Default arguments set only in the header file

[u/mrichter/AliRoot.git] / EMCAL / AliEMCALDigitizer.cxx

/**************************************************************************


 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *


 *                                                                        *


 * Author: The ALICE Off-line Project.                                    *


 * Contributors are mentioned in the code where appropriate.              *


 *                                                                        *


 * Permission to use, copy, modify and distribute this software and its   *


 * documentation strictly for non-commercial purposes is hereby granted   *


 * without fee, provided that the above copyright notice appears in all   *


 * copies and that both the copyright notice and this permission notice   *


 * appear in the supporting documentation. The authors make no claims     *


 * about the suitability of this software for any purpose. It is          *


 * provided "as is" without express or implied warranty.                  *


 **************************************************************************/





/* $Id$ */





//_________________________________________________________________________


// 


//////////////////////////////////////////////////////////////////////////////


// Class performs digitization of Summable digits 


//  


// In addition it performs mixing of summable digits from different events.


//


// For each event two branches are created in TreeD:


//   "EMCAL" - list of digits


//   "AliEMCALDigitizer" - AliEMCALDigitizer with all parameters used in digitization


//


// Note, that one cset title for new digits branch, and repeat digitization with


// another set of parameters.


//


// Examples of use:


// root[0] AliEMCALDigitizer * d = new AliEMCALDigitizer() ;


// root[1] d->ExecuteTask()             


// Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated


//                       //Digitizes SDigitis in all events found in file galice.root 


//


// root[2] AliEMCALDigitizer * d1 = new AliEMCALDigitizer("galice1.root") ;  


//                       // Will read sdigits from galice1.root


// root[3] d1->MixWith("galice2.root")       


// Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated


//                       // Reads another portion of sdigits from galice2.root


// root[3] d1->MixWith("galice3.root")       


//                       // Reads another portion of sdigits from galice3.root


// root[4] d->ExecuteTask("deb timing")    


//                       // Reads SDigits from files galice1.root, galice2.root ....


//                       // mixes them and stores produced Digits in file galice1.root          


//                       // deb - prints number of produced digits


//                       // deb all - prints list of produced digits


//                       // timing  - prints time used for digitization


////////////////////////////////////////////////////////////////////////////////////


//


//*-- Author: Sahal Yacoob (LBL)


// based on : AliEMCALDigitizer


//_________________________________________________________________________________





// --- ROOT system ---


#include "TFile.h"


#include "TTree.h"


#include "TSystem.h"


#include "TROOT.h"


#include "TFolder.h"


#include "TObjString.h"


#include "TBenchmark.h"


// --- Standard library ---


#include <iomanip.h>





// --- AliRoot header files ---





#include "AliRun.h"


#include "AliEMCALDigit.h"


#include "AliEMCALHit.h"


#include "AliEMCALTick.h"


#include "AliEMCALv1.h"


#include "AliEMCALDigitizer.h"


#include "AliEMCALSDigitizer.h"


#include "AliEMCALGeometry.h"


#include "AliEMCALGetter.h"


#include "AliRunDigitizer.h"


ClassImp(AliEMCALDigitizer)








//____________________________________________________________________________ 


  AliEMCALDigitizer::AliEMCALDigitizer()


{


  // ctor





  fSDigitizer = 0 ;


  fNinputs = 0 ;


  fPinNoise = 0.0 ;


  fTowerDigitThreshold = 0.0 ;


  fTimeResolution     = 0. ;


  fTimeSignalLength   = 0. ;


  fPreShowerDigitThreshold = 0. ;


  fADCchannelTower = 0.0;      // width of one ADC channel in GeV


  fADCpedestalTower = 0. ;      // pedestal of ADC


  fNADCTower = 0;  // number of channels in Tower ADC





  fADCchannelPreSho  = 0.0;          // width of one ADC channel in Pre Shower


  fADCpedestalPreSho = 0.0 ;         // pedestal of ADC


  fNADCPreSho = 0;      // number of channels in Pre Shower ADC


  fTimeThreshold = 0.0; //Means 1 MeV in terms of SDigits amplitude


  fManager = 0 ;











