From 34f814131fb4a3f0e3caf78114e8e42a3db3aea0 Mon Sep 17 00:00:00 2001
From: gustavo <gustavo@f7af4fe6-9843-0410-8265-dc069ae4e863>
Date: Thu, 6 Dec 2007 09:18:52 +0000
Subject: [PATCH] Example macro to read ESDCaloClusters and ESDCaloCells

---
 EMCAL/macros/TestESDCaloClusterAndCell.C | 215 +++++++++++++++++++++++
 1 file changed, 215 insertions(+)
 create mode 100644 EMCAL/macros/TestESDCaloClusterAndCell.C

diff --git a/EMCAL/macros/TestESDCaloClusterAndCell.C b/EMCAL/macros/TestESDCaloClusterAndCell.C
new file mode 100644
index 00000000000..48a3f783a62
--- /dev/null
+++ b/EMCAL/macros/TestESDCaloClusterAndCell.C
@@ -0,0 +1,215 @@
+#if !defined(__CINT__) || defined(__MAKECINT__)
+
+//Root include files
+#include <Riostream.h>
+#include <TFile.h>
+#include <TChain.h>
+#include <TParticle.h>
+#include <TNtuple.h>
+#include <TCanvas.h>
+#include <TObjArray.h>
+#include <TSystem.h>
+#include <TString.h> 
+#include <TH1F.h> 
+#include <TVector.h> 
+#include <TParticle.h> 
+#include <TRefArray.h>
+#include <TArrayS.h>
+
+//AliRoot include files
+#include "AliRunLoader.h"
+#include "AliStack.h"
+#include "AliESDEvent.h"
+#include "AliESDVertex.h"
+#include "AliESDCaloCluster.h"
+#include "AliESDCaloCells.h"
+#include "AliPID.h"
+#include "AliLog.h" 
+
+#endif
+
+//example macro to extract information from AliESDCaloClusters and AliESDCaloCells.
+// Author: Gustavo.Conesa.Balbastre@cern.ch (INFN-LNF)
+
+TChain * AliReadESDfromdisk(const UInt_t eventsToRead, 
+				   const TString dirName, 
+				   const TString esdTreeName, 
+				   const char *  pattern) 
+{
+  // Reads ESDs from Disk
+ TChain *  rv = 0; 
+  
+  // create a TChain of all the files 
+  TChain * cESDTree = new TChain(esdTreeName) ; 
+
+  // read from the directory file until the require number of events are collected
+  void * from = gSystem->OpenDirectory(dirName) ;
+   if (!from) 
+     rv = 0 ;   
+  else{ // reading file names from directory
+    const char * subdir ; 
+    // search all subdirectories witch matching pattern
+    while( (subdir = gSystem->GetDirEntry(from))  && 
+	   (cESDTree->GetEntries() < eventsToRead)) {
+      if ( strstr(subdir, pattern) != 0 ) { 
+	char file[200] ; 
+        sprintf(file, "%s%s/AliESDs.root", dirName.Data(), subdir); 	
+	cESDTree->Add(file) ;
+      }
+    } // while file
+  
+    rv = cESDTree ; 
+    
+  } // reading file names from directory
+  return rv ; 
+}
+
+//======================================================================
+TChain * AliReadESD(const UInt_t eventsToRead,
+		  const TString dirName, 
+		  const TString esdTreeName, 
+		  const char *  pattern)  
+{
+  // Read AliESDs files and return a Chain of events
+ 
+  if ( dirName == "" ) 
+    return 0 ; 
+  if ( esdTreeName == "" ) 
+    return AliReadESDfromdisk(eventsToRead, dirName,"","") ;//Last 2 arguments are not necessary but pdsf compiler complains "","'
+  else if ( strcmp(pattern, "") == 0 )
+    return AliReadESDfromdisk(eventsToRead, dirName, esdTreeName,"") ;//Last argument is not necessary but pdsf compiler complains "","'
+  else 
+    return AliReadESDfromdisk(eventsToRead, dirName, esdTreeName, pattern) ;	    
+}
+
+//=====================================================================
+//  Do:
+//  .L TestESDCaloClusterAndCell.C++
+//  TestESDCaloClusterAndCell(calo, number of events to process)
+//=====================================================================
+void TestESDCaloClusterAndCell(TString det = "EMCAL", const UInt_t eventsToProcess = 5, 
+			TString dirName = "./", 
+			const TString esdTreeName = "esdTree", 
+			const char *  pattern = ".") 
