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/** \class HiMCTrackMatcher
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*
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* \author Philip Allfrey, University of Auckland
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* Modified from MCTrackMatcher.cc
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*
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* \version $Id: HiMCTrackMatcher.cc,v 1.1 2009/09/07 23:00:44 allfrey Exp $
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*
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*/
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#include "FWCore/Framework/interface/EDProducer.h"
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#include "FWCore/Utilities/interface/InputTag.h"
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#include "DataFormats/Common/interface/Association.h"
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#include "DataFormats/HepMCCandidate/interface/GenParticle.h"
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namespace edm { class ParameterSet; }
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class HiMCTrackMatcher : public edm::EDProducer {
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public:
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/// constructor
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HiMCTrackMatcher( const edm::ParameterSet & );
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private:
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void produce( edm::Event& evt, const edm::EventSetup& es );
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std::string associator_;
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edm::InputTag tracks_, genParticles_, trackingParticles_;
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typedef edm::Association<reco::GenParticleCollection> GenParticleMatch;
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};
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#include "DataFormats/Common/interface/Handle.h"
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#include "FWCore/Framework/interface/ESHandle.h"
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#include "FWCore/Framework/interface/Event.h"
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#include "FWCore/Utilities/interface/EDMException.h"
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#include "FWCore/ParameterSet/interface/ParameterSet.h"
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#include "SimTracker/Records/interface/TrackAssociatorRecord.h"
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#include "SimTracker/TrackAssociation/interface/TrackAssociatorBase.h"
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#include "SimDataFormats/TrackingAnalysis/interface/TrackingParticle.h"
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#include "SimGeneral/TrackingAnalysis/interface/EncodedTruthId.h"
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using namespace edm;
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using namespace std;
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using namespace reco;
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HiMCTrackMatcher::HiMCTrackMatcher(const ParameterSet & p) :
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associator_(p.getParameter<string>("associator")),
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tracks_(p.getParameter<InputTag>("tracks")),
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genParticles_( p.getParameter<InputTag>("genParticles")),
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trackingParticles_( p.getParameter<InputTag>("trackingParticles")) {
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produces<GenParticleMatch>();
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}
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void HiMCTrackMatcher::produce(Event& evt, const EventSetup& es) {
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ESHandle<TrackAssociatorBase> assoc;
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es.get<TrackAssociatorRecord>().get(associator_,assoc);
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const TrackAssociatorBase * associator = assoc.product();
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Handle<View<Track> > tracks;
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evt.getByLabel(tracks_, tracks);
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Handle<TrackingParticleCollection> trackingParticles;
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evt.getByLabel(trackingParticles_,trackingParticles);
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//Handle<vector<int> > barCodes;
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//evt.getByLabel(genParticles_, barCodes );
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Handle<map<EncodedTruthId, unsigned int> > barCodes;
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evt.getByLabel(genParticles_, barCodes );
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Handle<GenParticleCollection> genParticles;
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evt.getByLabel(genParticles_, genParticles );
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RecoToSimCollection associations = associator->associateRecoToSim ( tracks, trackingParticles, & evt );
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auto_ptr<GenParticleMatch> match(new GenParticleMatch(GenParticleRefProd(genParticles)));
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GenParticleMatch::Filler filler(*match);
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size_t n = tracks->size();
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vector<int> indices(n,-1);
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for (size_t i = 0; i < n; ++ i ) {
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RefToBase<Track> track(tracks, i);
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RecoToSimCollection::const_iterator f = associations.find(track);
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if ( f != associations.end() ) {
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TrackingParticleRef tp = f->val.front().first;
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const HepMC::GenParticle * particle = 0;
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TrackingParticle::genp_iterator j, b = tp->genParticle_begin(), e = tp->genParticle_end();
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for( j = b; j != e; ++ j ) {
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const HepMC::GenParticle * p = j->get();
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if (p->status() == 1) {
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particle = p; break;
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}
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}
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if( particle != 0 ) {
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int barCode = particle->barcode();
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// vector<int>::const_iterator
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// b = barCodes->begin(), e = barCodes->end(), f = find( b, e, barCode );
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EncodedTruthId etid(tp->eventId(),barCode);
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map<EncodedTruthId, unsigned int>::const_iterator b = barCodes->begin(), e = barCodes->end(), f = barCodes->find(etid);
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if(f == e) throw edm::Exception(errors::InvalidReference)
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<< "found matching particle with EncodedTruthId" << "(" << etid.event() << ", " << etid.index() << ")"
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<< " which has not been found in " << genParticles_;
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indices[i] = (*f).second;
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}
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}
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}
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filler.insert(tracks, indices.begin(), indices.end());
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filler.fill();
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evt.put(match);
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}
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#include "FWCore/Framework/interface/MakerMacros.h"
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DEFINE_FWK_MODULE( HiMCTrackMatcher );
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