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 // Container class for AliGenerator through recursion.
19 // Container is itself an AliGenerator.
20 // What is stored are not the pointers to the generators directly but to objects of type
21 // AliGenCocktail entry.
22 // The class provides also iterator functionality.
23 // Author: andreas.morsch@cern.ch
27 #include <TObjArray.h>
29 #include "AliGenCocktail.h"
30 #include "AliGenCocktailEntry.h"
31 #include "AliCollisionGeometry.h"
34 #include "AliGenCocktailEventHeader.h"
36 ClassImp(AliGenCocktail)
38 AliGenCocktail::AliGenCocktail()
42 fUsePerEventRate(kFALSE),
51 fTitle= "Particle Generator using cocktail of generators";
54 AliGenCocktail::~AliGenCocktail()
59 // delete fHeader; // It is removed in AliRunLoader
64 AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp)
67 // Add a generator to the list
68 // First check that list exists
69 if (!fEntries) fEntries = new TList();
72 // Forward parameters to the new generator
73 if(TestBit(kPtRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
74 Generator->SetPtRange(fPtMin,fPtMax);
75 if(TestBit(kMomentumRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
76 Generator->SetMomentumRange(fPMin,fPMax);
78 if (!(Generator->TestBit(kYRange)))
79 Generator->SetYRange(fYMin,fYMax);
80 if (!(Generator->TestBit(kPhiRange)))
81 Generator->SetPhiRange(fPhiMin*180/TMath::Pi(),fPhiMax*180/TMath::Pi());
82 if (!(Generator->TestBit(kThetaRange)))
83 Generator->SetThetaRange(fThetaMin*180/TMath::Pi(),fThetaMax*180/TMath::Pi());
84 if (!(Generator->TestBit(kVertexRange))) {
85 Generator->SetOrigin(fOrigin[0], fOrigin[1], fOrigin[2]);
86 Generator->SetSigma(fOsigma[0], fOsigma[1], fOsigma[2]);
87 Generator->SetVertexSmear(fVertexSmear);
88 Generator->SetVertexSource(kContainer);
90 Generator->SetTrackingFlag(fTrackIt);
91 Generator->SetContainer(this);
95 // Add generator to list
97 sprintf(theName, "%s_%d",Name, fNGenerators);
98 Generator->SetName(theName);
100 AliGenCocktailEntry *entry =
101 new AliGenCocktailEntry(Generator, Name, RateExp);
103 fEntries->Add(entry);
111 void AliGenCocktail::Init()
114 TIter next(fEntries);
115 AliGenCocktailEntry *entry;
117 // Loop over generators and initialize
118 while((entry = (AliGenCocktailEntry*)next())) {
119 if (fStack) entry->Generator()->SetStack(fStack);
120 entry->Generator()->Init();
126 fProb.Set(fNGenerators);
129 while((entry = (AliGenCocktailEntry*)next())) {
130 sum += entry->Rate();
136 while((entry = (AliGenCocktailEntry*)next())) {
137 psum += entry->Rate() / sum;
144 void AliGenCocktail::FinishRun()
147 TIter next(fEntries);
148 AliGenCocktailEntry *entry;
150 // Loop over generators and initialize
151 while((entry = (AliGenCocktailEntry*)next())) {
152 entry->Generator()->FinishRun();
156 void AliGenCocktail::Generate()
160 TIter next(fEntries);
161 AliGenCocktailEntry *entry = 0;
162 AliGenCocktailEntry *preventry = 0;
163 AliGenerator* gen = 0;
164 if (fHeader) delete fHeader;
167 fHeader = new AliGenCocktailEventHeader("Cocktail Header");
169 TObjArray *partArray = gAlice->GetMCApp()->Particles();
172 // Generate the vertex position used by all generators
174 if(fVertexSmear == kPerEvent) Vertex();
178 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
182 // Loop over generators and generate events
184 while((entry = (AliGenCocktailEntry*)next())) {
185 if (fUsePerEventRate && (gRandom->Rndm() > entry->Rate())) continue;
191 entry->SetFirst((partArray->GetEntriesFast())+1);
194 // Handle case in which current generator needs collision geometry from previous generator
196 gen = entry->Generator();
197 if (gen->NeedsCollisionGeometry())
199 if (preventry && preventry->Generator()->ProvidesCollisionGeometry())
201 gen->SetCollisionGeometry(preventry->Generator()->CollisionGeometry());
203 Fatal("Generate()", "No Collision Geometry Provided");
206 entry->Generator()->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
207 entry->Generator()->Generate();
208 entry->SetLast(partArray->GetEntriesFast());
211 } else if (fRandom) {
213 // Select a generator randomly
216 Float_t p0 = gRandom->Rndm();
218 for (i = 0; i < fNGenerators; i++) {
219 if (p0 < fProb[i]) break;
222 entry = (AliGenCocktailEntry*) fEntries->At(i);
224 gen = entry->Generator();
225 entry->Generator()->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
226 entry->Generator()->Generate();
227 entry->SetLast(partArray->GetEntriesFast());
233 fHeader->SetPrimaryVertex(eventVertex);
234 fHeader->CalcNProduced();
235 gAlice->SetGenEventHeader(fHeader);
238 void AliGenCocktail::SetVertexSmear(VertexSmear_t smear)
240 // Set vertex smearing and propagate it to the generators
242 AliGenerator::SetVertexSmear(smear);
243 TIter next(fEntries);
244 while (AliGenCocktailEntry* entry = (AliGenCocktailEntry*)next()) {
245 entry->Generator()->SetVertexSmear(smear);
249 AliGenCocktailEntry * AliGenCocktail::FirstGenerator()
251 // Iterator over generators: Initialisation
252 flnk1 = fEntries->FirstLink();
254 return (AliGenCocktailEntry*) (flnk1->GetObject());
260 AliGenCocktailEntry* AliGenCocktail::NextGenerator()
262 // Iterator over generators: Increment
263 flnk1 = flnk1->Next();
265 return (AliGenCocktailEntry*) (flnk1->GetObject());
271 void AliGenCocktail::
272 FirstGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
274 // Iterator over generator pairs: Initialisation
275 flnk2 = flnk1 = fEntries->FirstLink();
277 e2 = e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
283 void AliGenCocktail::
284 NextGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
286 // Iterator over generators: Increment
287 flnk2 = flnk2->Next();
289 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
290 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
292 flnk2 = flnk1 = flnk1->Next();
294 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
295 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
303 void AliGenCocktail::AddHeader(AliGenEventHeader* header)
305 // Add a header to the list
306 if (fHeader) fHeader->AddHeader(header);