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[u/mrichter/AliRoot.git] / EVGEN / AliGenCocktail.cxx
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4c039060 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
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 **************************************************************************/
15
88cb7938 16/* $Id$ */
4c039060 17
675e9664 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
24//
25
116cbefd 26#include <TList.h>
27#include <TObjArray.h>
28
fe4da5cc 29#include "AliGenCocktail.h"
374924b5 30#include "AliGenCocktailEntry.h"
09e2e187 31#include "AliCollisionGeometry.h"
fe4da5cc 32#include "AliRun.h"
5d12ce38 33#include "AliMC.h"
4f85aa78 34#include "AliGenCocktailEventHeader.h"
fe4da5cc 35
36ClassImp(AliGenCocktail)
37
38AliGenCocktail::AliGenCocktail()
1c56e311 39 :AliGenerator(),
40 fNGenerators(0),
8058ead1 41 fTotalRate(0.),
1c56e311 42 fRandom(kFALSE),
43 fUsePerEventRate(kFALSE),
44 fProb(0),
45 fEntries(0),
46 flnk1(0),
47 flnk2(0),
48 fHeader(0)
fe4da5cc 49{
374924b5 50// Constructor
8b31bfac 51 fName = "Cocktail";
52 fTitle= "Particle Generator using cocktail of generators";
fe4da5cc 53}
54
fe4da5cc 55AliGenCocktail::~AliGenCocktail()
56{
374924b5 57// Destructor
fe4da5cc 58 delete fEntries;
373c1a55 59 fEntries = 0;
60 // delete fHeader; // It is removed in AliRunLoader
61 fHeader = 0;
fe4da5cc 62}
63
64void AliGenCocktail::
a764b7de 65AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp)
fe4da5cc 66{
67//
b1403e15 68// Add a generator to the list
69// First check that list exists
70 if (!fEntries) fEntries = new TList();
8058ead1 71 fTotalRate += RateExp;
b1403e15 72//
fe4da5cc 73// Forward parameters to the new generator
212bcf04 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);
78
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());
4a6ca8fc 85 if (!(Generator->TestBit(kVertexRange))) {
212bcf04 86 Generator->SetOrigin(fOrigin[0], fOrigin[1], fOrigin[2]);
4a6ca8fc 87 Generator->SetSigma(fOsigma[0], fOsigma[1], fOsigma[2]);
88 Generator->SetVertexSmear(fVertexSmear);
89 Generator->SetVertexSource(kContainer);
90 }
c8f7f6f9 91 Generator->SetTrackingFlag(fTrackIt);
4f85aa78 92 Generator->SetContainer(this);
93
c97002cc 94
fe4da5cc 95//
96// Add generator to list
c5c3e4b0 97 char theName[256];
98 sprintf(theName, "%s_%d",Name, fNGenerators);
99 Generator->SetName(theName);
100
374924b5 101 AliGenCocktailEntry *entry =
fe4da5cc 102 new AliGenCocktailEntry(Generator, Name, RateExp);
c5c3e4b0 103
374924b5 104 fEntries->Add(entry);
fe4da5cc 105 fNGenerators++;
373c1a55 106 flnk1 = 0;
107 flnk2 = 0;
108 fRandom = kFALSE;
109 fHeader = 0;
110}
fe4da5cc 111
112 void AliGenCocktail::Init()
374924b5 113{
114// Initialisation
115 TIter next(fEntries);
116 AliGenCocktailEntry *entry;
117 //
118 // Loop over generators and initialize
119 while((entry = (AliGenCocktailEntry*)next())) {
c97002cc 120 if (fStack) entry->Generator()->SetStack(fStack);
374924b5 121 entry->Generator()->Init();
122 }
1ebe6dc8 123
124 next.Reset();
125
126 if (fRandom) {
127 fProb.Set(fNGenerators);
128 next.Reset();
129 Float_t sum = 0.;
130 while((entry = (AliGenCocktailEntry*)next())) {
131 sum += entry->Rate();
132 }
133
134 next.Reset();
135 Int_t i = 0;
136 Float_t psum = 0.;
137 while((entry = (AliGenCocktailEntry*)next())) {
138 psum += entry->Rate() / sum;
139 fProb[i++] = psum;
140 }
141 }
142 next.Reset();
374924b5 143}
fe4da5cc 144
09e2e187 145 void AliGenCocktail::FinishRun()
146{
147// Initialisation
148 TIter next(fEntries);
149 AliGenCocktailEntry *entry;
150 //
151 // Loop over generators and initialize
152 while((entry = (AliGenCocktailEntry*)next())) {
153 entry->Generator()->FinishRun();
154 }
155}
156
fe4da5cc 157 void AliGenCocktail::Generate()
374924b5 158{
159//
160// Generate event
161 TIter next(fEntries);
a8408367 162 AliGenCocktailEntry *entry = 0;
163 AliGenCocktailEntry *preventry = 0;
164 AliGenerator* gen = 0;
4f85aa78 165 if (fHeader) delete fHeader;
c89fc3f1 166
167
4f85aa78 168 fHeader = new AliGenCocktailEventHeader("Cocktail Header");
09e2e187 169
