AliTPCCombinedTrackfit.h

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/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
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 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
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 * documentation strictly for non-commercial purposes is hereby granted   *
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 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
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/*
//in [cm]
const Double_t _TPCZMIN = -250;
const Double_t _TPCZMAX =  250;
const Double_t _TPCINR  =  84.8;
const Double_t _TPCOUR  =  246.6;
*/

#ifndef ALITPCCOMBINEDTRACKFIT_H
#define ALITPCCOMBINEDTRACKFIT_H

class TTreeSRedirector;

class AliTPCCombinedTrackfit
{
 public:
  AliTPCCombinedTrackfit(const Int_t dlev=0, const TString tag="test");
  
  ~AliTPCCombinedTrackfit();

  Bool_t CombineESDtracks(AliESDtrack * &trk0, AliESDtrack *&trk1);
  Bool_t CombineTPCseeds(AliTPCseed * &seed0, AliTPCseed *&seed1);
  void Print() const ;
  //--------- getters ------------

  Int_t GetStatus()const{return fStatus;}
  Int_t GetFitNcls()const{return fFitNcls;}
  Int_t GetMissNcls()const{return fMissNcls;}
  Double_t GetChi2PerCluster()const{return fPreChi2;}
  Double_t GetLeverArm()const {return fLeverArm;}
  TVector3 GetInnerClusterUp()const {return fInnerClusterUp;}
  TVector3 GetInnerClusterLow()const {return fInnerClusterLow;}
  Double_t ImpactParameter() const;
  Double_t MinPhi()const;

  AliExternalTrackParam * GetTrackParamUp() const {return fTrackparUp;}
  AliExternalTrackParam * GetTrackParamLow() const {return fTrackparLow;}
  AliTPCseed * GetTPCseedUp()   const {return fSeedUp;}
  AliTPCseed * GetTPCseedLow() const {return fSeedLow;}

  TTreeSRedirector * GetStreamer() const {return fStreamer;}

 private:
  enum CombineStatus{
    kFailGetTPCseeds=1,
    kFailNclsMin    =2,
    kFailSwapSeeds  =3,
    kFailLeverArm   =4,
    kFailMakeSeed   =5,
    kFailPropagation=6,
    kFailChi2       =7
  };
  
  AliTPCCombinedTrackfit(const AliTPCCombinedTrackfit & p);
  AliTPCCombinedTrackfit & operator=(const AliTPCCombinedTrackfit & p);

  void IniCombineESDtracks();
  Bool_t GetTPCseeds(const AliESDtrack *trk0,  const AliESDtrack *trk1);
  Bool_t CheckNcls();
  Bool_t CheckLeverArm();
  Bool_t AnaSeeds(Bool_t &kswap);

  void CombineTPCseeds(Bool_t &kswap);
  void Update();

  TTreeSRedirector *fStreamer;     
  Int_t fDebugLevel;                    

  AliTPCseed * fSeedUp;                         
  AliTPCseed * fSeedLow;                        
  AliExternalTrackParam * fTrackparUp;          
  AliExternalTrackParam * fTrackparLow;         

  Int_t fStatus;                               
  
  TVector3 fInnerClusterUp;                    
  TVector3 fInnerClusterLow;                   
  Double_t fLeverArm;                          

  Int_t fFitNcls;                              
  Int_t fMissNcls;                             
  Double_t fPreChi2;                           

  static const Double_t fgkCutLeverArm = 350;  
  static const Double_t fgkMaxChi2 = 10;       
};

#endif