+{ 
+
+  if(det !="EMCAL" && det !="PHOS" )
+ {
+   cout << "Wrong detector name "<<det<<endl; 
+   return;
+ }
+
+  //Create chain of esd trees
+  //By default the root files are in the same directory 
+  TChain * t = AliReadESD(eventsToProcess, dirName,esdTreeName,pattern) ; 
+ 
+  
+  // ESD
+  AliESDEvent * esd = new AliESDEvent(); 
+  esd->ReadFromTree(t); // This checks also if the branch address is already set
+
+  
+  //Define few variables to be used in macro
+  TString alirunName = "" ; 
+
+  UInt_t event ;
+  Float_t pos[3] ; 
+
+  for (event = 0; event < eventsToProcess; event++) {//event loop
+    //AliInfo( Form("Event %d \n",event) );  
+    Int_t nbytes = t->GetEntry(event); // store event in esd
+    if ( nbytes == 0 ) //If nothing in ESD 
+      break ; 
+    
+    // Check that name of file is correct
+    if (alirunName != t->GetFile()->GetName()) {        
+      alirunName = t->GetFile()->GetName() ; 
+      alirunName.ReplaceAll("galice.root", "AliESDs.root") ;
+    }
+    
+    AliRunLoader *rl = AliRunLoader::Open("galice.root",AliConfig::GetDefaultEventFolderName(),  "read");
+    rl->LoadKinematics();  
+    rl->GetEvent(event);
+    AliStack *sta=rl->Stack();
+
+    //get reconstructed vertex position     
+    Double_t vertex_position[3] ; 
+    esd->GetVertex()->GetXYZ(vertex_position) ; 
+    
+    //cout<<"Event >>>>>>>>>>>  "<<event<<" vertex >>> "<<vertex_position[0]<<" "<<vertex_position[1]<<" "<<vertex_position[2]<<endl;
+    
+    //Get CaloCells
+
+    AliESDCaloCells &cells= *(esd->GetEMCALCells());
+    if(det == "PHOS")  AliESDCaloCells &cells = *(esd->GetPHOSCells());
+    Int_t ncell = cells.GetNumberOfCells() ;  
+    Int_t type = cells.GetType();
+    cout<<">>> Event "<<event<<" ncells "<<ncell<< " type "<<type<<endl;
+    // Uncomment to see the full list of digit amplitudes and times.
+//     for (Int_t icell=  0; icell <  ncell; icell++) {
+//       cout<<"icell "<<icell<<
+// 	" ID "<<cells.GetCellNumber(icell)<<
+// 	" amp "<<cells.GetAmplitude(icell)<<
+// 	" time "<<cells.GetTime(icell)<<endl;
+
+//     }// cell loop
+
+    //Get the CaloClusters
+
+    //select EMCAL clusters only 
+    TRefArray * caloClusters  = new TRefArray();
+
+    if(det == "EMCAL") esd->GetEMCALClusters(caloClusters);
+    else if(det == "PHOS") esd->GetPHOSClusters(caloClusters);
+    
+    Int_t nclus = caloClusters->GetEntries() ;  
+   
+    cout<<"Event: "<<event<<"; Number of clusters "<<nclus<<endl;   
+    for (Int_t iclus =  0; iclus <  nclus; iclus++) {//////////////EMCAL cluster loop
+      AliESDCaloCluster * clus = (AliESDCaloCluster *) caloClusters->At(iclus) ; // retrieve cluster from esd
+      //cout<<">>>> Cluster >>>"<<iclus<<endl;
+	
+      //Get the cluster info
+      
+      Float_t energy   = clus->E() ;
+      //Float_t disp     = clus->GetClusterDisp() ;
+      Int_t iprim = clus->GetLabel();
+      
+      clus->GetPosition(pos) ;
+      TVector3 vpos(pos[0],pos[1],pos[2]) ;
+      TLorentzVector p ;
+      clus->GetMomentum(p,vertex_position);
+      
+      Int_t mult       = clus->GetNCells() ;
+      UShort_t * index = clus->GetCellsAbsId() ;
+      Double_t * fraction = clus->GetCellsAmplitudeFraction() ;
+      //Print cluster info
+      cout<<"Cluster "<<iclus <<"; digits mult "<<mult<<"; type "<<(Int_t )clus->GetClusterType()
+	  <<"; Energy "<<energy
+	  <<"; Phi "<<vpos.Phi()*180/TMath::Pi()<<"; Eta "<<vpos.Eta()
+	  <<"; label "<<iprim<<endl;      
+      //Print primary info
+      if(iprim>=0 && iprim < sta->GetNtrack()){
+	TParticle * particle = sta->Particle(clus->GetLabel());
+	//Print primary values
+	cout<<" Primary: "<<particle->GetName()<< "; Energy "<<particle->Energy()<<endl;    
+      }
+      else if( iprim >= sta->GetNtrack()) cout <<"PROBLEM, label is too large : "<<iprim<<" >= particles in stack "<< sta->GetNtrack() <<endl;
+      else cout<<"Negative label!!!  : "<<iprim<<endl;
+      
+      //Get CaloCells of cluster and print	 
+      for(Int_t i = 0; i < mult ; i++){
+	Int_t absId =   index[i]; // or clus->GetCellNumber(i) ;
+	Double_t ampFract =  fraction[i];
+	Float_t amp = cells.GetCellAmplitude(absId) ;
+	Float_t time = cells.GetCellTime(absId);
+	cout<<"AbsID : "<< absId << "; Amplitude "<< amp << "; Fraction "<<ampFract<<"; Time " <<time<<endl;
+      }
+      
+    }// clusters
+    
+  }// event loop
+  
+}
+
+
-- 
2.43.0