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 "AliGenEventHeader.h"
36 ClassImp(AliGenCocktail)
38 AliGenCocktail::AliGenCocktail()
43 fTitle= "Particle Generator using cocktail of generators";
51 AliGenCocktail::AliGenCocktail(const AliGenCocktail & cocktail):
52 AliGenerator(cocktail)
58 AliGenCocktail::~AliGenCocktail()
65 AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp)
68 // Add a generator to the list
69 // First check that list exists
70 if (!fEntries) fEntries = new TList();
73 // Forward parameters to the new generator
74 if(TestBit(kPtRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
75 Generator->SetPtRange(fPtMin,fPtMax);
76 if(TestBit(kMomentumRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
77 Generator->SetMomentumRange(fPMin,fPMax);
79 if (!(Generator->TestBit(kYRange)))
80 Generator->SetYRange(fYMin,fYMax);
81 if (!(Generator->TestBit(kPhiRange)))
82 Generator->SetPhiRange(fPhiMin*180/TMath::Pi(),fPhiMax*180/TMath::Pi());
83 if (!(Generator->TestBit(kThetaRange)))
84 Generator->SetThetaRange(fThetaMin*180/TMath::Pi(),fThetaMax*180/TMath::Pi());
85 if (!(Generator->TestBit(kVertexRange)))
86 Generator->SetOrigin(fOrigin[0], fOrigin[1], fOrigin[2]);
88 Generator->SetSigma(fOsigma[0], fOsigma[1], fOsigma[2]);
89 Generator->SetVertexSmear(fVertexSmear);
90 Generator->SetVertexSource(kContainer);
91 Generator->SetTrackingFlag(fTrackIt);
94 // Add generator to list
96 sprintf(theName, "%s_%d",Name, fNGenerators);
97 Generator->SetName(theName);
99 AliGenCocktailEntry *entry =
100 new AliGenCocktailEntry(Generator, Name, RateExp);
102 fEntries->Add(entry);
106 void AliGenCocktail::Init()
109 TIter next(fEntries);
110 AliGenCocktailEntry *entry;
112 // Loop over generators and initialize
113 while((entry = (AliGenCocktailEntry*)next())) {
114 if (fStack) entry->Generator()->SetStack(fStack);
115 entry->Generator()->Init();
121 fProb.Set(fNGenerators);
124 while((entry = (AliGenCocktailEntry*)next())) {
125 sum += entry->Rate();
131 while((entry = (AliGenCocktailEntry*)next())) {
132 psum += entry->Rate() / sum;
139 void AliGenCocktail::FinishRun()
142 TIter next(fEntries);
143 AliGenCocktailEntry *entry;
145 // Loop over generators and initialize
146 while((entry = (AliGenCocktailEntry*)next())) {
147 entry->Generator()->FinishRun();
151 void AliGenCocktail::Generate()
155 TIter next(fEntries);
156 AliGenCocktailEntry *entry = 0;
157 AliGenCocktailEntry *preventry = 0;
158 AliGenerator* gen = 0;
160 TObjArray *partArray = gAlice->GetMCApp()->Particles();
163 // Generate the vertex position used by all generators
165 if(fVertexSmear == kPerEvent) Vertex();
169 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
173 // Loop over generators and generate events
176 while((entry = (AliGenCocktailEntry*)next())) {
181 entry->SetFirst((partArray->GetEntriesFast())+1);
184 // Handle case in which current generator needs collision geometry from previous generator
186 gen = entry->Generator();
187 if (gen->NeedsCollisionGeometry())
189 if (preventry && preventry->Generator()->ProvidesCollisionGeometry())
191 gen->SetCollisionGeometry(preventry->Generator()->CollisionGeometry());
193 Fatal("Generate()", "No Collision Geometry Provided");
196 entry->Generator()->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
197 entry->Generator()->Generate();
198 entry->SetLast(partArray->GetEntriesFast());
203 // Select a generator randomly
206 Float_t p0 = gRandom->Rndm();
208 for (i = 0; i < fNGenerators; i++) {
209 if (p0 < fProb[i]) break;
212 entry = (AliGenCocktailEntry*) fEntries->At(i);
214 gen = entry->Generator();
215 entry->Generator()->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
216 entry->Generator()->Generate();
217 entry->SetLast(partArray->GetEntriesFast());
223 AliGenEventHeader* header = new AliGenEventHeader("AliGenCocktail");
225 header->SetPrimaryVertex(eventVertex);
226 gAlice->SetGenEventHeader(header);
229 void AliGenCocktail::SetVertexSmear(VertexSmear_t smear)
231 // Set vertex smearing and propagate it to the generators
233 AliGenerator::SetVertexSmear(smear);
234 TIter next(fEntries);
235 while (AliGenCocktailEntry* entry = (AliGenCocktailEntry*)next()) {
236 entry->Generator()->SetVertexSmear(smear);
240 AliGenCocktailEntry * AliGenCocktail::FirstGenerator()
242 // Iterator over generators: Initialisation
243 flnk1 = fEntries->FirstLink();
245 return (AliGenCocktailEntry*) (flnk1->GetObject());
251 AliGenCocktailEntry* AliGenCocktail::NextGenerator()
253 // Iterator over generators: Increment
254 flnk1 = flnk1->Next();
256 return (AliGenCocktailEntry*) (flnk1->GetObject());
262 void AliGenCocktail::
263 FirstGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
265 // Iterator over generator pairs: Initialisation
266 flnk2 = flnk1 = fEntries->FirstLink();
268 e2 = e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
274 void AliGenCocktail::
275 NextGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
277 // Iterator over generators: Increment
278 flnk2 = flnk2->Next();
280 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
281 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
283 flnk2 = flnk1 = flnk1->Next();
285 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
286 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
294 AliGenCocktail& AliGenCocktail::operator=(const AliGenCocktail& rhs)
296 // Assignment operator
301 void AliGenCocktail::Copy(TObject &) const
303 Fatal("Copy","Not implemented!\n");