}


//____________________________________________________________________________ 


Bool_t AliEMCALDigitizer::Init()


{


  // Makes all memory allocations





  fSDigitizer = 0 ;


  fNinputs = 1 ;


  fPinNoise = 0.00001 ;


  fTowerDigitThreshold = 0.001 ;


  fTimeResolution     = 0.5e-9 ;


  fTimeSignalLength   = 1.0e-9 ;


  fPreShowerDigitThreshold = fTowerDigitThreshold/25. ;


  fInitialized = kFALSE ;


  fADCchannelTower = 0.000220;       // width of one ADC channel in GeV


  fADCpedestalTower = 0.005 ;      // GeV


  fNADCTower = (Int_t) TMath::Power(2,16) ;  // number of channels in Tower ADC





  fADCchannelPreSho = 0.0000300;          // width of one ADC channel in Pre Shower


  fADCpedestalPreSho = 0.005 ;         // 


  fNADCPreSho = (Int_t) TMath::Power(2,12);      // number of channels in Pre ShowerADC





  fTimeThreshold = 0.001*10000000 ; //Means 1 MeV in terms of SDigits amplitude


 








if(fManager)


    SetTitle("aliroot") ;


  else if (strcmp(GetTitle(),"")==0) 


   SetTitle("galice.root") ;





  if( strcmp(GetName(), "") == 0 )


    SetName("Default") ;


  


  AliEMCALGetter * gime = AliEMCALGetter::GetInstance(GetTitle(), GetName(), "update") ; 


  if ( gime == 0 ) {


    cerr << "ERROR: AliEMCALDigitizer::Init -> Could not obtain the Getter object !" << endl ; 


    return kFALSE;


  } 


  


  //const AliEMCALGeometry * geom = gime->EMCALGeometry() ;


  //fEmcCrystals = geom->GetNModules() *  geom->GetNCristalsInModule() ;


  


  // Post Digits to the white board


  gime->PostDigits(GetName() ) ;   


  


  // Post Digitizer to the white board


  gime->PostDigitizer(this) ;


  


  //Mark that we will use current header file


  if(!fManager){


    gime->PostSDigits(GetName(),GetTitle()) ;


    gime->PostSDigitizer(GetName(),GetTitle()) ;


  }


  return kTRUE ;


  


 


  


}





//____________________________________________________________________________ 


AliEMCALDigitizer::AliEMCALDigitizer(const char *headerFile,const char *name)


{


   SetName(name) ;


  SetTitle(headerFile) ;


  fManager = 0 ;                     // We work in the standalong mode


  Init() ;


  





  


}


//____________________________________________________________________________ 


AliEMCALDigitizer::AliEMCALDigitizer(AliRunDigitizer * ard):AliDigitizer(ard)


{


  // ctor


  SetName("");     //Will call init in the digitizing


  SetTitle("aliroot") ;  


}





//____________________________________________________________________________ 


  AliEMCALDigitizer::~AliEMCALDigitizer()


{


  // dtor





}


//____________________________________________________________________________


void AliEMCALDigitizer::Reset() { 


  //sets current event number to the first simulated event


if( strcmp(GetName(), "") == 0 )


  Init() ;





      // Int_t inputs ;


      // for(inputs = 0; inputs < fNinputs ;inputs++)


      //  fIevent->AddAt(-1, inputs ) ;


  


}





//____________________________________________________________________________


void AliEMCALDigitizer::Digitize(const Int_t event) { 





  // Makes the digitization of the collected summable digits


  // for this it first creates the array of all EMCAL modules


  // filled with noise (different for EMC, CPV and PPSD) and


  // after that adds contributions from SDigits. This design 


  // helps to avoid scanning over the list of digits to add 


  // contribution of any new SDigit.





