ProbeMulteplicityProducer.cc

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//

#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"

#include "DataFormats/Math/interface/deltaR.h"
#include "DataFormats/Common/interface/ValueMap.h"
#include "DataFormats/Common/interface/View.h"

#include "DataFormats/Candidate/interface/CandidateFwd.h"
#include "DataFormats/Candidate/interface/Candidate.h"
#include "CommonTools/Utils/interface/StringCutObjectSelector.h"


class ProbeMulteplicityProducer : public edm::EDProducer {
    public:
        explicit ProbeMulteplicityProducer(const edm::ParameterSet & iConfig);
        ~ProbeMulteplicityProducer() override ;

        void produce(edm::Event & iEvent, const edm::EventSetup & iSetup) override;

    private:
        edm::EDGetTokenT<reco::CandidateView> pairs_;            
        StringCutObjectSelector<reco::Candidate,true> pairCut_;  // lazy parsing, to allow cutting on variables not in reco::Candidate class
        StringCutObjectSelector<reco::Candidate,true> probeCut_; // lazy parsing, to allow cutting on variables not in reco::Candidate class
};


ProbeMulteplicityProducer::ProbeMulteplicityProducer(const edm::ParameterSet & iConfig) :
    pairs_(consumes<reco::CandidateView>(iConfig.getParameter<edm::InputTag>("pairs"))),
    pairCut_(iConfig.existsAs<std::string>("pairSelection") ? iConfig.getParameter<std::string>("pairSelection") : "", true),
    probeCut_(iConfig.existsAs<std::string>("probeSelection") ? iConfig.getParameter<std::string>("probeSelection") : "", true)
{
    produces<edm::ValueMap<float> >();
}



ProbeMulteplicityProducer::~ProbeMulteplicityProducer()
{
}


void 
ProbeMulteplicityProducer::produce(edm::Event & iEvent, const edm::EventSetup & iSetup) {
    using namespace edm;

    // read input
    Handle<View<reco::Candidate> > pairs;
    iEvent.getByToken(pairs_,  pairs);
    
    // fill
    unsigned int i = 0;
    std::vector<unsigned int> tagKeys;
    std::vector<float>        values;
    View<reco::Candidate>::const_iterator pair, endpairs = pairs->end();
    for (pair = pairs->begin(); pair != endpairs; ++pair, ++i) {
      reco::CandidateBaseRef probeRef = pair->daughter(1)->masterClone();
      unsigned int tagKey = pair->daughter(0)->masterClone().key();
      unsigned int copies = 1;
      if (pairCut_(*pair) && probeCut_(*probeRef)) {
          for (unsigned int j = 0; j < i; ++j) if (tagKeys[j] == tagKey) copies++;
          for (unsigned int j = 0; j < i; ++j) if (tagKeys[j] == tagKey) values[j] = copies;
      } else {
          tagKey = std::numeric_limits<unsigned int>::max();
          copies = 0;
      }
      tagKeys.push_back(tagKey); 
      values.push_back(copies);
    }

    // convert into ValueMap and store
    auto valMap = std::make_unique<ValueMap<float>>();
    ValueMap<float>::Filler filler(*valMap);
    filler.insert(pairs, values.begin(), values.end());
    filler.fill();
    iEvent.put(std::move(valMap));
}

#include "FWCore/Framework/interface/MakerMacros.h"
DEFINE_FWK_MODULE(ProbeMulteplicityProducer);