1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 //_________________________________________________________________________
19 //*-- Author : Dmitri Peressounko (SUBATECH & Kurchatov Institute)
20 //////////////////////////////////////////////////////////////////////////////
21 // This TTask performs digitization of Summable digits (in the PHOS case it is just
22 // the sum of contributions from all primary particles into a given cell).
23 // In addition it performs mixing of summable digits from different events.
24 // The name of the TTask is also the title of the branch that will contain
25 // the created SDigits
26 // The title of the TTAsk is the name of the file that contains the hits from
27 // which the SDigits are created
29 // For each event two branches are created in TreeD:
30 // "PHOS" - list of digits
31 // "AliPHOSDigitizer" - AliPHOSDigitizer with all parameters used in digitization
33 // Note, that one can set a title for new digits branch, and repeat digitization with
34 // another set of parameters.
37 // root[0] AliPHOSDigitizer * d = new AliPHOSDigitizer() ;
38 // root[1] d->ExecuteTask()
39 // Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
40 // //Digitizes SDigitis in all events found in file galice.root
42 // root[2] AliPHOSDigitizer * d1 = new AliPHOSDigitizer("galice1.root") ;
43 // // Will read sdigits from galice1.root
44 // root[3] d1->MixWith("galice2.root")
45 // Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
46 // // Reads another set of sdigits from galice2.root
47 // root[3] d1->MixWith("galice3.root")
48 // // Reads another set of sdigits from galice3.root
49 // root[4] d->ExecuteTask("deb timing")
50 // // Reads SDigits from files galice1.root, galice2.root ....
51 // // mixes them and stores produced Digits in file galice1.root
52 // // deb - prints number of produced digits
53 // // deb all - prints list of produced digits
54 // // timing - prints time used for digitization
57 // --- ROOT system ---
63 #include "TObjString.h"
64 #include "TGeometry.h"
65 #include "TBenchmark.h"
67 // --- Standard library ---
70 // --- AliRoot header files ---
72 #include "AliHeader.h"
73 #include "AliStream.h"
74 #include "AliRunDigitizer.h"
75 #include "AliPHOSDigit.h"
77 #include "AliPHOSGetter.h"
78 #include "AliPHOSDigitizer.h"
79 #include "AliPHOSSDigitizer.h"
80 #include "AliPHOSGeometry.h"
81 #include "AliPHOSTick.h"
83 ClassImp(AliPHOSDigitizer)
86 //____________________________________________________________________________
87 AliPHOSDigitizer::AliPHOSDigitizer()
91 fDefaultInit = kTRUE ;
92 fManager = 0 ; // We work in the standalong mode
96 //____________________________________________________________________________
97 AliPHOSDigitizer::AliPHOSDigitizer(const char *headerFile, const char * name, const Bool_t toSplit)
101 SetTitle(headerFile) ;
103 fManager = 0 ; // We work in the standalong mode
108 fDefaultInit = kFALSE ;
111 //____________________________________________________________________________
112 AliPHOSDigitizer::AliPHOSDigitizer(AliRunDigitizer * ard):AliDigitizer(ard)
115 SetTitle(ard->GetInputFileName(0,0)) ;
117 fDefaultInit = kFALSE ;
120 if (ard->GetOutputFile()) {
121 SetName(ard->GetOutputFile().Data());
129 //____________________________________________________________________________
130 AliPHOSDigitizer::~AliPHOSDigitizer()
137 //____________________________________________________________________________
138 void AliPHOSDigitizer::Digitize(const Int_t event)
141 // Makes the digitization of the collected summable digits.
142 // It first creates the array of all PHOS modules
143 // filled with noise (different for EMC, CPV and PPSD) and
144 // then adds contributions from SDigits.
145 // This design avoids scanning over the list of digits to add
146 // contribution to new SDigits only.
