doxy: TPC/stressTest/testSparse converted
[u/mrichter/AliRoot.git] / EVGEN / AliGenExtFile.cxx
index a210198..4d26efa 100644 (file)
@@ -18,7 +18,7 @@
 // Event generator that using an instance of type AliGenReader
 // reads particles from a file and applies cuts.
 // Example: In your Config.C you can include the following lines
-//   AliGenExtFile *gener = new AliGenExtFile(-1);
+//  AliGenExtFile *gener = new AliGenExtFile(-1);
 //  gener->SetMomentumRange(0,999);
 //  gener->SetPhiRange(-180.,180.);
 //  gener->SetThetaRange(0,180);
 
 #include <Riostream.h>
 
+#include "AliLog.h"
 #include "AliGenExtFile.h"
-#include "AliRun.h"
+#include "AliRunLoader.h"
+#include "AliHeader.h"
+#include "AliStack.h"
+#include "AliGenEventHeader.h"
+#include "AliGenReader.h"
 
 #include <TParticle.h>
 #include <TFile.h>
 #include <TTree.h>
 
 
+using std::cout;
+using std::endl;
+using std::map;
+
 ClassImp(AliGenExtFile)
 
 AliGenExtFile::AliGenExtFile()
-  :AliGenMC()
+    :AliGenMC(),
+     fFileName(0),
+     fReader(0),
+     fStartEvent(0)
 {
 //  Constructor
 //
 //  Read all particles
-    fNpart  =- 1;
-    fReader =  0;
+    fNpart  = -1;
 }
 
 AliGenExtFile::AliGenExtFile(Int_t npart)
-    :AliGenMC(npart)
+    :AliGenMC(npart),
+     fFileName(0),
+     fReader(0),
+     fStartEvent(0)
 {
 //  Constructor
     fName   = "ExtFile";
     fTitle  = "Primaries from ext. File";
-    fReader = 0;
 }
 
-AliGenExtFile::AliGenExtFile(const AliGenExtFile & ExtFile):
-    AliGenMC(ExtFile)
-{
-// Copy constructor
-    ExtFile.Copy(*this);
-}
 //____________________________________________________________
 AliGenExtFile::~AliGenExtFile()
 {
@@ -80,26 +87,37 @@ void AliGenExtFile::Init()
     if (fReader) fReader->Init();
 }
 
-    
+//___________________________________________________________
 void AliGenExtFile::Generate()
 {
 // Generate particles
 
-  Float_t polar[3]  = {0,0,0};
+  Double_t polar[3]  = {0,0,0};
   //
-  Float_t origin[3] = {0,0,0};
-  Float_t p[3];
+  Double_t origin[3] = {0,0,0};
+  Double_t time = 0.;
+  Double_t p[4];
   Float_t random[6];
-  Int_t i = 0, j, nt;
+  Int_t i=0, j, nt;
   //
-  for (j=0;j<3;j++) origin[j]=fOrigin[j];
-  if(fVertexSmear == kPerTrack) {
-    Rndm(random,6);
-    for (j = 0; j < 3; j++) {
-       origin[j] += fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
-           TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
+  //
+  if (fVertexSmear == kPerEvent) Vertex();
+
+  // Fast forward up to start Event
+  for (Int_t ie=0; ie<fStartEvent; ++ie ) {
+    Int_t nTracks = fReader->NextEvent();      
+    if (nTracks == 0) {
+      // printf("\n No more events !!! !\n");
+      Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n");
+      return;
+    }
+    for (i = 0; i < nTracks; ++i) {
+      if (NULL == fReader->NextParticle())
+       AliFatal("Error while skipping tracks");
     }
-  }
+    cout << "Skipping event " << ie << endl;
+  }  
+  fStartEvent = 0; // do not skip events the second time 
 
