PFClusterFromHGCalMultiCluster.cc

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#include "PFClusterFromHGCalMultiCluster.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
 
#include "FWCore/Framework/interface/Event.h"
 
#include "DataFormats/ForwardDetId/interface/HGCalDetId.h"
 
void PFClusterFromHGCalMultiCluster::updateEvent(const edm::Event& ev) {
  ev.getByToken(clusterToken_, clusterH_);
  ev.getByToken(tracksterToken_, trackstersH_);
}
 
void PFClusterFromHGCalMultiCluster::buildClusters(const edm::Handle<reco::PFRecHitCollection>& input,
                                                   const std::vector<bool>& rechitMask,
                                                   const std::vector<bool>& seedable,
                                                   reco::PFClusterCollection& output) {
  const auto& hgcalMultiClusters = *clusterH_;
  auto const& hits = *input;
 
  const auto& tracksters = *trackstersH_;
 
  // 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;
  }
 
  int iMultiClus = -1;
  for (const auto& mcl : hgcalMultiClusters) {
    iMultiClus++;
    // Skip empty multiclusters
    if (mcl.hitsAndFractions().empty()) {
      continue;
    }
    // Filter using trackster PID
    if (filterByTracksterPID_) {
      float probTotal = 0.0f;
      for (int cat : filter_on_categories_) {
        probTotal += tracksters[iMultiClus].id_probabilities(cat);
      }
      if (probTotal < pid_threshold_) {
        continue;
      }
    }
 
    DetId seed;
    double energy = 0.0, highest_energy = 0.0;
    output.emplace_back();
    reco::PFCluster& back = output.back();
    const auto& hitsAndFractions_mcl = mcl.hitsAndFractions();
 
    std::vector<std::pair<DetId, float> > hitsAndFractions;
    hitsAndFractions.insert(hitsAndFractions.end(), hitsAndFractions_mcl.begin(), hitsAndFractions_mcl.end());
 
    // Use the H&F of the clusters inside the multicluster if the latter's H&F are not stored
    if (hitsAndFractions.empty()) {
      for (const auto& cl : mcl) {
        const auto& hAndF_temp = cl->hitsAndFractions();
        hitsAndFractions.insert(hitsAndFractions.end(), hAndF_temp.begin(), hAndF_temp.end());
      }
    }
 
    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);
      assert(ref->detId() == hAndF.first.rawId());
      const double hit_energy = hAndF.second * ref->energy();
      energy += hit_energy;
      back.addRecHitFraction(reco::PFRecHitFraction(ref, hAndF.second));
      // TODO: the following logic to identify the seed of a cluster
      // could be appropriate for the Run2 Ecal Calorimetric
      // detector, but could be wrong for the HGCal one. This has to
      // be reviewd.
      if (hit_energy > highest_energy || highest_energy == 0.0) {
        highest_energy = hit_energy;
        seed = ref->detId();
      }
    }  // end of hitsAndFractions
 
    if (!back.hitsAndFractions().empty()) {
      back.setSeed(seed);
      back.setEnergy(energy);
      back.setCorrectedEnergy(energy);
    } else {
      back.setSeed(0);
      back.setEnergy(0.f);
    }
  }  // end of loop over hgcalMulticlusters (3D)
}