148 AliPHOSGetter * gime = AliPHOSGetter::GetInstance() ;
149 TClonesArray * digits = gime->Digits(GetName()) ;
153 const AliPHOSGeometry *geom = gime->PHOSGeometry() ;
154 //Making digits with noise, first EMC
155 Int_t nEMC = geom->GetNModules()*geom->GetNPhi()*geom->GetNZ();
159 TString name = geom->GetName() ;
161 nCPV = nEMC + geom->GetNumberOfCPVPadsZ()*geom->GetNumberOfCPVPadsPhi()*
162 geom->GetNModules() ;
164 digits->Expand(nCPV) ;
166 // get first the sdigitizer from the tasks list (must have same name as the digitizer)
167 const AliPHOSSDigitizer * sDigitizer = gime->SDigitizer(GetName());
169 cerr << "ERROR: AliPHOSDigitizer::Digitize -> SDigitizer with name " << GetName() << " not found " << endl ;
173 // loop through the sdigits posted to the White Board and add them to the noise
174 TCollection * folderslist = gime->SDigitsFolder()->GetListOfFolders() ;
175 TIter next(folderslist) ;
176 TFolder * folder = 0 ;
177 TClonesArray * sdigits = 0 ;
179 TObjArray * sdigArray = new TObjArray(2) ;
180 while ( (folder = (TFolder*)next()) ) {
181 if ( (sdigits = (TClonesArray*)folder->FindObject(GetName()) ) ) {
182 TString fileName(folder->GetName()) ;
183 fileName.ReplaceAll("_","/") ;
184 // cout << "INFO: AliPHOSDigitizer::Digitize -> Adding SDigits "
185 // << GetName() << " from " << fileName << endl ;
186 sdigArray->AddAt(sdigits, input) ;
191 //Find the first crystall with signal
192 Int_t nextSig = 200000 ;
194 for(i=0; i<input; i++){
195 sdigits = (TClonesArray *)sdigArray->At(i) ;
196 if ( !sdigits->GetEntriesFast() )
198 Int_t curNext = ((AliPHOSDigit *)sdigits->At(0))->GetId() ;
199 if(curNext < nextSig)
203 TArrayI index(input) ;
204 index.Reset() ; //Set all indexes to zero
206 AliPHOSDigit * digit ;
207 AliPHOSDigit * curSDigit ;
209 TClonesArray * ticks = new TClonesArray("AliPHOSTick",1000) ;
211 //Put Noise contribution
212 for(absID = 1; absID <= nEMC; absID++){
213 Float_t noise = gRandom->Gaus(0., fPinNoise) ;
214 new((*digits)[absID-1]) AliPHOSDigit( -1,absID,sDigitizer->Digitize(noise), TimeOfNoise() ) ;
215 //look if we have to add signal?
216 digit = (AliPHOSDigit *) digits->At(absID-1) ;
219 //Add SDigits from all inputs
222 Float_t a = digit->GetAmp() ;
223 Float_t b = TMath::Abs( a /fTimeSignalLength) ;
224 //Mark the beginnign of the signal
225 new((*ticks)[contrib++]) AliPHOSTick(digit->GetTime(),0, b);
226 //Mark the end of the ignal
227 new((*ticks)[contrib++]) AliPHOSTick(digit->GetTime()+fTimeSignalLength, -a, -b);
230 for(i=0; i<input; i++){
231 if(((TClonesArray *)sdigArray->At(i))->GetEntriesFast() > index[i] )
232 curSDigit = (AliPHOSDigit*)((TClonesArray *)sdigArray->At(i))->At(index[i]) ;
235 //May be several digits will contribute from the same input
236 while(curSDigit && curSDigit->GetId() == absID){
237 //Shift primary to separate primaries belonging different inputs
238 Int_t primaryoffset ;
240 primaryoffset = fManager->GetMask(i) ;
242 primaryoffset = 10000000*i ;
243 curSDigit->ShiftPrimary(primaryoffset) ;
245 a = curSDigit->GetAmp() ;
246 b = a /fTimeSignalLength ;
247 new((*ticks)[contrib++]) AliPHOSTick(curSDigit->GetTime(),0, b);
248 new((*ticks)[contrib++]) AliPHOSTick(curSDigit->GetTime()+fTimeSignalLength, -a, -b);
250 *digit = *digit + *curSDigit ; //add energies
253 if(((TClonesArray *)sdigArray->At(i))->GetEntriesFast() > index[i] )
254 curSDigit = (AliPHOSDigit*)((TClonesArray *)sdigArray->At(i))->At(index[i]) ;
260 //calculate and set time
261 Float_t time = FrontEdgeTime(ticks) ;
262 digit->SetTime(time) ;
264 //Find next signal module
266 for(i=0; i<input; i++){
267 sdigits = ((TClonesArray *)sdigArray->At(i)) ;
268 Int_t curNext = nextSig ;
269 if(sdigits->GetEntriesFast() > index[i] ){
270 curNext = ((AliPHOSDigit *) sdigits->At(index[i]))->GetId() ;
273 if(curNext < nextSig) nextSig = curNext ;
282 //Now CPV digits (different noise and no timing)
283 for(absID = nEMC+1; absID <= nCPV; absID++){
284 Float_t noise = gRandom->Gaus(0., fCPVNoise) ;
285 new((*digits)[absID-1]) AliPHOSDigit( -1,absID,sDigitizer->Digitize(noise), TimeOfNoise() ) ;
286 //look if we have to add signal?
