//-----------------------------------------------------------
// File and Version Information:
// $Id$
//
// Description:
//      Ultra-trivial copying of EventIdentiefiers from the
//      TPC DAQ stream
//      
//
// Environment:
//      Software developed for a real detector
//
// Author List:
//      Felix Boehmer                     (original author)
//      Physik Department E18, TUM
//
//----------------------------------------------------------


#include "TpcEventIdCopyTask.h"
#include "TClonesArray.h"
#include "TpcEventIdentifier.h"
#include <sstream>

TpcEventIdCopyTask::TpcEventIdCopyTask() 
  : fEvtIdInBranch("TpcEventIdentifier"),
    fEvtIdOutBranch("TpcEventIdentifier"),
    fPersistence(kTRUE)   //doesn't make much sense otherwise .. 
{;}

TpcEventIdCopyTask::~TpcEventIdCopyTask()
{;}

InitStatus
TpcEventIdCopyTask::Init() {
  //connect to the framework:
  FairRootManager* ioman = FairRootManager::Instance();
  if(ioman==0) {
    Fatal("TpcEventIdCopyTask::Init()","RootManager not instantiated!");
    return kFATAL;
  }
  
  //get input stuff
  fEvtIn = (TClonesArray*) ioman->GetObject(fEvtIdInBranch);
  
  //register output arrays
  fEvtOut = new TClonesArray("TpcEventIdentifier");
  ioman->Register(fEvtIdOutBranch, "Tpc", fEvtOut, fPersistence);
}

void
TpcEventIdCopyTask::Exec(Option_t* opt) {
  fEvtOut->Delete();
  unsigned int nIds = fEvtIn->GetEntriesFast();
  if(nIds!=1) {
    std::string str("Less or more than one EvtID in Input tree (");
    std::stringstream ss;
    ss<<nIds;
    str.append(ss.str());
    str.append(")!!!");
    Warning("TpcEventIdCopyTask::Init()",str.c_str());
    unsigned int nEntr = fEvtOut->GetEntriesFast();
    TpcEventIdentifier* err = new ((*fEvtOut)[nEntr]) TpcEventIdentifier(0,0);
    return;
  }
  TpcEventIdentifier* current = (TpcEventIdentifier*)fEvtIn->At(0);
  new ((*fEvtOut)[fEvtOut->GetEntriesFast()]) TpcEventIdentifier(*current);
}

ClassImp(TpcEventIdCopyTask)