GenJetGenPartMerger.cc

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// system include files
#include <memory>

// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/stream/EDProducer.h"

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"

#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/StreamID.h"

#include "DataFormats/JetReco/interface/GenJetCollection.h"
#include "DataFormats/HepMCCandidate/interface/GenParticle.h"

#include "DataFormats/Common/interface/ValueMap.h"

//
// class declaration
//

class GenJetGenPartMerger : public edm::stream::EDProducer<> {
public:
  explicit GenJetGenPartMerger(const edm::ParameterSet&);
  ~GenJetGenPartMerger() override;

private:
  void beginStream(edm::StreamID) override;
  void produce(edm::Event&, const edm::EventSetup&) override;
  void endStream() override;

  const edm::EDGetTokenT<reco::GenJetCollection> jetToken_;
  const edm::EDGetTokenT<reco::GenParticleCollection> partToken_;
  const edm::EDGetTokenT<edm::ValueMap<bool>> tauAncToken_;
};

//
// constants, enums and typedefs
//

//
// static data member definitions
//

//
// constructors and destructor
//
GenJetGenPartMerger::GenJetGenPartMerger(const edm::ParameterSet& iConfig)
    : jetToken_(consumes<reco::GenJetCollection>(iConfig.getParameter<edm::InputTag>("srcJet"))),
      partToken_(consumes<reco::GenParticleCollection>(iConfig.getParameter<edm::InputTag>("srcPart"))),
      tauAncToken_(consumes<edm::ValueMap<bool>>(iConfig.getParameter<edm::InputTag>("hasTauAnc"))) {
  produces<reco::GenJetCollection>("merged");
  produces<edm::ValueMap<bool>>("hasTauAnc");
}

GenJetGenPartMerger::~GenJetGenPartMerger() {}

//
// member functions
//

// ------------ method called to produce the data  ------------
void GenJetGenPartMerger::produce(edm::Event& iEvent, const edm::EventSetup& iSetup) {
  using namespace edm;
  std::unique_ptr<reco::GenJetCollection> merged(new reco::GenJetCollection);

  std::vector<bool> hasTauAncValues;

  edm::Handle<reco::GenJetCollection> jetHandle;
  iEvent.getByToken(jetToken_, jetHandle);

  edm::Handle<reco::GenParticleCollection> partHandle;
  iEvent.getByToken(partToken_, partHandle);

  edm::Handle<edm::ValueMap<bool>> tauAncHandle;
  iEvent.getByToken(tauAncToken_, tauAncHandle);

  for (unsigned int ijet = 0; ijet < jetHandle->size(); ++ijet) {
    auto jet = jetHandle->at(ijet);
    merged->push_back(reco::GenJet(jet));
    reco::GenJetRef jetRef(jetHandle, ijet);
    hasTauAncValues.push_back((*tauAncHandle)[jetRef]);
  }

  for (auto& part : *partHandle) {
    reco::GenJet jet;
    jet.setP4(part.p4());
    jet.setPdgId(part.pdgId());
    jet.setCharge(part.charge());
    merged->push_back(jet);
    hasTauAncValues.push_back(false);
  }

  auto newmerged = iEvent.put(std::move(merged), "merged");

  std::unique_ptr<edm::ValueMap<bool>> out(new edm::ValueMap<bool>());
  edm::ValueMap<bool>::Filler filler(*out);
  filler.insert(newmerged, hasTauAncValues.begin(), hasTauAncValues.end());
  filler.fill();

  iEvent.put(std::move(out), "hasTauAnc");
}

// ------------ method called once each stream before processing any runs, lumis or events  ------------
void GenJetGenPartMerger::beginStream(edm::StreamID) {}

// ------------ method called once each stream after processing all runs, lumis and events  ------------
void GenJetGenPartMerger::endStream() {}

//define this as a plug-in
DEFINE_FWK_MODULE(GenJetGenPartMerger);