  AliEMCALGetter * gime = AliEMCALGetter::GetInstance() ; 


  TClonesArray * digits = gime->Digits(GetName()) ; 


  


  digits->Clear() ;





    const AliEMCALGeometry *geom = gime->EMCALGeometry() ; 








  //Making digits with noise, first EMC


  Int_t nEMC = 2*geom->GetNPhi()*geom->GetNZ();


  Int_t absID ;


  TString name      =  geom->GetName() ;





 // get first the sdigitizer from the tasks list (must have same name as the digitizer)


  const AliEMCALSDigitizer * sDigitizer = gime->SDigitizer(GetName()); 


  if ( !sDigitizer) {


    cerr << "ERROR: AliEMCALDigitizer::Digitize -> SDigitizer with name " << GetName() << " not found " << endl ; 


    abort() ; 


  }





// loop through the sdigits posted to the White Board and add them to the noise


  TCollection * folderslist = gime->SDigitsFolder()->GetListOfFolders() ; 


  TIter next(folderslist) ; 


  TFolder * folder = 0 ; 


  TClonesArray * sdigits = 0 ;


  Int_t input = 0 ;


  TObjArray * sdigArray = new TObjArray(2) ;


  while ( (folder = (TFolder*)next()) ) 


    if ( (sdigits = (TClonesArray*)folder->FindObject(GetName()) ) ) {


      cout << "INFO: AliEMCALDigitizer::Digitize -> Adding SDigits " 


	   << GetName() << " from " << folder->GetName() << endl ; 


      sdigArray->AddAt(sdigits, input) ;


      input++ ;


    }





  //Find the first tower with signal


  Int_t nextSig = 200000 ; 


  Int_t i;


  for(i=0; i<input; i++){


    sdigits = (TClonesArray *)sdigArray->At(i) ;


    if ( !sdigits->GetEntriesFast() )


      continue ; 


    Int_t curNext = ((AliEMCALDigit *)sdigits->At(0))->GetId() ;


     if(curNext < nextSig) 


       nextSig = curNext ;


  }





  TArrayI index(input) ;


  index.Reset() ;  //Set all indexes to zero





  AliEMCALDigit * digit = 0 ;


  AliEMCALDigit * curSDigit = 0 ;





  TClonesArray * ticks = new TClonesArray("AliEMCALTick",1000) ;





  //Put Noise contribution


  for(absID = 1; absID <= nEMC; absID++){


    Float_t noise = gRandom->Gaus(0., fPinNoise); 


    new((*digits)[absID-1]) AliEMCALDigit( -1, -1, absID,sDigitizer->Digitize(noise), TimeOfNoise() ) ;


    //look if we have to add signal?


    if(absID==nextSig){


      //Add SDigits from all inputs 


      digit = (AliEMCALDigit *) digits->At(absID-1) ;


      


      ticks->Clear() ;


      Int_t contrib = 0 ;


      Float_t a = digit->GetAmp() ;


      Float_t b = TMath::Abs( a /fTimeSignalLength) ;


      //Mark the beginnign of the signal


      new((*ticks)[contrib++]) AliEMCALTick(digit->GetTime(),0, b);  


      //Mark the end of the ignal     


      new((*ticks)[contrib++]) AliEMCALTick(digit->GetTime()+fTimeSignalLength, -a, -b);


      


 // loop over input


  


      for(i = 0; i< input ; i++){  //loop over (possible) merge sources


    	if(((TClonesArray *)sdigArray->At(i))->GetEntriesFast() > index[i] )


	  curSDigit = (AliEMCALDigit*)((TClonesArray *)sdigArray->At(i))->At(index[i]) ; 	


	else


	  curSDigit = 0 ;


	//May be several digits will contribute from the same input


	while(curSDigit && curSDigit->GetId() == absID){	   


	  //Shift primary to separate primaries belonging different inputs


	  Int_t primaryoffset ;


	  if(fManager)


	    primaryoffset = fManager->GetMask(i) ; 


	  else


	    primaryoffset = i ;


	  curSDigit->ShiftPrimary(primaryoffset) ;


