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()
67 AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp)
70 // Add a generator to the list
71 // First check that list exists
72 if (!fEntries) fEntries = new TList();
75 // Forward parameters to the new generator
76 if(TestBit(kPtRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
77 Generator->SetPtRange(fPtMin,fPtMax);
78 if(TestBit(kMomentumRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
79 Generator->SetMomentumRange(fPMin,fPMax);
81 if (!(Generator->TestBit(kYRange)))
82 Generator->SetYRange(fYMin,fYMax);
83 if (!(Generator->TestBit(kPhiRange)))
84 Generator->SetPhiRange(fPhiMin*180/TMath::Pi(),fPhiMax*180/TMath::Pi());
85 if (!(Generator->TestBit(kThetaRange)))
86 Generator->SetThetaRange(fThetaMin*180/TMath::Pi(),fThetaMax*180/TMath::Pi());
87 if (!(Generator->TestBit(kVertexRange)))
88 Generator->SetOrigin(fOrigin[0], fOrigin[1], fOrigin[2]);
90 Generator->SetSigma(fOsigma[0], fOsigma[1], fOsigma[2]);
91 Generator->SetVertexSmear(fVertexSmear);
92 Generator->SetVertexSource(kContainer);
93 Generator->SetTrackingFlag(fTrackIt);
94 Generator->SetContainer(this);
98 // Add generator to list
100 sprintf(theName, "%s_%d",Name, fNGenerators);
101 Generator->SetName(theName);
103 AliGenCocktailEntry *entry =
104 new AliGenCocktailEntry(Generator, Name, RateExp);
106 fEntries->Add(entry);
110 void AliGenCocktail::Init()
113 TIter next(fEntries);
114 AliGenCocktailEntry *entry;
116 // Loop over generators and initialize
117 while((entry = (AliGenCocktailEntry*)next())) {
118 if (fStack) entry->Generator()->SetStack(fStack);
119 entry->Generator()->Init();
125 fProb.Set(fNGenerators);
128 while((entry = (AliGenCocktailEntry*)next())) {
129 sum += entry->Rate();
135 while((entry = (AliGenCocktailEntry*)next())) {
136 psum += entry->Rate() / sum;
143 void AliGenCocktail::FinishRun()
146 TIter next(fEntries);
147 AliGenCocktailEntry *entry;
149 // Loop over generators and initialize
150 while((entry = (AliGenCocktailEntry*)next())) {
151 entry->Generator()->FinishRun();
155 void AliGenCocktail::Generate()
159 TIter next(fEntries);
160 AliGenCocktailEntry *entry = 0;
161 AliGenCocktailEntry *preventry = 0;
162 AliGenerator* gen = 0;
163 if (fHeader) delete fHeader;
164 fHeader = new AliGenCocktailEventHeader("Cocktail Header");
166 TObjArray *partArray = gAlice->GetMCApp()->Particles();
169 // Generate the vertex position used by all generators
171 if(fVertexSmear == kPerEvent) Vertex();
175 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
179 // Loop over generators and generate events
182 while((entry = (AliGenCocktailEntry*)next())) {
187 entry->SetFirst((partArray->GetEntriesFast())+1);
190 // Handle case in which current generator needs collision geometry from previous generator
192 gen = entry->Generator();
193 if (gen->NeedsCollisionGeometry())
195 if (preventry && preventry->Generator()->ProvidesCollisionGeometry())
197 gen->SetCollisionGeometry(preventry->Generator()->CollisionGeometry());
199 Fatal("Generate()", "No Collision Geometry Provided");
202 entry->Generator()->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
203 entry->Generator()->Generate();
204 entry->SetLast(partArray->GetEntriesFast());
209 // Select a generator randomly
212 Float_t p0 = gRandom->Rndm();
214 for (i = 0; i < fNGenerators; i++) {
215 if (p0 < fProb[i]) break;
218 entry = (AliGenCocktailEntry*) fEntries->At(i);
220 gen = entry->Generator();
221 entry->Generator()->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
222 entry->Generator()->Generate();
223 entry->SetLast(partArray->GetEntriesFast());
230 fHeader->SetPrimaryVertex(eventVertex);
231 gAlice->SetGenEventHeader(fHeader);
234 void AliGenCocktail::SetVertexSmear(VertexSmear_t smear)
236 // Set vertex smearing and propagate it to the generators
238 AliGenerator::SetVertexSmear(smear);
239 TIter next(fEntries);
240 while (AliGenCocktailEntry* entry = (AliGenCocktailEntry*)next()) {
241 entry->Generator()->SetVertexSmear(smear);
245 AliGenCocktailEntry * AliGenCocktail::FirstGenerator()
247 // Iterator over generators: Initialisation
248 flnk1 = fEntries->FirstLink();
250 return (AliGenCocktailEntry*) (flnk1->GetObject());
256 AliGenCocktailEntry* AliGenCocktail::NextGenerator()
258 // Iterator over generators: Increment
259 flnk1 = flnk1->Next();
261 return (AliGenCocktailEntry*) (flnk1->GetObject());
267 void AliGenCocktail::
268 FirstGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
270 // Iterator over generator pairs: Initialisation
271 flnk2 = flnk1 = fEntries->FirstLink();
273 e2 = e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
279 void AliGenCocktail::
280 NextGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
282 // Iterator over generators: Increment
283 flnk2 = flnk2->Next();
285 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
286 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
288 flnk2 = flnk1 = flnk1->Next();
290 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
291 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
299 void AliGenCocktail::AddHeader(AliGenEventHeader* header)
301 // Add a header to the list
302 if (fHeader) fHeader->AddHeader(header);
305 AliGenCocktail& AliGenCocktail::operator=(const AliGenCocktail& rhs)
307 // Assignment operator
312 void AliGenCocktail::Copy(TObject &) const
314 Fatal("Copy","Not implemented!\n");