#ifndef ALIKALMANTRACK_H
#define ALIKALMANTRACK_H

/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

//-------------------------------------------------------------------------
//                          Class AliKalmanTrack
//
//         Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch 
//-------------------------------------------------------------------------

#include <TObject.h>

class AliCluster;

class AliKalmanTrack : public TObject {
public:
  AliKalmanTrack();
  AliKalmanTrack(const AliKalmanTrack &t);

  virtual ~AliKalmanTrack(){};
  void SetLabel(Int_t lab) {fLab=lab;}

  Bool_t   IsSortable() const {return kTRUE;}
  Int_t    GetLabel()   const {return fLab;}
  Double_t GetChi2()    const {return fChi2;}
  Double_t GetMass()    const {return fMass;}
  Int_t    GetNumberOfClusters() const {return fN;}
  virtual Int_t GetClusterIndex(Int_t) const { //reserved for AliTracker
    Warning("GetClusterIndex(Int_t)","Method must be overloaded !\n");
    return 0;
  } 

  virtual Int_t Compare(const TObject *) const {return 0;} 

  virtual void GetExternalParameters(Double_t &/*xr*/, Double_t /*x*/[5]) const {}
  virtual void GetExternalCovariance(Double_t /*cov*/[15]) const {}

  virtual Double_t GetPredictedChi2(const AliCluster *) const {return 0.;}
  virtual 
    Int_t PropagateTo(Double_t /*xr*/, Double_t /*x0*/, Double_t /*rho*/) {return 0;}
  virtual Int_t Update(const AliCluster*, Double_t /*chi2*/, UInt_t) {return 0;}

  static void SetConvConst(Double_t cc) {fConvConst=cc;}
  Double_t GetConvConst() const {return fConvConst;}

  static void SetMagneticField(Double_t f) {// f - Magnetic field in T
    fConvConst=100/0.299792458/f;
  }
  Double_t GetMagneticField() const {return 100/0.299792458/fConvConst;}

protected:
  void SetChi2(Double_t chi2) {fChi2=chi2;} 
  void SetMass(Double_t mass) {fMass=mass;}
  void SetNumberOfClusters(Int_t n) {fN=n;} 

private: 
  Int_t fLab;             // track label
  Double_t fChi2;         // total chi2 value for this track
  Double_t fMass;         // mass hypothesis
  Int_t fN;               // number of associated clusters

  static Double_t fConvConst; //conversion constant cm -> GeV/c

  ClassDef(AliKalmanTrack,1)    // Reconstructed track
};

#endif