	  


	  a = curSDigit->GetAmp() ;


	  b = a /fTimeSignalLength ;


	  new((*ticks)[contrib++]) AliEMCALTick(curSDigit->GetTime(),0, b);  


	  new((*ticks)[contrib++]) AliEMCALTick(curSDigit->GetTime()+fTimeSignalLength, -a, -b); 





	  *digit = *digit + *curSDigit ;  //add energies





	  index[i]++ ;


	  if(((TClonesArray *)sdigArray->At(i))->GetEntriesFast() > index[i] )


	    curSDigit = (AliEMCALDigit*)((TClonesArray *)sdigArray->At(i))->At(index[i]) ; 	


	  else


	    curSDigit = 0 ;


	}


      }





//calculate and set time


      Float_t time = FrontEdgeTime(ticks) ;


      digit->SetTime(time) ;





      //Find next signal module


      nextSig = 200000 ;


      for(i=0; i<input; i++){


	sdigits = ((TClonesArray *)sdigArray->At(i)) ;


	Int_t curNext = nextSig ;


	if(sdigits->GetEntriesFast() > index[i] ){


	  curNext = ((AliEMCALDigit *) sdigits->At(index[i]))->GetId() ;


	  


	}


	if(curNext < nextSig) nextSig = curNext ;


      }


    }


  }


  


  ticks->Delete() ;


  delete ticks ;














  //remove digits below thresholds


  for(absID = 0; absID < nEMC/2 ; absID++){


    if(sDigitizer->Calibrate(((AliEMCALDigit*)digits->At(absID))->GetAmp()) < fTowerDigitThreshold)


      digits->RemoveAt(absID) ;


    else


      digit->SetTime(gRandom->Gaus(digit->GetTime(),fTimeResolution) ) ;


  }


  


  for(absID = nEMC/2; absID < nEMC ; absID++){


    if(sDigitizer->Calibrate(((AliEMCALDigit*)digits->At(absID))->GetAmp()) < fPreShowerDigitThreshold)


      digits->RemoveAt(absID) ;


    else


      digit->SetTime(gRandom->Gaus(digit->GetTime(),fTimeResolution) ) ;


  }


  


  digits->Compress() ;  


  


  Int_t ndigits = digits->GetEntriesFast() ;


  


  digits->Expand(ndigits) ;


  


  


  //Set indexes in list of digits


  //Int_t i ;


 for (i = 0 ; i < ndigits ; i++) { 


    AliEMCALDigit * digit = (AliEMCALDigit *) digits->At(i) ; 


    digit->SetIndexInList(i) ; 


    Float_t energy = sDigitizer->Calibrate(digit->GetAmp()) ;


    digit->SetAmp(DigitizeEnergy(energy,digit->GetId()) ) ;


  }


}





//____________________________________________________________________________





Int_t AliEMCALDigitizer::DigitizeEnergy(Float_t energy, Int_t absId)


{ 


  Int_t channel = -999;


  Int_t nphi = AliEMCALGetter::GetInstance()->EMCALGeometry()->GetNPhi() ; 


  Int_t nz   = AliEMCALGetter::GetInstance()->EMCALGeometry()->GetNZ() ;


  


  if(absId <= nphi*nz){  //digitize as tower


    channel = static_cast<Int_t> (TMath::Ceil( (energy + fADCpedestalTower)/fADCchannelTower ))  ;


  if(channel > fNADCTower ) 


    channel =  fNADCTower ;


  } else {


    channel =  static_cast<Int_t>(TMath::Ceil( (energy + fADCpedestalPreSho)/fADCchannelPreSho ))  ;


  if(channel > fNADCPreSho ) 


    channel =  fNADCPreSho ;


  }


  


  return channel ;


