IVertexUpdator.h

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/*
  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
*/
 
// IVertexUpdator, (c) ATLAS Detector software 2006
 
#ifndef TRKVERTEXFITTERINTERFACE_IVERTEXUPDATOR_H
#define TRKVERTEXFITTERINTERFACE_IVERTEXUPDATOR_H
 
#include "GaudiKernel/IAlgTool.h"
#include "xAODTracking/Vertex.h"
 
namespace Trk
{
 
  static const InterfaceID IID_IVertexUpdator("IVertexUpdator", 1, 0);
 
  class VxTrackAtVertex;
  class LinearizedTrack;
 
  class IVertexUpdator : virtual public IAlgTool {
 
     public:
       virtual ~IVertexUpdator(){};
 
       static const InterfaceID& interfaceID() { return IID_IVertexUpdator; };
     
       // Slim struct used to transport the (temporary) result of positionUpdate. 
       // Significantly faster than using an xAOD::Vertex for this purpose. 
       struct positionUpdateOutcome{
          Amg::Vector3D position;       // vertex position
          AmgSymMatrix(3) covariancePosition;   // position covariance
          AmgSymMatrix(5) trkParametersWeight;  // inverse track parameter covariance, 
                                                // cached to avoid re-calculation
       }; 
 
       // operating mode for positionUpdate. 
       typedef enum{
          removeTrack=-1, 
          addTrack=1 
       } updateMode;
 
       virtual xAOD::Vertex * add(xAOD::Vertex &,  VxTrackAtVertex &) const =0;
 
       virtual xAOD::Vertex * remove(xAOD::Vertex &,  VxTrackAtVertex &) const = 0;
 
       virtual positionUpdateOutcome positionUpdate (const xAOD::Vertex& vtx, const LinearizedTrack * trk, double trackWeight, updateMode mode) const = 0;
       
       virtual float trackParametersChi2(const xAOD::Vertex& new_vtx, const LinearizedTrack * trk) const = 0;
       virtual float trackParametersChi2(const positionUpdateOutcome & new_vtx , const LinearizedTrack * trk) const = 0;
 
       virtual float vertexPositionChi2(const xAOD::Vertex& old_vtx, const xAOD::Vertex& new_vtx) const = 0;
       virtual float vertexPositionChi2(const xAOD::Vertex& old_vtx, const positionUpdateOutcome & new_vtx) const = 0;
 
  };
}
#endif