288 digit = (AliPHOSDigit *) digits->At(absID-1) ;
289 //Add SDigits from all inputs
290 for(i=0; i<input; i++){
291 if(((TClonesArray *)sdigArray->At(i))->GetEntriesFast() > index[i] )
292 curSDigit = (AliPHOSDigit*)((TClonesArray *)sdigArray->At(i))->At(index[i]) ;
296 //May be several digits will contribute from the same input
297 while(curSDigit && curSDigit->GetId() == absID){
298 //Shift primary to separate primaries belonging different inputs
299 Int_t primaryoffset ;
301 primaryoffset = fManager->GetMask(i) ;
303 primaryoffset = 10000000*i ;
304 curSDigit->ShiftPrimary(primaryoffset) ;
307 *digit = *digit + *curSDigit ;
309 if(((TClonesArray *)sdigArray->At(i))->GetEntriesFast() > index[i] )
310 curSDigit = (AliPHOSDigit*)((TClonesArray *)sdigArray->At(i))->At(index[i]) ;
316 //Find next signal module
318 for(i=0; i<input; i++){
319 sdigits = (TClonesArray *)sdigArray->At(i) ;
320 Int_t curNext = nextSig ;
321 if(sdigits->GetEntriesFast() > index[i] )
322 curNext = ((AliPHOSDigit *) sdigits->At(index[i]))->GetId() ;
323 if(curNext < nextSig) nextSig = curNext ;
328 delete sdigArray ; //We should not delete its contents
332 //remove digits below thresholds
333 for(i = 0; i < nEMC ; i++){
334 digit = dynamic_cast<AliPHOSDigit*>( digits->At(i) ) ;
335 if(sDigitizer->Calibrate( digit->GetAmp() ) < fEMCDigitThreshold)
336 digits->RemoveAt(i) ;
338 digit->SetTime(gRandom->Gaus(digit->GetTime(),fTimeResolution) ) ;
342 for(i = nEMC; i < nCPV ; i++)
343 if(sDigitizer->Calibrate(((AliPHOSDigit*)digits->At(i))->GetAmp()) < fCPVDigitThreshold)
344 digits->RemoveAt(i) ;
348 Int_t ndigits = digits->GetEntriesFast() ;
349 digits->Expand(ndigits) ;
351 //Set indexes in list of digits and make true digitization of the energy
352 for (i = 0 ; i < ndigits ; i++) {
353 digit = dynamic_cast<AliPHOSDigit*>( digits->At(i) ) ;
354 digit->SetIndexInList(i) ;
355 Float_t energy = sDigitizer->Calibrate(digit->GetAmp()) ;
356 digit->SetAmp(DigitizeEnergy(energy,digit->GetId()) ) ;
361 //____________________________________________________________________________
362 Int_t AliPHOSDigitizer::DigitizeEnergy(Float_t energy, Int_t absId)
365 if(absId <= fEmcCrystals){ //digitize as EMC
366 chanel = (Int_t) TMath::Ceil((energy - fADCpedestalEmc)/fADCchanelEmc) ;
367 if(chanel > fNADCemc ) chanel = fNADCemc ;
369 else{ //Digitize as CPV
370 chanel = (Int_t) TMath::Ceil((energy - fADCpedestalCpv)/fADCchanelCpv) ;
371 if(chanel > fNADCcpv ) chanel = fNADCcpv ;
376 //____________________________________________________________________________
377 void AliPHOSDigitizer::Exec(Option_t *option)
381 if(strcmp(GetName(), "") == 0 )
383 if (strstr(option,"print")) {
388 if(strstr(option,"tim"))
389 gBenchmark->Start("PHOSDigitizer");
391 AliPHOSGetter * gime = AliPHOSGetter::GetInstance() ;
398 treeD = fManager->GetTreeD() ;
399 nevents = 1 ; // Will process only one event
401 //Check, if this branch already exits
403 TObjArray * lob = (TObjArray*)treeD->GetListOfBranches() ;
405 TBranch * branch = 0 ;
406 Bool_t phosfound = kFALSE, digitizerfound = kFALSE ;
408 while ( (branch = (TBranch*)next()) && (!phosfound || !digitizerfound) ) {
409 if ( (strcmp(branch->GetName(), "PHOS")==0) &&
410 (strcmp(branch->GetTitle(), GetName())==0) )
413 else if ( (strcmp(branch->GetName(), "AliPHOSDigitizer")==0) &&
414 (strcmp(branch->GetTitle(), GetName())==0) )
415 digitizerfound = kTRUE ;
419 cerr << "WARNING: AliPHOSDigitizer -> Digits branch with name " << GetName()
420 << " already exits" << endl ;
423 if ( digitizerfound ) {
424 cerr << "WARNING: AliPHOSDigitizer -> Digitizer branch with name " << GetName()
425 << " already exits" << endl ;
430 else { //PHOS standalone
431 if(gime->BranchExists("Digits") )
433 nevents=gime->MaxEvent() ;
