GenericSimClusterMapper.cc

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#include "DataFormats/ForwardDetId/interface/HGCalDetId.h"
#include "DataFormats/ParticleFlowReco/interface/PFRecHitFraction.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "RecoParticleFlow/PFClusterProducer/interface/InitialClusteringStepBase.h"
#include "SimDataFormats/CaloAnalysis/interface/SimCluster.h"
#include "SimDataFormats/CaloAnalysis/interface/SimClusterFwd.h"

class GenericSimClusterMapper : public InitialClusteringStepBase {
  typedef GenericSimClusterMapper B2DGT;

public:
  GenericSimClusterMapper(const edm::ParameterSet& conf, edm::ConsumesCollector& cc)
      : InitialClusteringStepBase(conf, cc) {
    _simClusterToken = cc.consumes<SimClusterCollection>(conf.getParameter<edm::InputTag>("simClusterSrc"));
  }
  ~GenericSimClusterMapper() override = default;
  GenericSimClusterMapper(const B2DGT&) = delete;
  B2DGT& operator=(const B2DGT&) = delete;

  void updateEvent(const edm::Event&) final;

  void buildClusters(const edm::Handle<reco::PFRecHitCollection>&,
                     const std::vector<bool>&,
                     const std::vector<bool>&,
                     reco::PFClusterCollection&) override;

private:
  edm::EDGetTokenT<SimClusterCollection> _simClusterToken;
  edm::Handle<SimClusterCollection> _simClusterH;
};

DEFINE_EDM_PLUGIN(InitialClusteringStepFactory, GenericSimClusterMapper, "GenericSimClusterMapper");

#ifdef PFLOW_DEBUG
#define LOGVERB(x) edm::LogVerbatim(x)
#define LOGWARN(x) edm::LogWarning(x)
#define LOGERR(x) edm::LogError(x)
#define LOGDRESSED(x) edm::LogInfo(x)
#else
#define LOGVERB(x) LogTrace(x)
#define LOGWARN(x) edm::LogWarning(x)
#define LOGERR(x) edm::LogError(x)
#define LOGDRESSED(x) LogDebug(x)
#endif

void GenericSimClusterMapper::updateEvent(const edm::Event& ev) { ev.getByToken(_simClusterToken, _simClusterH); }

void GenericSimClusterMapper::buildClusters(const edm::Handle<reco::PFRecHitCollection>& input,
                                            const std::vector<bool>& rechitMask,
                                            const std::vector<bool>& seedable,
                                            reco::PFClusterCollection& output) {
  const SimClusterCollection& simClusters = *_simClusterH;
  auto const& hits = *input;

  // for quick indexing back to hit energy
  std::unordered_map<uint32_t, size_t> detIdToIndex(hits.size());
  for (uint32_t i = 0; i < hits.size(); ++i) {
    detIdToIndex[hits[i].detId()] = i;
    auto ref = makeRefhit(input, i);
  }

  for (const auto& sc : simClusters) {
    output.emplace_back();
    reco::PFCluster& back = output.back();
    edm::Ref<std::vector<reco::PFRecHit> > seed;
    double energy = 0.0, highest_energy = 0.0;
    auto hitsAndFractions = sc.hits_and_fractions();
    for (const auto& hAndF : hitsAndFractions) {
      auto itr = detIdToIndex.find(hAndF.first);
      if (itr == detIdToIndex.end())
        continue;  // hit wasn't saved in reco
      auto ref = makeRefhit(input, itr->second);
      const double hit_energy = hAndF.second * ref->energy();
      energy += hit_energy;
      back.addRecHitFraction(reco::PFRecHitFraction(ref, hAndF.second));
      if (hit_energy > highest_energy || highest_energy == 0.0) {
        highest_energy = hit_energy;
        seed = ref;
      }
    }
    if (!back.hitsAndFractions().empty()) {
      back.setSeed(seed->detId());
      back.setEnergy(energy);
      back.setCorrectedEnergy(energy);
    } else {
      back.setSeed(-1);
      back.setEnergy(0.f);
    }
  }
}