/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_13_patch3/src/TopQuarkAnalysis/TopEventProducers/src/TopInitSubset.cc

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#include "TopQuarkAnalysis/TopEventProducers/interface/TopInitSubset.h"

TopInitSubset::TopInitSubset(const edm::ParameterSet& cfg):
  src_ ( cfg.getParameter<edm::InputTag>( "src" ) )
{
  produces<reco::GenParticleCollection>();
}

TopInitSubset::~TopInitSubset()
{
}

void
TopInitSubset::produce(edm::Event& evt, const edm::EventSetup& setup)
{     
  edm::Handle<reco::GenParticleCollection> src;
  evt.getByLabel(src_, src);
  
  const reco::GenParticleRefProd ref = evt.getRefBeforePut<reco::GenParticleCollection>(); 
  std::auto_ptr<reco::GenParticleCollection> sel( new reco::GenParticleCollection );

  //fill output collection
  fillOutput( *src, *sel );

  evt.put( sel );
}

void TopInitSubset::fillOutput(const reco::GenParticleCollection& src, reco::GenParticleCollection& sel)
{
  for(reco::GenParticleCollection::const_iterator t=src.begin(); t!=src.end(); ++t){
    if( std::abs(t->pdgId())==TopInitID::tID ){
      bool hasTopMother = false;
      for(unsigned idx=0; idx<t->numberOfMothers(); ++idx)
        if( std::abs(t->mother(idx)->pdgId())==TopInitID::tID )
          hasTopMother = true;
      if(hasTopMother)
        continue;
      for(unsigned idx=0; idx<t->numberOfMothers(); ++idx){
        reco::GenParticle* cand = new reco::GenParticle( t->mother(idx)->threeCharge(), t->mother(idx)->p4(), 
                                                         t->mother(idx)->vertex(), t->mother(idx)->pdgId(), 
                                                         t->mother(idx)->status(), false );
        std::auto_ptr<reco::GenParticle> ptr( cand );
        sel.push_back( *ptr );
      }
      break;
    }
  }
}