438 for(ievent = 0; ievent < nevents; ievent++){
443 for(input = 0 ; input < fManager->GetNinputs(); input ++){
444 TTree * treeS = fManager->GetInputTreeS(input) ;
446 cerr << "AliPHOSDigitizer::Exec -> No Input " << endl ;
449 gime->ReadTreeS(treeS,input) ;
454 gime->Event(ievent,"S") ;
456 Digitize(ievent) ; //Add prepared SDigits to digits and add the noise
458 WriteDigits(ievent) ;
460 if(strstr(option,"deb"))
463 //increment the total number of Digits per run
464 fDigitsInRun += gime->Digits()->GetEntriesFast() ;
467 if(strstr(option,"tim")){
468 gBenchmark->Stop("PHOSDigitizer");
469 cout << "AliPHOSDigitizer:" << endl ;
470 cout << " took " << gBenchmark->GetCpuTime("PHOSDigitizer") << " seconds for Digitizing "
471 << gBenchmark->GetCpuTime("PHOSDigitizer")/nevents << " seconds per event " << endl ;
477 //____________________________________________________________________________
478 Float_t AliPHOSDigitizer::FrontEdgeTime(TClonesArray * ticks)
480 ticks->Sort() ; //Sort in accordance with times of ticks
482 AliPHOSTick * ctick = (AliPHOSTick *) it.Next() ;
483 Float_t time = ctick->CrossingTime(fTimeThreshold) ;
486 while((t=(AliPHOSTick*) it.Next())){
487 if(t->GetTime() < time) //This tick starts before crossing
492 time = ctick->CrossingTime(fTimeThreshold) ;
497 //____________________________________________________________________________
498 Bool_t AliPHOSDigitizer::Init()
500 // Makes all memory allocations
502 if( strcmp(GetTitle(), "") == 0 )
503 SetTitle("galice.root") ;
505 AliPHOSGetter * gime = AliPHOSGetter::GetInstance(GetTitle(), GetName(), fToSplit) ;
507 cerr << "ERROR: AliPHOSDigitizer::Init -> Could not obtain the Getter object !" << endl ;
511 const AliPHOSGeometry * geom = gime->PHOSGeometry() ;
513 fEmcCrystals = geom->GetNModules() * geom->GetNCristalsInModule() ;
515 // Post Digits to the white board
516 gime->PostDigits(GetName() ) ;
518 // Post Digitizer to the white board
519 gime->PostDigitizer(this) ;
523 // construct the name of the file as /path/PHOS.SDigits.root
524 //First - extract full path if necessary
525 TString digitsFileName(GetTitle()) ;
526 Ssiz_t islash = digitsFileName.Last('/') ;
527 if(islash<digitsFileName.Length())
528 digitsFileName.Remove(islash+1,digitsFileName.Length()) ;
531 // Next - append the file name
532 digitsFileName+="PHOS.Digits." ;
533 if((strcmp(GetName(),"Default")!=0)&&(strcmp(GetName(),"")!=0)){
534 digitsFileName+=GetName() ;
535 digitsFileName+="." ;
537 digitsFileName+="root" ;
538 // Finally - check if the file already opened or open the file
539 fSplitFile = static_cast<TFile*>(gROOT->GetFile(digitsFileName.Data()));
541 fSplitFile = TFile::Open(digitsFileName.Data(),"update") ;
544 //Mark that we will use current header file
546 gime->PostSDigits(GetName(),GetTitle()) ;
547 gime->PostSDigitizer(GetName(),GetTitle()) ;
552 //____________________________________________________________________________
553 void AliPHOSDigitizer::InitParameters()
556 fEMCDigitThreshold = 0.012 ;
558 fCPVDigitThreshold = 0.09 ;
559 fTimeResolution = 0.5e-9 ;
560 fTimeSignalLength = 1.0e-9 ;
562 fADCchanelEmc = 0.0015; // width of one ADC channel in GeV
563 fADCpedestalEmc = 0.005 ; //
564 fNADCemc = (Int_t) TMath::Power(2,16) ; // number of channels in EMC ADC
566 fADCchanelCpv = 0.0012 ; // width of one ADC channel in CPV 'popugais'
567 fADCpedestalCpv = 0.012 ; //
568 fNADCcpv = (Int_t) TMath::Power(2,12); // number of channels in CPV ADC
570 fTimeThreshold = 0.001*10000000 ; //Means 1 MeV in terms of SDigits amplitude
574 //__________________________________________________________________
575 void AliPHOSDigitizer::MixWith(const char* headerFile)
577 // Allows to produce digits by superimposing background and signal event.
