/data/refman/pasoursint/CMSSW_5_3_3/src/IOMC/NtupleConverter/src/H2RootNtplSource.cc

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/* \author: Joanna Weng
*  $Date: 1/2006
*/

#include "IOMC/NtupleConverter/interface/NtupleROOTFile.h"
#include "IOMC/NtupleConverter/interface/H2RootNtplSource.h"
#include "IOMC/NtupleConverter/interface/Ntuple2HepMCFiller.h"
#include "SimDataFormats/GeneratorProducts/interface/HepMCProduct.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include <iostream>


using namespace edm;
using namespace std;

//used for defaults

H2RootNtplSource::H2RootNtplSource( const ParameterSet & pset, InputSourceDescription const& desc ) :
ExternalInputSource(pset, desc),  
evt(0), firstEvent_ (pset.getUntrackedParameter<unsigned int>("firstEvent",0)),
reader_( Ntuple2HepMCFiller::instance() ){
        

        cout << "H2RootNtplSource: Reading HepMC file: " << fileNames()[0] << endl;
        string fileName = fileNames()[0];
        // strip the file: 
        if ( ! fileName.find("file:")){
          fileName.erase(0,5);
        }   
        //Max number of events processed  
        cout << "H2RootNtplSource: Number of events to be processed = " << maxEvents() << endl;
        
        //First event
        firstEvent_ = pset.getUntrackedParameter<unsigned int>("firstEvent",0);
        cout << "H2RootNtplSource: Number of first event  = " << firstEvent_ << endl;   

        reader_->initialize(fileName,101);  
        reader_->setEvent(firstEvent_);
        produces<HepMCProduct>();

}


H2RootNtplSource::~H2RootNtplSource(){
        clear();
}

void H2RootNtplSource::clear() {
}

bool H2RootNtplSource::produce(Event & e) {
        

        // no need to clean up GenEvent memory - now done in HepMCProduct
        //if ( evt != NULL ) delete evt ;
   
                
                auto_ptr<HepMCProduct> bare_product(new HepMCProduct());  
                cout << "H2RootNtplSource: Start Reading  " << endl;
                evt = reader_->fillCurrentEventData(); 
                if(evt)  {
                  bare_product->addHepMCData(evt );
                  e.put(bare_product);
                  return true;
                }
                else return false;
        
        
}