/data/refman/pasoursint/CMSSW_4_1_8_patch9/src/RecoVertex/KinematicFitPrimitives/interface/KinematicParticle.h

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#ifndef KinematicParticle_H
#define KinematicParticle_H

#include "RecoVertex/KinematicFitPrimitives/interface/ParticleMass.h"
#include "RecoVertex/KinematicFitPrimitives/interface/KinematicState.h"
#include "RecoVertex/VertexPrimitives/interface/LinearizedTrackState.h"

#include "DataFormats/GeometrySurface/interface/ReferenceCounted.h"

class KinematicConstraint;
class KinematicTree;

class KinematicParticle : public ReferenceCounted 
{
public:

  typedef ReferenceCountingPointer<LinearizedTrackState<6> > RefCountedLinearizedTrackState;

 friend class KinematicParticleVertexFitter;
 friend class KinematicTree;

 KinematicParticle(){}
 
 virtual ~KinematicParticle(){}
                                                           
 virtual bool operator==(const KinematicParticle& other)const = 0;

 virtual bool operator==(const ReferenceCountingPointer<KinematicParticle>& other) const = 0;

 virtual bool operator!=(const KinematicParticle& other) const = 0;
  
 virtual bool operator<(const KinematicParticle& other)const;
  
 virtual KinematicState initialState()const;
 
 virtual KinematicState currentState()const;
 
 virtual KinematicState stateAtPoint(const GlobalPoint& point)const = 0;
 
 virtual ReferenceCountingPointer<KinematicParticle> refittedParticle(const KinematicState& state,
                               float chi2, float ndf, KinematicConstraint * cons = 0) const = 0;
                               
 virtual RefCountedLinearizedTrackState particleLinearizedTrackState(const GlobalPoint& point)const = 0;                               
  
 virtual KinematicConstraint * lastConstraint() const;
 
 virtual ReferenceCountingPointer<KinematicParticle> previousParticle() const;
  
 virtual KinematicTree * correspondingTree() const;
  
 virtual float chiSquared() const;
  
 virtual float degreesOfFreedom() const;
   
  const MagneticField* magneticField() const {return theField;}

  reco::TransientTrack refittedTransientTrack() const;

protected: 

 virtual void setTreePointer(KinematicTree * tr) const;
  
  const MagneticField* theField;

//pointer to the tree current
//particle  belongs to
 mutable  KinematicTree * tree;
 
//last constraint applied 
 mutable KinematicConstraint * lConstraint;

//previous particle
 mutable ReferenceCountingPointer<KinematicParticle> pState;
 
//initial kinematic state of
//current particle
 KinematicState initState; 
 
//particle state at point  
 mutable KinematicState cState;
  
//chi2 and number of degrees of freedom
 float chi2;
  
 float ndf;  
};
#endif