578 // It is assumed, that headers file with SIGNAL events is opened in
580 // Sets the BACKGROUND event, with which the SIGNAL event is to be mixed
581 // Thus we avoid writing (changing) huge and expensive
582 // backgound files: all output will be writen into SIGNAL, i.e.
583 // opened in constructor file.
585 // One can open as many files to mix with as one needs.
586 // However only Sdigits with the same name (i.e. constructed with the same SDigitizer)
589 if( strcmp(GetName(), "") == 0 )
593 cout << "Can not use this method under AliRunDigitizer " << endl ;
597 // check if the specified SDigits do not already exist on the White Board:
598 // //Folders/RunMC/Event/Data/PHOS/SDigits/headerFile/sdigitsname
600 AliPHOSGetter * gime = AliPHOSGetter::GetInstance() ;
601 TString path = gime->SDigitsFolder()->GetName() ;
603 // before it was ???? "Folders/RunMC/Event/Data/PHOS/SDigits" ;
607 if ( gROOT->FindObjectAny(path.Data()) ) {
608 cerr << "WARNING: AliPHOSDigitizer::MixWith -> Entry already exists, do not add" << endl ;
612 gime->PostSDigits(GetName(),headerFile) ;
614 // check if the requested file is already open or exist and if SDigits Branch exist
615 TFile * file = (TFile*)gROOT->FindObject(headerFile);
617 file = new TFile(headerFile, "READ") ;
619 cerr << "ERROR: AliPHOSDigitizer::MixWith -> File " << headerFile << " does not exist!" << endl ;
626 //__________________________________________________________________
627 void AliPHOSDigitizer::Print(Option_t* option)const {
628 // Print Digitizer's parameters
629 if( strcmp(GetName(), "") != 0 ){
632 cout << "------------------- "<< GetName() << " -------------" << endl ;
634 const Int_t nStreams = GetNInputStreams() ;
637 for (index = 0 ; index < nStreams ; index++)
638 cout << "Adding SDigits " << GetName() << " from " << fManager->GetInputFileName(index, 0) << endl ;
641 cout << "Writing digits to " << fManager->GetInputFileName(0, 0) << endl ;
643 // AliPHOSGetter * gime = AliPHOSGetter::GetInstance() ;
644 // gime->Folder("sdigits") ;
645 // cout << "Digitizing sDigits from file(s): " <<endl ;
646 // TCollection * folderslist = gime->Folder("sdigits")->GetListOfFolders() ;
647 // TIter next(folderslist) ;
648 // TFolder * folder = 0 ;
650 // while ( (folder = (TFolder*)next()) ) {
651 // if ( folder->FindObject(GetName()) )
652 // cout << "Adding SDigits " << GetName() << " from " << GetSDigitsFileName() << endl ;
655 cout << "Writing digits to " << GetTitle() << endl ;
658 cout << "With following parameters: " << endl ;
659 cout << " Electronics noise in EMC (fPinNoise) = " << fPinNoise << endl ;
660 cout << " Threshold in EMC (fEMCDigitThreshold) = " << fEMCDigitThreshold << endl ; ;
661 cout << " Noise in CPV (fCPVNoise) = " << fCPVNoise << endl ;
662 cout << " Threshold in CPV (fCPVDigitThreshold) = " << fCPVDigitThreshold << endl ;
663 cout << "---------------------------------------------------" << endl ;
666 cout << "AliPHOSDigitizer not initialized " << endl ;
670 //__________________________________________________________________
671 void AliPHOSDigitizer::PrintDigits(Option_t * option){
672 // Print a table of digits
674 AliPHOSGetter * gime = AliPHOSGetter::GetInstance() ;
675 TClonesArray * digits = gime->Digits() ;
677 cout << "AliPHOSDigitiser: event " << gAlice->GetEvNumber() << endl ;