d94af0c1 170 const TObjArray *partArray = gAlice->GetMCApp()->Particles();
c8f7f6f9 171
172//
173// Generate the vertex position used by all generators
174//
175 if(fVertexSmear == kPerEvent) Vertex();
176
67db3ff2 177 TArrayF eventVertex;
178 eventVertex.Set(3);
179 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
180
1ebe6dc8 181 if (!fRandom) {
182 //
183 // Loop over generators and generate events
184 Int_t igen=0;
1ebe6dc8 185 while((entry = (AliGenCocktailEntry*)next())) {
c89fc3f1 186 if (fUsePerEventRate && (gRandom->Rndm() > entry->Rate())) continue;
187
1ebe6dc8 188 igen++;
189 if (igen ==1) {
190 entry->SetFirst(0);
191 } else {
192 entry->SetFirst((partArray->GetEntriesFast())+1);
193 }
a8408367 194//
195// Handle case in which current generator needs collision geometry from previous generator
196//
1ebe6dc8 197 gen = entry->Generator();
198 if (gen->NeedsCollisionGeometry())
a8408367 199 {
1ebe6dc8 200 if (preventry && preventry->Generator()->ProvidesCollisionGeometry())
201 {
202 gen->SetCollisionGeometry(preventry->Generator()->CollisionGeometry());
203 } else {
204 Fatal("Generate()", "No Collision Geometry Provided");
205 }
a8408367 206 }
1ebe6dc8 207 entry->Generator()->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
208 entry->Generator()->Generate();
209 entry->SetLast(partArray->GetEntriesFast());
210 preventry = entry;
211 }
c89fc3f1 212 } else if (fRandom) {
1ebe6dc8 213 //
214 // Select a generator randomly
215 //
216 Int_t i;
217 Float_t p0 = gRandom->Rndm();
218
219 for (i = 0; i < fNGenerators; i++) {
220 if (p0 < fProb[i]) break;
a8408367 221 }
1ebe6dc8 222
223 entry = (AliGenCocktailEntry*) fEntries->At(i);
224 entry->SetFirst(0);
225 gen = entry->Generator();
c8f7f6f9 226 entry->Generator()->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
374924b5 227 entry->Generator()->Generate();
228 entry->SetLast(partArray->GetEntriesFast());
c89fc3f1 229 }
1ebe6dc8 230
374924b5 231 next.Reset();
4f85aa78 232
67db3ff2 233// Event Vertex
4f85aa78 234 fHeader->SetPrimaryVertex(eventVertex);
bcee5fdf 235 fHeader->CalcNProduced();
4f85aa78 236 gAlice->SetGenEventHeader(fHeader);
374924b5 237}
fe4da5cc 238
c44d1c08 239void AliGenCocktail::SetVertexSmear(VertexSmear_t smear)
240{
241// Set vertex smearing and propagate it to the generators
242
243 AliGenerator::SetVertexSmear(smear);
244 TIter next(fEntries);
245 while (AliGenCocktailEntry* entry = (AliGenCocktailEntry*)next()) {
246 entry->Generator()->SetVertexSmear(smear);
247 }
248}
249
fe4da5cc 250AliGenCocktailEntry * AliGenCocktail::FirstGenerator()
251{
374924b5 252// Iterator over generators: Initialisation
fe4da5cc 253 flnk1 = fEntries->FirstLink();
254 if (flnk1) {
255 return (AliGenCocktailEntry*) (flnk1->GetObject());
256 } else {
257 return 0;
258 }
259}
260
261AliGenCocktailEntry* AliGenCocktail::NextGenerator()
262{
374924b5 263// Iterator over generators: Increment
fe4da5cc 264 flnk1 = flnk1->Next();
265 if (flnk1) {
266 return (AliGenCocktailEntry*) (flnk1->GetObject());
267 } else {
268 return 0;
269 }
270}
271
272void AliGenCocktail::
273FirstGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
274{
374924b5 275// Iterator over generator pairs: Initialisation
fe4da5cc 276 flnk2 = flnk1 = fEntries->FirstLink();
277 if (flnk1) {
278 e2 = e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
279 } else {
280 e2= e1 = 0;
281 }
282}
283
284void AliGenCocktail::
285NextGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
286{
374924b5 287// Iterator over generators: Increment
fe4da5cc 288 flnk2 = flnk2->Next();
289 if (flnk2) {
290 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
291 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
292 } else {
293 flnk2 = flnk1 = flnk1->Next();
294 if (flnk1) {
295 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
296 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
297 } else {
298 e1=0;
299 e2=0;
300 }
301 }
302}
303
4f85aa78 304void AliGenCocktail::AddHeader(AliGenEventHeader* header)
305{
306// Add a header to the list
307 if (fHeader) fHeader->AddHeader(header);
308}
fe4da5cc 309
198bb1c7 310
311
fe4da5cc 312