/**************************************************************************
 * Copyright(c) 1998-2007, 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.                  *
 **************************************************************************/

/* $Id$ */

//-------------------------------------------------------------------------
//     Event handler for ESD input 
//     Author: Andreas Morsch, CERN
//-------------------------------------------------------------------------

#include <TTree.h>
#include <TString.h>
#include <TObjString.h>

#include "AliESDInputHandler.h"
#include "AliESDEvent.h"
#include "AliESD.h"
#include "AliLog.h"

ClassImp(AliESDInputHandler)

//______________________________________________________________________________
AliESDInputHandler::AliESDInputHandler() :
  AliInputEventHandler(),
  fEvent(0x0),
  fBranches("")
{
  // default constructor
}

//______________________________________________________________________________
AliESDInputHandler::~AliESDInputHandler() 
{
  // destructor
  //  delete fEvent;
}

//______________________________________________________________________________
AliESDInputHandler::AliESDInputHandler(const char* name, const char* title):
    AliInputEventHandler(name, title), fEvent(0x0), fBranches("")
{
}

Bool_t AliESDInputHandler::Init(TTree* tree,  Option_t* /*opt*/)
{
    // Initialisation necessary for each new tree 
    fTree = tree;
    
    if (!fTree) return kFALSE;
    // Get pointer to ESD event
    SwitchOffBranches();
    SwitchOnBranches();
    
    if (fEvent) {
      delete fEvent;
      fEvent = 0;
    }
    fEvent = new AliESDEvent();

    fEvent->ReadFromTree(fTree);
    return kTRUE;
}

Bool_t AliESDInputHandler::BeginEvent(Long64_t /*entry*/)
{
    // Copy from old to new format if necessary
  AliESD* old = ((AliESDEvent*) fEvent)->GetAliESDOld();
  if (old) {
	((AliESDEvent*)fEvent)->CopyFromOldESD();
	old->Reset();
  }
  return kTRUE;
}

Bool_t  AliESDInputHandler::FinishEvent(){
  if(fEvent)fEvent->Reset();
  return kTRUE;
} 

void AliESDInputHandler::SwitchOffBranches() const {
  //
  // Switch of branches on user request
    TObjArray * tokens = fBranches.Tokenize(" ");
    Int_t ntok = tokens->GetEntries();
    for (Int_t i = 0; i < ntok; i++)  {
	TString str = ((TObjString*) tokens->At(i))->GetString();
	if (str.Length() == 0)
	    continue;
	fTree->SetBranchStatus(Form("%s%s%s","*", str.Data(), "*"), 0);
	AliInfo(Form("Branch %s switched off \n", str.Data()));
    }
}

void AliESDInputHandler::SwitchOnBranches() const {
  //
  // Switch of branches on user request
  TObjArray * tokens = fBranchesOn.Tokenize(" ");
  Int_t ntok = tokens->GetEntries();

  for (Int_t i = 0; i < ntok; i++)  {
      TString str = ((TObjString*) tokens->At(i))->GetString();
      if (str.Length() == 0)
	  continue;
      fTree->SetBranchStatus(Form("%s%s%s","*", str.Data(), "*"), 1);
      AliInfo(Form("Branch %s switched on \n", str.Data()));
  }
}