}





//____________________________________________________________________________


void AliEMCALDigitizer::Exec(Option_t *option) { 


  // Managing method


if(strcmp(GetName(), "") == 0 )   


    Init() ;


  


  if (strstr(option,"print")) {


    Print("");


    return ; 


  }


  


  if(strstr(option,"tim"))


    gBenchmark->Start("EMCALDigitizer");





  AliEMCALGetter * gime = AliEMCALGetter::GetInstance() ;


  


  Int_t nevents ;


  


  TTree * treeD ;


  


  if(fManager){


    treeD = fManager->GetTreeD() ;


    nevents = 1 ;    // Will process only one event


  }


  else {


    gAlice->GetEvent(0) ;


    nevents = (Int_t) gAlice->TreeE()->GetEntries() ;


    treeD=gAlice->TreeD() ;


  }


  if(treeD == 0 ){


    cerr << " AliEMCALDigitizer :: Can not find TreeD " << endl ;


    return ;


  }





  //Check, if this branch already exits


  TObjArray * lob = (TObjArray*)treeD->GetListOfBranches() ;


  TIter next(lob) ; 


  TBranch * branch = 0 ;  


  Bool_t emcalfound = kFALSE, digitizerfound = kFALSE ; 


  


  while ( (branch = (TBranch*)next()) && (!emcalfound || !digitizerfound) ) {


    if ( (strcmp(branch->GetName(), "EMCAL")==0) && 


	 (strcmp(branch->GetTitle(), GetName())==0) ) 


      emcalfound = kTRUE ;


    


    else if ( (strcmp(branch->GetName(), "AliEMCALDigitizer")==0) && 


	      (strcmp(branch->GetTitle(), GetName())==0) ) 


      digitizerfound = kTRUE ; 


  }





  if ( emcalfound ) {


    cerr << "WARNING: AliEMCALDigitizer -> Digits branch with name " << GetName() 


	 << " already exits" << endl ;


    return ; 


  }   


  if ( digitizerfound ) {


    cerr << "WARNING: AliEMCALDigitizer -> Digitizer branch with name " << GetName() 


	 << " already exits" << endl ;


    return ; 


  }   





  Int_t ievent ;





  for(ievent = 0; ievent < nevents; ievent++){


    


    if(fManager){


      Int_t input ;


      for(input = 0 ; input < fManager->GetNinputs(); input ++){


  	TTree * treeS = fManager->GetInputTreeS(input) ;


	if(!treeS){


	  cerr << "AliEMCALDigitizer -> No Input " << endl ;


	  return ;


	}


	gime->ReadTreeS(treeS,input) ;


      }


    }


    else


      gime->Event(ievent,"S") ;


    


    Digitize(ievent) ; //Add prepared SDigits to digits and add the noise


    


    WriteDigits(ievent) ;


    


    if(strstr(option,"deb"))


      PrintDigits(option);


    


    //increment the total number of Digits per run 


    fDigitsInRun += gime->Digits()->GetEntriesFast() ;  


  }


  


  if(strstr(option,"tim")){


    gBenchmark->Stop("EMCALDigitizer");


    cout << "AliEMCALDigitizer:" << endl ;


    cout << "  took " << gBenchmark->GetCpuTime("EMCALDigitizer") << " seconds for Digitizing " 


	 <<  gBenchmark->GetCpuTime("EMCALDigitizer")/nevents << " seconds per event " << endl ;


    cout << endl ;


  }


  


}











//__________________________________________________________________


void AliEMCALDigitizer::MixWith(char* headerFile){


  // Alows produce digits by superimposing background and signal event.


  // It is assumed, that headers file with SIGNAL events is opened in 


  // constructor, and now we set the BACKGROUND event, with which we 


  // will mix. Thus we avoid writing (changing) huge and expencive 


  // backgound files: all output will be writen into SIGNAL, i.e. 


  // opened in constructor file. 