   while(1) {
     Int_t nTracks = fReader->NextEvent();      
@@ -112,9 +130,9 @@ void AliGenExtFile::Generate()
     //
     // Particle selection loop
     //
-    // The selction criterium for the external file generator is as follows:
+    // The selection criterium for the external file generator is as follows:
     //
-    // 1) All tracks are subjects to the cuts defined by AliGenerator, i.e.
+    // 1) All tracks are subject to the cuts defined by AliGenerator, i.e.
     //    fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax,
     //    fYMin, fYMax.
     //    If the particle does not satisfy these cuts, it is not put on the
@@ -127,109 +145,154 @@ void AliGenExtFile::Generate()
     if(fCutOnChild) {
       // Count the selected children
       Int_t nSelected = 0;
-      while ( (iparticle=fReader->NextParticle()) ) {
-        ;
-       Int_t kf = CheckPDGCode(iparticle->GetPdgCode());
-       kf = TMath::Abs(kf);
-       if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) {
-         nSelected++;
-       }
+      while ((iparticle=fReader->NextParticle()) ) {
+         Int_t kf = CheckPDGCode(iparticle->GetPdgCode());
+         kf = TMath::Abs(kf);
+         if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) {
+             nSelected++;
+         }
       }
       if (!nSelected) continue;    // No particle selected:  Go to next event
       fReader->RewindEvent();
     }
 
     //
-    // Stack filling loop
+    // Stack selection loop
     //
+    class SelectorLogic { // need to do recursive back tracking, requires a "nested" function
+    private:
+       Int_t idCount;
+       map<Int_t,Int_t> firstMotherMap;
+       map<Int_t,Int_t> secondMotherMap;
+       map<Int_t,Bool_t> selectedIdMap;
+       map<Int_t,Int_t> newIdMap;
+       void selectMothersToo(Int_t particleId) {
+        Int_t mum1 = firstMotherMap[particleId];
+          if (mum1 > -1 && !selectedIdMap[mum1]) {
+             selectedIdMap[mum1] = true;
+             selectMothersToo(mum1);
+          }
+          Int_t mum2 = secondMotherMap[particleId];
+          if (mum2 > -1 && !selectedIdMap[mum2]) {
+             selectedIdMap[mum2] = true;
+             selectMothersToo(mum2);
+          }
+       }
+    public:
+      SelectorLogic():idCount(0), firstMotherMap(), secondMotherMap(), selectedIdMap(), newIdMap() {}
+      void init() {
+          idCount = 0;
+       }
+       void setData(Int_t id, Int_t mum1, Int_t mum2, Bool_t selected) {
+          idCount++; // we know that this function is called in succession of ids, so counting is fine to determine max id
+          firstMotherMap[id] = mum1;
+          secondMotherMap[id] = mum2;
+          selectedIdMap[id] = selected;
+       }
+       void reselectCuttedMothersAndRemapIDs() {
+          for (Int_t id = 0; id < idCount; ++id) {
+             if (selectedIdMap[id]) {
+                selectMothersToo(id);
+             }
+          }
+          Int_t newId0 = 0;
+          for (Int_t id = 0; id < idCount; id++) {
+             if (selectedIdMap[id]) {
+                newIdMap[id] = newId0; ++newId0;
+             } else {
+                newIdMap[id] = -1;
+             }
+          }
+       }
+       Bool_t isSelected(Int_t id) {
+          return selectedIdMap[id];
+       }
+       Int_t newId(Int_t id) {
+          if (id == -1) return -1;
+          return newIdMap[id];
+       }
+    };
+    SelectorLogic selector;
+    selector.init();
     for (i = 0; i < nTracks; i++) {
+       TParticle* jparticle = fReader->NextParticle();
+       selector.setData(i,
+             jparticle->GetFirstMother(),
+             jparticle->GetSecondMother(),
+             KinematicSelection(jparticle,0));
+    }
+    selector.reselectCuttedMothersAndRemapIDs();
+    fReader->RewindEvent();
 
