From 8020fb14c833f5d330787dec379da58baacf6d6e Mon Sep 17 00:00:00 2001
From: morsch <morsch@f7af4fe6-9843-0410-8265-dc069ae4e863>
Date: Fri, 9 Nov 2001 09:11:24 +0000
Subject: [PATCH] Realisation of AliGenReader that reads the kine tree (TreeK).

---
 EVGEN/AliGenReaderTreeK.cxx | 99 +++++++++++++++++++++++++++++++++++++
 EVGEN/AliGenReaderTreeK.h   | 43 ++++++++++++++++
 2 files changed, 142 insertions(+)
 create mode 100644 EVGEN/AliGenReaderTreeK.cxx
 create mode 100644 EVGEN/AliGenReaderTreeK.h

diff --git a/EVGEN/AliGenReaderTreeK.cxx b/EVGEN/AliGenReaderTreeK.cxx
new file mode 100644
index 00000000000..880c7428541
--- /dev/null
+++ b/EVGEN/AliGenReaderTreeK.cxx
@@ -0,0 +1,99 @@
+/**************************************************************************
+ * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ *                                                                        *
+ * Author: The ALICE Off-line Project.                                    *
+ * Contributors are mentioned in the code where appropriate.              *
+ *                                                                        *
+ * Permission to use, copy, modify and distribute this software and its   *
+ * documentation strictly for non-commercial purposes is hereby granted   *
+ * without fee, provided that the above copyright notice appears in all   *
+ * copies and that both the copyright notice and this permission notice   *
+ * appear in the supporting documentation. The authors make no claims     *
+ * about the suitability of this software for any purpose. It is          *
+ * provided "as is" without express or implied warranty.                  *
+ **************************************************************************/
+
+/*
+$Log$
+*/
+#include <TFile.h>
+#include <TTree.h>
+#include <TParticle.h>
+
+#include "AliGenReaderTreeK.h"
+#include "AliStack.h"
+#include "AliHeader.h"
+#include "AliRun.h"
+
+ClassImp(AliGenReaderTreeK);
+
+
+AliGenReaderTreeK::AliGenReaderTreeK():AliGenReader() 
+{
+//  Default constructor
+    fFileName       = NULL;
+    fStack          = 0;
+    fHeader         = 0;
+    fNcurrent       = 0;
+    fNparticle      = 0;
+    fFile           = 0;
+    fBaseFile       = 0;
+}
+
+void AliGenReaderTreeK::Init() 
+{
+// Initialization
+// Connect base file and file to read from
+
+    TTree *ali = gAlice->TreeE();
+    if (ali) {
+	fBaseFile = ali->GetCurrentFile();
+    } else {
+	printf("\n Warning: Basefile cannot be found !\n");
+    }
+    fFile = new TFile(fFileName);
+}
+
+Int_t AliGenReaderTreeK::NextEvent() 
+{
+// Read the next event  
+//  cd to file with old kine tree    
+    if (!fBaseFile) Init();
+    if (fStack) delete fStack;
+    fStack = new AliStack(1000);
+    fFile->cd();
+//  Connect treeE
+    TTree* treeE = (TTree*)gDirectory->Get("TE");
+    treeE->ls();
+    if (fHeader) delete fHeader;
+    fHeader = 0;
+    treeE->SetBranchAddress("Header", &fHeader);
+//  Get next event
+    treeE->GetEntry(fNcurrent);
+    fStack = fHeader->Stack();
+    fStack->GetEvent(fNcurrent);
+    
+//  cd back to base file
+    fBaseFile->cd();
+//
+    fNcurrent++;
+    fNparticle = 0;
+    Int_t ntrack =  fStack->GetNtrack();
+    printf("\n Next event contains %d particles", ntrack);
+    
+    return  ntrack;
+}
+
+TParticle* AliGenReaderTreeK::NextParticle() 
+{
+//  Return next particle
+    TParticle* part = fStack->Particle(fNparticle);
+    fNparticle++;
+    return part;
+}
+
+
+
+
+
+
diff --git a/EVGEN/AliGenReaderTreeK.h b/EVGEN/AliGenReaderTreeK.h
new file mode 100644
index 00000000000..bbe0a65befb
--- /dev/null
+++ b/EVGEN/AliGenReaderTreeK.h
@@ -0,0 +1,43 @@
+#ifndef ALIGENREADERTreeK_H
+#define ALIGENREADERTREEK_H
+/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ * See cxx source for full Copyright notice                               */
+
+/* $Id$ */
+
+#include "AliGenReader.h"
+class TFile;
+class AliStack;
+class AliHeader;
+
+
+class AliGenReaderTreeK : public AliGenReader
+{
+ public:
+    AliGenReaderTreeK();
+    
+    AliGenReaderTreeK(const AliGenReaderTreeK &reader){;}
+    virtual ~AliGenReaderTreeK(){;}
+    // Initialise 
+    virtual void Init();
+    // Read
+    virtual Int_t NextEvent();
+    virtual TParticle*  NextParticle();
+    AliGenReaderTreeK & operator=(const AliGenReader & rhs);
+ protected:
+    Int_t             fNcurrent;          // points to the next entry
+    Int_t             fNparticle;         // Next particle in list
+    Int_t             fNp;                // number of particles
+    TFile            *fFile;              //! pointer to file
+    TFile            *fBaseFile;          //! pointer to base file
+    AliStack         *fStack;             //! Particle stack
+    AliHeader        *fHeader;            //! Pointer to event header
+    ClassDef(AliGenReaderTreeK,1) // Read particles from TreeK
+};
+#endif
+
+
+
+
+
+
-- 
2.43.0