  //


  // One can open as many files to mix with as one wants.





if( strcmp(GetName(), "") == 0 )


    Init() ;


  


 if(fManager){


    cout << "Can not use this method under AliRunDigitizer " << endl ;


    return ;


  } // check if the specified SDigits do not already exist on the White Board:


  // //Folders/RunMC/Event/Data/EMCAL/SDigits/headerFile/sdigitsname





  TString path = "Folders/RunMC/Event/Data/EMCAL/SDigits" ; 


  path += headerFile ; 


  path += "/" ; 


  path += GetName() ;


  if ( gROOT->FindObjectAny(path.Data()) ) {


    cerr << "WARNING: AliEMCALDigitizer::MixWith -> Entry already exists, do not add" << endl ;


    return;


  }





  AliEMCALGetter * gime = AliEMCALGetter::GetInstance() ;


  gime->PostSDigits(GetName(),headerFile) ;


  


  // check if the requested file is already open or exist and if SDigits Branch exist


  TFile * file = (TFile*)gROOT->FindObject(headerFile); 


  if ( !file ) { 


    file = new TFile(headerFile, "READ") ; 


    if (!file) { 


      cerr << "ERROR: AliEMCALDigitizer::MixWith -> File " << headerFile << " does not exist!" << endl ; 


      return ; 


    }


  }


  


}


 


//__________________________________________________________________


void AliEMCALDigitizer::Print(Option_t* option)const {


  if( strcmp(GetName(), "") != 0) {


    


    cout << "------------------- "<< GetName() << " -------------" << endl ;


    cout << "Digitizing sDigits from file(s): " <<endl ;


    


  TCollection * folderslist = ((TFolder*)gROOT->FindObjectAny("Folders/RunMC/Event/Data/EMCAL/SDigits"))->GetListOfFolders() ; 


    TIter next(folderslist) ; 


    TFolder * folder = 0 ;


    while ( (folder = (TFolder*)next()) ) 


      if ( folder->FindObject(GetName())  ) 


	{


	cout << "Adding SDigits " << GetName() << " from " << folder->GetName() << endl ; 


      cout << endl ;


      cout << "Writing digits to " << GetTitle() << endl ;


      


      cout << endl ;


      cout << "With following parameters: " << endl ;


      cout << "     Electronics noise in EMC (fPinNoise) = " << fPinNoise << endl ;


      cout << "  Threshold  in EMC  (fTowerDigitThreshold) = " << fTowerDigitThreshold  << endl;


      cout << "  Threshold  in PreShower  (fPreShowerDigitThreshold) = " << fPreShowerDigitThreshold  << endl ; ;


      cout << "---------------------------------------------------" << endl ;


    }


    else


      cout << "AliEMCALDigitizer not initialized " << endl ;


    }


}





//__________________________________________________________________


void AliEMCALDigitizer::PrintDigits(Option_t * option){


    


  AliEMCALGetter * gime = AliEMCALGetter::GetInstance() ; 


  TClonesArray * fDigits = gime->Digits() ;





  cout << "AliEMCALDigitiser:"<< endl ;


  cout << "       Number of entries in Digits list " << fDigits->GetEntriesFast() << endl ;


  cout << endl ;


  if(strstr(option,"all")){


    


    //loop over digits


    AliEMCALDigit * digit;


    cout << "Digit Id " << " Amplitude " <<  " Index "  <<  " Nprim " << " Primaries list " <<  endl;      


    Int_t index ;


    for (index = 0 ; index < fDigits->GetEntries() ; index++) {


      digit = (AliEMCALDigit * )  fDigits->At(index) ;


      cout << setw(8)  <<  digit->GetId() << " "  << 	setw(3)  <<  digit->GetAmp() <<   "  "  


	   << setw(6)  <<  digit->GetIndexInList() << "  "   


	   << setw(5)  <<  digit->GetNprimary() <<"  ";


      


      Int_t iprimary;


      for (iprimary=0; iprimary<digit->GetNprimary(); iprimary++)


	cout << setw(5)  <<  digit->GetPrimary(iprimary+1) << " ";


      cout << endl;  	 


    }


    


  }


}


//_________________________________________________________________________________________


void AliEMCALDigitizer::WriteDigits(Int_t event)


{





  // Makes TreeD in the output file. 


