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()
43 fTitle= "Particle Generator using cocktail of generators";
52 AliGenCocktail::AliGenCocktail(const AliGenCocktail & cocktail):
53 AliGenerator(cocktail)
59 AliGenCocktail::~AliGenCocktail()
64 // delete fHeader; // It is removed in AliRunLoader
69 AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp)
72 // Add a generator to the list
73 // First check that list exists
74 if (!fEntries) fEntries = new TList();
77 // Forward parameters to the new generator
78 if(TestBit(kPtRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
79 Generator->SetPtRange(fPtMin,fPtMax);
80 if(TestBit(kMomentumRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
81 Generator->SetMomentumRange(fPMin,fPMax);
83 if (!(Generator->TestBit(kYRange)))
84 Generator->SetYRange(fYMin,fYMax);
85 if (!(Generator->TestBit(kPhiRange)))
86 Generator->SetPhiRange(fPhiMin*180/TMath::Pi(),fPhiMax*180/TMath::Pi());
87 if (!(Generator->TestBit(kThetaRange)))
88 Generator->SetThetaRange(fThetaMin*180/TMath::Pi(),fThetaMax*180/TMath::Pi());
89 if (!(Generator->TestBit(kVertexRange)))
90 Generator->SetOrigin(fOrigin[0], fOrigin[1], fOrigin[2]);
92 Generator->SetSigma(fOsigma[0], fOsigma[1], fOsigma[2]);
93 Generator->SetVertexSmear(fVertexSmear);
94 Generator->SetVertexSource(kContainer);
95 Generator->SetTrackingFlag(fTrackIt);
96 Generator->SetContainer(this);
100 // Add generator to list
102 sprintf(theName, "%s_%d",Name, fNGenerators);
103 Generator->SetName(theName);
105 AliGenCocktailEntry *entry =
106 new AliGenCocktailEntry(Generator, Name, RateExp);
108 fEntries->Add(entry);
116 void AliGenCocktail::Init()
119 TIter next(fEntries);
120 AliGenCocktailEntry *entry;
122 // Loop over generators and initialize
123 while((entry = (AliGenCocktailEntry*)next())) {
124 if (fStack) entry->Generator()->SetStack(fStack);
125 entry->Generator()->Init();
131 fProb.Set(fNGenerators);
134 while((entry = (AliGenCocktailEntry*)next())) {
135 sum += entry->Rate();
141 while((entry = (AliGenCocktailEntry*)next())) {
142 psum += entry->Rate() / sum;
149 void AliGenCocktail::FinishRun()
152 TIter next(fEntries);
153 AliGenCocktailEntry *entry;
155 // Loop over generators and initialize
156 while((entry = (AliGenCocktailEntry*)next())) {
157 entry->Generator()->FinishRun();
161 void AliGenCocktail::Generate()
165 TIter next(fEntries);
166 AliGenCocktailEntry *entry = 0;
167 AliGenCocktailEntry *preventry = 0;
168 AliGenerator* gen = 0;
169 if (fHeader) delete fHeader;
170 fHeader = new AliGenCocktailEventHeader("Cocktail Header");
172 TObjArray *partArray = gAlice->GetMCApp()->Particles();
175 // Generate the vertex position used by all generators
177 if(fVertexSmear == kPerEvent) Vertex();
181 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
185 // Loop over generators and generate events
188 while((entry = (AliGenCocktailEntry*)next())) {
193 entry->SetFirst((partArray->GetEntriesFast())+1);
196 // Handle case in which current generator needs collision geometry from previous generator
198 gen = entry->Generator();
199 if (gen->NeedsCollisionGeometry())
201 if (preventry && preventry->Generator()->ProvidesCollisionGeometry())
203 gen->SetCollisionGeometry(preventry->Generator()->CollisionGeometry());
205 Fatal("Generate()", "No Collision Geometry Provided");
208 entry->Generator()->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
209 entry->Generator()->Generate();
210 entry->SetLast(partArray->GetEntriesFast());
215 // Select a generator randomly
218 Float_t p0 = gRandom->Rndm();
220 for (i = 0; i < fNGenerators; i++) {
221 if (p0 < fProb[i]) break;
224 entry = (AliGenCocktailEntry*) fEntries->At(i);
226 gen = entry->Generator();
227 entry->Generator()->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
228 entry->Generator()->Generate();
229 entry->SetLast(partArray->GetEntriesFast());
236 fHeader->SetPrimaryVertex(eventVertex);
237 gAlice->SetGenEventHeader(fHeader);
240 void AliGenCocktail::SetVertexSmear(VertexSmear_t smear)
242 // Set vertex smearing and propagate it to the generators
244 AliGenerator::SetVertexSmear(smear);
245 TIter next(fEntries);
246 while (AliGenCocktailEntry* entry = (AliGenCocktailEntry*)next()) {
247 entry->Generator()->SetVertexSmear(smear);
251 AliGenCocktailEntry * AliGenCocktail::FirstGenerator()
253 // Iterator over generators: Initialisation
254 flnk1 = fEntries->FirstLink();
256 return (AliGenCocktailEntry*) (flnk1->GetObject());
262 AliGenCocktailEntry* AliGenCocktail::NextGenerator()
264 // Iterator over generators: Increment
265 flnk1 = flnk1->Next();
267 return (AliGenCocktailEntry*) (flnk1->GetObject());
273 void AliGenCocktail::
274 FirstGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
276 // Iterator over generator pairs: Initialisation
277 flnk2 = flnk1 = fEntries->FirstLink();
279 e2 = e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
285 void AliGenCocktail::
286 NextGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
288 // Iterator over generators: Increment
289 flnk2 = flnk2->Next();
291 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
292 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
294 flnk2 = flnk1 = flnk1->Next();
296 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
297 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
305 void AliGenCocktail::AddHeader(AliGenEventHeader* header)
307 // Add a header to the list
308 if (fHeader) fHeader->AddHeader(header);
311 AliGenCocktail& AliGenCocktail::operator=(const AliGenCocktail& rhs)
313 // Assignment operator
318 void AliGenCocktail::Copy(TObject &) const
320 Fatal("Copy","Not implemented!\n");