const VertexState &) const;

  Measurement1D distance(const VertexState &, 
             const reco::Vertex &) const;

  virtual Measurement1D signedDistance(const reco::Vertex &primVtx , 
                       const reco::Vertex &secVtx,
                       const GlobalVector & momentum) const = 0;

  virtual float compatibility (const reco::Vertex &, 
                   const reco::Vertex &) const;

  virtual float compatibility (const VertexState &, 
                   const VertexState &) const;

  virtual float compatibility(const reco::Vertex &, 
             const VertexState &) const;

  virtual float compatibility(const VertexState &, 
             const reco::Vertex &) const;

  virtual VertexDistance * clone() const = 0;

protected: 
  virtual Measurement1D distance(const GlobalPoint & vtx1Position, 
                 const GlobalError & vtx1PositionError, 
                 const GlobalPoint & vtx2Position, 
                 const GlobalError & vtx2PositionError) const = 0;

  virtual float compatibility(const GlobalPoint & vtx1Position, 
                  const GlobalError & vtx1PositionError, 
                  const GlobalPoint & vtx2Position, 
                  const GlobalError & vtx2PositionError) const = 0;

};
#endif  //  Tracker_VertexDistance_H