From 325a20c45e344b1d35058af075393a3afc9d32d4 Mon Sep 17 00:00:00 2001
From: morsch <morsch@f7af4fe6-9843-0410-8265-dc069ae4e863>
Date: Mon, 7 Jul 2008 13:52:37 +0000
Subject: [PATCH] Give back a clone of the original chain.

---
 ANALYSIS/AliEventPoolLoop.cxx | 31 +++++++++++++++++++++++++++----
 ANALYSIS/AliEventPoolLoop.h   |  2 ++
 2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/ANALYSIS/AliEventPoolLoop.cxx b/ANALYSIS/AliEventPoolLoop.cxx
index f16128b59fc..dd3dc78eb01 100644
--- a/ANALYSIS/AliEventPoolLoop.cxx
+++ b/ANALYSIS/AliEventPoolLoop.cxx
@@ -24,6 +24,9 @@
 
 
 #include "AliEventPoolLoop.h"
+#include <TChain.h>
+#include <TFile.h>
+#include <TObjArray.h>
 
 ClassImp(AliEventPoolLoop)
 
@@ -33,7 +36,8 @@ ClassImp(AliEventPoolLoop)
 AliEventPoolLoop::AliEventPoolLoop():
     AliVEventPool(),
     fMaxIterations(0),
-    fNIteration(0)
+    fNIteration(0),
+    fChainClone(0)
 {
   // Default constructor
 }
@@ -41,7 +45,8 @@ AliEventPoolLoop::AliEventPoolLoop():
 AliEventPoolLoop::AliEventPoolLoop(Int_t nit):
     AliVEventPool(),
     fMaxIterations(nit),
-    fNIteration(0)
+    fNIteration(0),
+    fChainClone(0)
 {
   // Default constructor
 }
@@ -49,7 +54,8 @@ AliEventPoolLoop::AliEventPoolLoop(Int_t nit):
 AliEventPoolLoop::AliEventPoolLoop(const char* name, const char* title):
     AliVEventPool(name, title),
     fMaxIterations(0),
-    fNIteration(0)
+    fNIteration(0),
+    fChainClone(0)
 {
   // Constructor
 }
@@ -88,7 +94,24 @@ TChain* AliEventPoolLoop::GetNextChain()
 	return (0);
     } else {
 	fNIteration++;
-	return fChain;
+	/*
+	if (fChainClone) {
+	  fChainClone->Reset();
+	  new (fChainClone) TChain(fChain->GetName());
+	} else {
+	  fChainClone = new TChain(fChain->GetName());
+	}
+	TObjArray* files = fChain->GetListOfFiles();
+	Int_t n = files->GetEntriesFast();
+	for (Int_t i = 0; i < n; i++) {
+	  TFile* file = (TFile*) (files->At(i));
+	  fChainClone->AddFile(file->GetTitle());
+	  printf("Adding %s %s %s\n", fChainClone->GetName(), file->GetName(), file->GetTitle());
+
+	}
+	*/
+	fChainClone = (TChain*) (fChain->Clone());
+	return fChainClone;
     }
 }
 
diff --git a/ANALYSIS/AliEventPoolLoop.h b/ANALYSIS/AliEventPoolLoop.h
index 6d21d4d75a5..87ce186c3f1 100644
--- a/ANALYSIS/AliEventPoolLoop.h
+++ b/ANALYSIS/AliEventPoolLoop.h
@@ -18,6 +18,7 @@ class AliLHCTagCuts;
 class AliDetectorTagCuts;
 class AliEventTagCuts;
 class AliTagAnalysis;
+class TChain;
 
 class AliEventPoolLoop : public AliVEventPool
 {
@@ -38,6 +39,7 @@ class AliEventPoolLoop : public AliVEventPool
  protected:
     Int_t fMaxIterations;
     Int_t fNIteration;
+    TChain* fChainClone; // Clone of the original 
     ClassDef(AliEventPoolLoop, 0); 
 };
  
-- 
2.39.3