Bug fix for CPV-EMC distance

[u/mrichter/AliRoot.git] / PHOS / AliPHOSCalibrationDB.cxx

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 * Author: The ALICE Off-line Project.                                    *
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/* $Id$ */

//_________________________________________________________________________
// Short description  
//
//*-- Author :  D.Peressounko (RRC KI & SUBATECH) 
//////////////////////////////////////////////////////////////////////////////

// --- ROOT system ---

// --- Standard library ---

// --- AliRoot header files ---
#include "AliLog.h"  
#include "AliPHOSCalibrManager.h"
#include "AliPHOSCalibrationDB.h"
ClassImp(AliPHOSCalibrationDB)


//____________________________________________________________________________ 
  AliPHOSCalibrationDB::AliPHOSCalibrationDB():fPedestals(), fGains()
{
}
//____________________________________________________________________________ 
AliPHOSCalibrationDB::AliPHOSCalibrationDB(const char * database):
  TNamed("AliPHOSCalibrationDB",database),fPedestals("Pedestals"),fGains("Gains"){

} 
//____________________________________________________________________________ 
  AliPHOSCalibrationDB::~AliPHOSCalibrationDB()
{
}
//____________________________________________________________________________ 
Float_t AliPHOSCalibrationDB::Calibrate(Int_t amp, Int_t absId)const 
{
  //if absID is known, return calibrated energy, else - zero
  Float_t ret = (amp - fPedestals.Data(absId))*fGains.Data(absId); 
  if(ret > 0)
    return ret ;
  else
    return 0.0000001 ; //Should not be zero - to avoid FPE
}

//____________________________________________________________________________
void AliPHOSCalibrationDB::GetParameters(void){
  //In this method we read calibration parameters using AliPHOSCalibrManager
  //This manager should be configured to read from correct source.

  AliPHOSCalibrManager * man = AliPHOSCalibrManager::GetInstance() ;
  if(!man){
    Error("GetParameters","AliPHOSCalibrManager not instanciated") ;
    return ;
  }


  man->GetParameters(fPedestals) ;
  man->GetParameters(fGains) ;
}

//____________________________________________________________________________
AliPHOSCalibrationDB& AliPHOSCalibrationDB::operator=(AliPHOSCalibrationDB const & cdb)
{
  //
  fPedestals=cdb.fPedestals ;
  fGains = cdb.fGains;
  return *this ;
}