678 cout << " Number of entries in Digits list " << digits->GetEntriesFast() << endl ;
680 if(strstr(option,"all")||strstr(option,"EMC")){
683 AliPHOSDigit * digit;
684 cout << "EMC digits (with primaries): " << endl ;
685 cout << "Digit Id Amplitude Index Nprim Primaries list " << endl;
686 Int_t maxEmc = gime->PHOSGeometry()->GetNModules()*gime->PHOSGeometry()->GetNCristalsInModule() ;
688 for (index = 0 ; (index < digits->GetEntriesFast()) &&
689 (((AliPHOSDigit * ) digits->At(index))->GetId() <= maxEmc) ; index++) {
690 digit = (AliPHOSDigit * ) digits->At(index) ;
691 if(digit->GetNprimary() == 0) continue;
692 cout << setw(6) << digit->GetId() << " " << setw(10) << digit->GetAmp() << " "
693 << setw(6) << digit->GetIndexInList() << " "
694 << setw(5) << digit->GetNprimary() <<" ";
697 for (iprimary=0; iprimary<digit->GetNprimary(); iprimary++)
698 cout << setw(5) << digit->GetPrimary(iprimary+1) << " ";
704 if(strstr(option,"all")||strstr(option,"CPV")){
706 //loop over CPV digits
707 AliPHOSDigit * digit;
708 cout << "CPV digits: " << endl ;
709 cout << "Digit Id Amplitude Index Nprim Primaries list " << endl;
710 Int_t maxEmc = gime->PHOSGeometry()->GetNModules()*gime->PHOSGeometry()->GetNCristalsInModule() ;
712 for (index = 0 ; index < digits->GetEntriesFast(); index++) {
713 digit = (AliPHOSDigit * ) digits->At(index) ;
714 if(digit->GetId() > maxEmc){
715 cout << setw(6) << digit->GetId() << " " << setw(10) << digit->GetAmp() << " "
716 << setw(6) << digit->GetIndexInList() << " "
717 << setw(5) << digit->GetNprimary() <<" ";
720 for (iprimary=0; iprimary<digit->GetNprimary(); iprimary++)
721 cout << setw(5) << digit->GetPrimary(iprimary+1) << " ";
729 //__________________________________________________________________
730 Float_t AliPHOSDigitizer::TimeOfNoise(void)
731 { // Calculates the time signal generated by noise
732 //to be rewritten, now returns just big number
737 //____________________________________________________________________________
738 void AliPHOSDigitizer::WriteDigits(Int_t event)
741 // Makes TreeD in the output file.
742 // Check if branch already exists:
743 // if yes, exit without writing: ROOT TTree does not support overwriting/updating of
744 // already existing branches.
745 // else creates branch with Digits, named "PHOS", title "...",
746 // and branch "AliPHOSDigitizer", with the same title to keep all the parameters
747 // and names of files, from which digits are made.
749 AliPHOSGetter * gime = AliPHOSGetter::GetInstance() ;
750 const TClonesArray * digits = gime->Digits(GetName()) ;
754 treeD = fManager->GetTreeD() ;
756 if((gAlice->TreeD() == 0) || (fSplitFile)) // we should not create TreeD if it is already here
757 gAlice->MakeTree("D", fSplitFile); // We overwrite TreeD in split file in the case of second reconstruction
760 treeD = gAlice->TreeD();
763 // -- create Digits branch
764 Int_t bufferSize = 32000 ;
765 TBranch * digitsBranch = treeD->Branch("PHOS",&digits,bufferSize);
766 digitsBranch->SetTitle(GetName());
768 // -- Create Digitizer branch
769 Int_t splitlevel = 0 ;
770 const AliPHOSDigitizer * d = gime->Digitizer(GetName()) ;
771 TBranch * digitizerBranch = treeD->Branch("AliPHOSDigitizer", "AliPHOSDigitizer", &d,bufferSize,splitlevel);
772 digitizerBranch->SetTitle(GetName());
774 digitsBranch->Fill() ;
775 digitizerBranch->Fill() ;