-      TParticle* iparticle = fReader->NextParticle();
-      Bool_t selected = KinematicSelection(iparticle,0); 
-      if (!selected) {
-       Double_t  pz   = iparticle->Pz();
-       Double_t  e    = iparticle->Energy();
-       Double_t  y;
-       if ((e-pz) == 0) {
-         y = 20.;
-       } else if ((e+pz) == 0.) {
-         y = -20.;
+    //
+    // Stack filling loop
+    //
+    fNprimaries = 0;
+    for (i = 0; i < nTracks; i++) {
+       TParticle* jparticle = fReader->NextParticle();
+       Bool_t selected = selector.isSelected(i);
+       if (!selected) {
+          continue;
+       }
+       Int_t parent = selector.newId(jparticle->GetFirstMother());
+//       printf("particle %d -> %d, with mother %d -> %d\n", i, selector.newId(i), jparticle->GetFirstMother(), parent);
+
+       p[0] = jparticle->Px();
+       p[1] = jparticle->Py();
+       p[2] = jparticle->Pz();
+       p[3] = jparticle->Energy();
+       
+       Int_t idpart = jparticle->GetPdgCode();
+       if(fVertexSmear==kPerTrack) 
+       {
+           Rndm(random,6);
+           for (j = 0; j < 3; j++) {
+               origin[j]=fOrigin[j]+
+                   fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
+                   TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
+           }
+           Rndm(random,2);
+           time = fTimeOrigin + fOsigma[2]/TMath::Ccgs()*
+             TMath::Cos(2*random[0]*TMath::Pi())*
+             TMath::Sqrt(-2*TMath::Log(random[1]));
        } else {
-         y = 0.5*TMath::Log((e+pz)/(e-pz));      
+           origin[0] = fVertex[0] + jparticle->Vx();
+           origin[1] = fVertex[1] + jparticle->Vy();
+           origin[2] = fVertex[2] + jparticle->Vz();
+           time = fTime + jparticle->T();
        }
-       printf("\n Not selected %d %f %f %f %f %f", i,
-              iparticle->Theta(),
-              iparticle->Phi(),
-              iparticle->P(),
-              iparticle->Pt(),
-              y);
-       //PH    delete iparticle;
-       //      continue;
-      }
-      p[0] = iparticle->Px();
-      p[1] = iparticle->Py();
-      p[2] = iparticle->Pz();
-      Int_t idpart = iparticle->GetPdgCode();
-      if(fVertexSmear==kPerTrack) 
-       {
-         Rndm(random,6);
-         for (j = 0; j < 3; j++) {
-            origin[j]=fOrigin[j]+
-                      fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
-                        TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
-         }
-      }
-      Int_t decayed = iparticle->GetFirstDaughter();
-      Int_t doTracking = fTrackIt && (decayed < 0) &&
-                        (TMath::Abs(idpart) > 10) && selected;
-      // printf("*** pdg, first daughter, trk = %d, %d, %d\n",
-      //   idpart,decayed, doTracking);
-      //PH      PushTrack(doTracking,-1,idpart,p,origin,polar,0,kPPrimary,nt);
-      Int_t parent = iparticle->GetFirstMother();
-      PushTrack(doTracking,parent,idpart,p,origin,polar,0,kPPrimary,nt);
-      KeepTrack(nt);
+       Int_t doTracking = fTrackIt && selected && (jparticle->TestBit(kTransportBit));
+       
+       PushTrack(doTracking, parent, idpart,
+                 p[0], p[1], p[2], p[3], origin[0], origin[1], origin[2], time,
+                 polar[0], polar[1], polar[2],
+                 kPPrimary, nt, 1., jparticle->GetStatusCode());
+
+       KeepTrack(nt);
+       fNprimaries++;
     } // track loop
 
+    // Generated event header
+    AliGenEventHeader * header = fReader->GetGenEventHeader();
+    if (!header) header = new AliGenEventHeader();
+    header->SetNProduced(fNprimaries);
+    header->SetPrimaryVertex(fVertex);
+    header->SetInteractionTime(fTime);
+    AddHeader(header);
     break;
-
+    
   } // event loop
-
+  
   SetHighWaterMark(nt);
   CdEventFile();
 }
 
+//___________________________________________________________
 void AliGenExtFile::CdEventFile()
 {
 // CD back to the event file
-  TFile *pFile=0;
-  if (!gAlice) {
-      gAlice = (AliRun*)pFile->Get("gAlice");
-      if (gAlice) printf("AliRun object found on file\n");
-      if (!gAlice) gAlice = new AliRun("gAlice","Alice test program");
-  }
-  TTree *fAli=gAlice->TreeK();
-  if (fAli) pFile =fAli->GetCurrentFile();
-  pFile->cd();    
-}
-
-
-AliGenExtFile& AliGenExtFile::operator=(const  AliGenExtFile& rhs)
-{
-// Assignment operator
-    rhs.Copy(*this);
-    return *this;
+  AliRunLoader::Instance()->CdGAFile();
 }
-
-void AliGenExtFile::Copy(TObject&) const
-{
-    //
-    // Copy 
-    //
-    Fatal("Copy","Not implemented!\n");
-}
-
-