#ifndef ALIFLATEXTERNALTRACKPARAM_H
#define ALIFLATEXTERNALTRACKPARAM_H

/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               *
 * Primary Authors : Sergey Gorbunov, Jochen Thaeder, Chiara Zampolli     */

/**
 * >> Flat structure representing parameters of an external track  <<
 */

#include "Rtypes.h"
#include "AliVVexternalTrackParam.h"
#include "AliFlatESDMisc.h"


class AliFlatExternalTrackParam: public AliVVexternalTrackParam
{
 public:
  AliFlatExternalTrackParam()	
	: fAlpha(0.), fX(0.), fY(0.), fZ(0.), fSnp(0.), fTgl(0.), fSigned1Pt(0.) {
    for( int i=0; i<15; i++) fC[i] = 0;
	}
  virtual ~AliFlatExternalTrackParam() {}
  Float_t fAlpha;     // azimuthal angle of reference frame
  Float_t fX;         // x: radial distance
  Float_t fY;         // local Y-coordinate of a track (cm)
  Float_t fZ;         // local Z-coordinate of a track (cm)
  Float_t fSnp;       // local sine of the track momentum azimuthal angle
  Float_t fTgl;       // tangent of the track momentum dip angle
  Float_t fSigned1Pt; // 1/pt (1/(GeV/c))
  Float_t fC[15];     // covariance matrix

  void SetAlpha(Float_t alpha)             {fAlpha = alpha;}
  void SetX(Float_t x)                     {fX = x;}
  void SetY(Float_t y)                     {fY = y;}
  void SetZ(Float_t z)                     {fZ = z;}
  void SetSnp(Float_t snp)                 {fSnp = snp;}
  void SetTgl(Float_t tgl)                 {fTgl = tgl;}
  void SetSigned1Pt(Float_t signed1Pt)     {fSigned1Pt = signed1Pt;}
  void SetCovEntry(Int_t idx, Float_t cov) {(idx >= 0 && idx < 15) ? fC[idx] = cov : 0.;}
  
  void Reinitialize(){
  	new (this) AliFlatExternalTrackParam(AliFlatESDReinitialize);
  }

  Float_t  GetAlpha()             const {return fAlpha;}
  Float_t  GetX()                 const {return fX;}
  Float_t  GetY()                 const {return fY;}
  Float_t  GetZ()                 const {return fZ;}
  Float_t  GetSnp()               const {return fSnp;}
  Float_t  GetTgl()               const {return fTgl;}
  Float_t  GetSigned1Pt()         const {return fSigned1Pt;}
  Float_t* GetCov()               const {return const_cast<Float_t*>(fC);}
  Float_t  GetCovEntry(Int_t idx) const {return (idx >= 0 && idx < 15) ? fC[idx] : 0.;}
  
 private:
 	AliFlatExternalTrackParam(AliFlatESDSpecialConstructorFlag)
	: fAlpha(this->fAlpha), fX(this->fX), fY(this->fY), fZ(this->fZ), fSnp(this->fSnp), fTgl(this->fTgl), fSigned1Pt(this->fSigned1Pt) {}
};

//typedef struct AliFlatExternalTrackParam AliFlatExternalTrackParam;

#endif