  // Check if branch already exists: 


  //   if yes, exit without writing: ROOT TTree does not support overwriting/updating of 


  //      already existing branches. 


  //   else creates branch with Digits, named "EMCAL", title "...",


  //      and branch "AliEMCALDigitizer", with the same title to keep all the parameters


  //      and names of files, from which digits are made.





  AliEMCALGetter * gime = AliEMCALGetter::GetInstance() ; 


  const TClonesArray * digits = gime->Digits(GetName()) ; 


 TTree * treeD ;





  if(fManager)


    treeD = fManager->GetTreeD() ;


 else


    treeD = gAlice->TreeD();


  


  // create new branches


  // -- generate file name if necessary


  char * file =0;


  if(gSystem->Getenv("CONFIG_SPLIT_FILE")){ //generating file name


    file = new char[strlen(gAlice->GetBaseFile())+20] ;


    sprintf(file,"%s/EMCAL.Digits.root",gAlice->GetBaseFile()) ;


  }





  TDirectory *cwd = gDirectory;


  // -- create Digits branch


  Int_t bufferSize = 32000 ;    


  TBranch * digitsBranch = treeD->Branch("EMCAL",&digits,bufferSize);


  digitsBranch->SetTitle(GetName());


  if (file) {


    digitsBranch->SetFile(file);


    TIter next( digitsBranch->GetListOfBranches());


    TBranch * sbr ;


    while ((sbr=(TBranch*)next())) {


      sbr->SetFile(file);


    }   


    cwd->cd();


  } 


    


  // -- Create Digitizer branch


  Int_t splitlevel = 0 ;


  AliEMCALDigitizer * d = gime->Digitizer(GetName()) ;


  TBranch * digitizerBranch = treeD->Branch("AliEMCALDigitizer", "AliEMCALDigitizer", &d,bufferSize,splitlevel); 


  digitizerBranch->SetTitle(GetName());


  if (file) {


    digitizerBranch->SetFile(file);


    TIter next( digitizerBranch->GetListOfBranches());


    TBranch * sbr;


    while ((sbr=(TBranch*)next())) {


      sbr->SetFile(file);


    }   


    cwd->cd();


  }


  


  digitsBranch->Fill() ;      


  digitizerBranch->Fill() ;





  treeD->Write(0,kOverwrite) ;  


 


}


//____________________________________________________________________________ 


Float_t AliEMCALDigitizer::FrontEdgeTime(TClonesArray * ticks) 


{ // 


  ticks->Sort() ; //Sort in accordance with times of ticks


  TIter it(ticks) ;


  AliEMCALTick * ctick = (AliEMCALTick *) it.Next() ;


  Float_t time = ctick->CrossingTime(fTimeThreshold) ;    


  


  AliEMCALTick * t ;  


  while((t=(AliEMCALTick*) it.Next())){


    if(t->GetTime() < time)  //This tick starts before crossing


      *ctick+=*t ;


    else


      return time ;


    


    time = ctick->CrossingTime(fTimeThreshold) ;    


  }


  return time ;


}


//____________________________________________________________________________ 


Float_t AliEMCALDigitizer::TimeOfNoise(void)


{  // Calculates the time signal generated by noise


  //to be rewritten, now returns just big number


  return 1. ;





}


//____________________________________________________________________________


void AliEMCALDigitizer::SetSDigitsBranch(const char* title)


{


  // we set title (comment) of the SDigits branch in the first! header file


  if( strcmp(GetName(), "") == 0 )


    Init() ;





  AliEMCALGetter::GetInstance()->SDigits()->SetName(title) ; 


}