IVertexCascadeFitter.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
// IVertexCascadeFitter.h  - 
//---------------------------------------------------------------
#ifndef TRKVKALVRTFITTER_IVERTEXCASCADEFITTER_H
#define TRKVKALVRTFITTER_IVERTEXCASCADEFITTER_H
 
// Gaudi includes
#include "GaudiKernel/IAlgTool.h"
//
#include  "xAODTracking/TrackParticleFwd.h"
#include  "TrkVKalVrtFitter/IVKalState.h"
#include <memory>
#include <vector>
#include <span>
 
class EventContext;
 
namespace Trk{
  class Vertex;
  class IVKalState;
  class VxCascadeInfo;
 
  typedef int VertexID;
 
  class IVertexCascadeFitter : virtual public IAlgTool {
    public:
      DeclareInterfaceID(IVertexCascadeFitter, 1, 0);
 
     /*
      * Context aware method
      */
      virtual std::unique_ptr<IVKalState> makeState(const EventContext& ctx) const = 0;
      
      virtual VertexID startVertex(const  std::vector<const xAOD::TrackParticle*> & list,
                                   std::span<const double> particleMass,
                                   IVKalState& istate,
                   double massConstraint = 0.) const = 0;
 
      virtual VertexID  nextVertex(const  std::vector<const xAOD::TrackParticle*> & list,
                                   std::span<const double> particleMass,
                                   IVKalState& istate,
                   double massConstraint = 0.) const = 0;
 
      virtual VertexID  nextVertex(const  std::vector<const xAOD::TrackParticle*> & list,
                                   std::span<const double> particleMass,
                           const  std::vector<VertexID> &precedingVertices,
                                   IVKalState& istate,
                   double massConstraint = 0.) const = 0;
 
      virtual VxCascadeInfo * fitCascade(IVKalState& istate,
                                         const Vertex * primVertex = 0, bool FirstDecayAtPV = false ) const = 0;
 
      virtual StatusCode  addMassConstraint(VertexID Vertex,
                                         const std::vector<const xAOD::TrackParticle*> & tracksInConstraint,
                                         const std::vector<VertexID> &verticesInConstraint, 
                                         IVKalState& istate,
                         double massConstraint ) const = 0;
 
   };
 
} //end of namespace
 
#endif