ALICE interface to Pythia8

[u/mrichter/AliRoot.git] / STEER / ReadESDfriend.C

diff --git a/STEER/ReadESDfriend.C b/STEER/ReadESDfriend.C
index 780bfe2aa349b64b968fad95c34554f6e4975135..62e3d30784f775c460593035f0bcb6c8834542ab 100644 (file)
--- a/STEER/ReadESDfriend.C
+++ b/STEER/ReadESDfriend.C
@@ -6,39 +6,73 @@
 #if !defined( __CINT__) || defined(__MAKECINT__)
   #include <Riostream.h>
   #include <TFile.h>
-  #include <TTree.h>
+  #include <TChain.h>
 
-  #include "AliESD.h"
+  #include "AliESDEvent.h"
   #include "AliESDfriend.h"
+  #include "AliTrackPointArray.h"
 #endif
 
 void ReadESDfriend(Bool_t readFriend=kTRUE) {
-   TFile f("AliESDs.root");
-   TTree *esdTree=(TTree*)f.Get("esdTree");
-   AliESD *ev=0;
-   esdTree->SetBranchAddress("ESD",&ev);
+   Char_t *name[]={
+     //Put here the names of the ESD files to be chained
+     "AliESDs.root"
+   };
+   Int_t n=sizeof(name)/sizeof(Char_t *); 
+   TChain *esdTree=new TChain("esdTree");
+   for (Int_t i=0; i<n; i++) esdTree->AddFile(name[i]);
 
-   // Attach the tree with ESD friends
+   AliESDEvent *ev= new AliESDEvent();
+   if(readFriend)esdTree->SetBranchStatus("ESDfriend*",1);
+   ev->ReadFromTree(esdTree);
+
+   // Attach the branch with ESD friends
    AliESDfriend *evf=0;
    if (readFriend) {
-      esdTree->AddFriend("esdFriendTree","AliESDfriends.root");
-      esdTree->SetBranchAddress("ESDfriend",&evf);
+     evf = (AliESDfriend*)ev->FindListObject("AliESDfriend");
+     if(!evf){
+       // works for both, we just want to avoid setting the branch adress twice
+       // in case of the new ESD
+       esdTree->SetBranchAddress("ESDfriend.",&evf); 
+     }
    }
 
    Int_t nev=esdTree->GetEntries();
    for (Int_t i=0; i<nev; i++) {
-       cout<<"Event number: "<<i<<endl;
        esdTree->GetEntry(i);
-        
-       ev->SetESDfriend(evf); //Attach the friend to the ESD
-
-    // Now the attached information can be accessed via pointer to ESD.
-    // Example: indices of the TPC clusters associated with the track number 0.
-       const AliESDtrack *t=ev->GetTrack(0);
-       Int_t idx[AliESDfriendTrack::kMaxTPCcluster], n=t->GetTPCclusters(idx);
-       cout<<"Number of TPC clusters: "<<n<<endl;
-       cout<<"Index of the 7th TPC cluster: "<<idx[7]<<endl<<endl; 
+       if(ev->GetAliESDOld())ev->CopyFromOldESD();
+      
+       cout<<endl<<"Event number: "<<i<<endl;
+       Int_t ntr=ev->GetNumberOfTracks();
+       cout<<"Number of tracks: "<<ntr<<endl;
+       // Now the attached information can be accessed via pointer to ESD.
+       // Example: indices of the TPC clusters associated with the track number 0.
+       if (ntr > 0) {
+        ev->SetESDfriend(evf); //Attach the friend to the ESD
+        const AliESDtrack *t=ev->GetTrack(0);
+        Int_t idx[AliESDfriendTrack::kMaxTPCcluster]; 
+        n=t->GetTPCclusters(idx);
+        cout<<"Number of friend tracks: "<<evf->GetNumberOfTracks() <<endl;
+        cout<<"Track number 0"<<endl;
+        cout<<"   Number of TPC clusters: "<<n<<endl;
+        cout<<"   Index of the 1st TPC cluster: "  <<idx[1]<<endl;
+        UChar_t map=t->GetITSClusterMap();
+        cout<<"   ITS cluster map (from SPDs to SSDs):\n";
+        for (Int_t k=0; k<6; k++) printf(" Bit %d: %d\n",k,(map&(1<<k))==(1<<k)) <<' ';
+        
+        // Example: track points associated with the track number 0.
+        const AliTrackPointArray *pa=t->GetTrackPointArray();
+        if (pa != 0) {
+          n=pa->GetNPoints();
+          const Float_t *x=pa->GetX();
+          cout<<"   Number of track points: "<<n<<endl;
+          if (n>7)
+             cout<<"   X coordinate of the 7th track point: "<<x[7]<<endl;
+        }
+        
+       }
+       
    }
-
+   delete ev;
    delete esdTree;
 }