RecVertexPositions.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
/***************************************************************************
                           RecVertexPositions.h  -  Description
                             -------------------
    begin   : Autumn 2006
    authors : Giacinto Piacquadio (Freiburg University)
    email   : Giacinto.Piacquadio@cern.ch
    changes : 
 
 
 ***************************************************************************/
 
#ifndef VxJetVertex_RecVertexPositions_H
#define VxJetVertex_RecVertexPositions_H
 
#include "VxJetVertex/VertexPositions.h" 
#include "TrkEventPrimitives/FitQuality.h"
 
#include <iosfwd>
 
class MsgStream;
 
 
namespace Trk {
 
  class RecVertexPositions : public VertexPositions {
  public:
    RecVertexPositions(); 
    RecVertexPositions(const VertexPositions & pos); 
    RecVertexPositions(const RecVertexPositions & pos) = default;
    RecVertexPositions(RecVertexPositions && pos) = default;
    RecVertexPositions & operator=(const RecVertexPositions & pos) = default;
    RecVertexPositions & operator=(RecVertexPositions && pos) = default;
    RecVertexPositions(const Amg::VectorX &pos, const Amg::MatrixX &cov,
               const double ndf = 0., 
               const double chi2 = 0.,bool isWeightTimesPosition=false); 
    //-> added support for non integer degrees of freedom
    // Additional constructor for truth ?
    RecVertexPositions(const Amg::VectorX &pos, const double ndf = 0., const double chi2 =0.);

    virtual MsgStream& dump(MsgStream& sl) const;
    virtual std::ostream& dump(std::ostream& sl) const;
 
    virtual ~RecVertexPositions(); 
 
    Amg::MatrixX const &covariancePosition() const; 
 
    void setCovariancePosition(const Amg::MatrixX &);
 
    void setFitQuality(const Trk::FitQuality &);

    const Trk::FitQuality& fitQuality() const;
 
    const Amg::VectorX& weightTimesPosition();
 
    // Use storing weight matrix * position instead of position 
    // saves you from inverting the weight matrix at every fit iteration 
    // Then transparently, asking the position for the first time, 
    // the m_position will be restored to the correct value of position 
    // (using the invertion of the weight matrix only once...)
    void setWeightTimesPosition(const Amg::VectorX &);
 
    //the finalizePosition() method is used to ask the RecVertexPositions class 
    //to invert the weight matrix and fill the m_position vector with the real 
    //position, in order to finalize the position (and make it available)
    void finalizePosition();
 
  private:
    Amg::MatrixX m_positionError; 
    Trk::FitQuality m_fitQuality; //chi2 and number of degrees of freedom of the fit
  };
 
 
} // end of namespace
#endif