TrajectorySeedProducer.cc

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// system
#include <memory>
#include <vector>
#include <string>

// framework
#include "FWCore/Framework/interface/stream/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/ConsumesCollector.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"

// data formats
#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/Common/interface/OwnVector.h"
#include "DataFormats/TrackerRecHit2D/interface/FastTrackerRecHitCollection.h"
#include "DataFormats/TrajectorySeed/interface/TrajectorySeedCollection.h"

// reco track classes
#include "RecoTracker/TkTrackingRegions/interface/TrackingRegion.h"
#include "RecoTracker/TkSeedingLayers/interface/SeedingHitSet.h"
#include "RecoTracker/TkSeedGenerator/interface/SeedCreator.h"
#include "RecoTracker/TkSeedGenerator/interface/SeedCreatorFactory.h"

// geometry
#include "Geometry/Records/interface/TrackerTopologyRcd.h"

// fastsim
#include "FastSimulation/Tracking/interface/SeedingTree.h"
#include "FastSimulation/Tracking/interface/TrackingLayer.h"
#include "FastSimulation/Tracking/interface/FastTrackingUtilities.h"
#include "FastSimulation/Tracking/interface/SeedFinder.h"
#include "FastSimulation/Tracking/interface/SeedFinderSelector.h"

class MeasurementTracker;

class TrajectorySeedProducer : public edm::stream::EDProducer<> {
private:
  // tokens

  edm::EDGetTokenT<FastTrackerRecHitCombinationCollection> recHitCombinationsToken;
  edm::EDGetTokenT<std::vector<bool>> hitMasksToken;
  edm::EDGetTokenT<std::vector<std::unique_ptr<TrackingRegion>>> trackingRegionToken;
  const edm::ESGetToken<TrackerTopology, TrackerTopologyRcd> trackerTopologyESToken_;

  // other data members
  unsigned int nHitsPerSeed_;

  std::vector<std::vector<TrackingLayer>> seedingLayers;
  SeedingTree<TrackingLayer> _seedingTree;

  std::unique_ptr<SeedCreator> seedCreator;
  std::string measurementTrackerLabel;

  std::unique_ptr<SeedFinderSelector> seedFinderSelector;

public:
  TrajectorySeedProducer(const edm::ParameterSet& conf);

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

template class SeedingTree<TrackingLayer>;
template class SeedingNode<TrackingLayer>;

TrajectorySeedProducer::TrajectorySeedProducer(const edm::ParameterSet& conf) : trackerTopologyESToken_(esConsumes()) {
  // products
  produces<TrajectorySeedCollection>();

  // consumes
  recHitCombinationsToken =
      consumes<FastTrackerRecHitCombinationCollection>(conf.getParameter<edm::InputTag>("recHitCombinations"));
  if (conf.exists("hitMasks")) {
    hitMasksToken = consumes<std::vector<bool>>(conf.getParameter<edm::InputTag>("hitMasks"));
  }

  // read Layers
  std::vector<std::string> layerStringList =
      conf.getParameter<edm::ParameterSet>("seedFinderSelector").getParameter<std::vector<std::string>>("layerList");
  std::string layerBegin = *(layerStringList.cbegin());
  nHitsPerSeed_ = 0;
  for (auto it = layerStringList.cbegin(); it < layerStringList.cend(); ++it) {
    std::vector<TrackingLayer> trackingLayerList;
    std::string line = *it;
    std::string::size_type pos = 0;
    unsigned int nHitsPerSeed = 0;
    while (pos != std::string::npos) {
      pos = line.find('+');
      std::string layer = line.substr(0, pos);
      TrackingLayer layerSpec = TrackingLayer::createFromString(layer);
      trackingLayerList.push_back(layerSpec);
      line = line.substr(pos + 1, std::string::npos);
      nHitsPerSeed++;
    }
    if (it == layerStringList.cbegin()) {
      nHitsPerSeed_ = nHitsPerSeed;
    } else if (nHitsPerSeed_ != nHitsPerSeed) {
      throw cms::Exception("FastSimTracking") << "All allowed seed layer definitions must have same elements";
    }
    _seedingTree.insert(trackingLayerList);
  }

  // seed finder selector
  if (conf.exists("seedFinderSelector")) {
    seedFinderSelector = std::make_unique<SeedFinderSelector>(
        conf.getParameter<edm::ParameterSet>("seedFinderSelector"), consumesCollector());
  }

  trackingRegionToken = consumes(conf.getParameter<edm::InputTag>("trackingRegions"));

  // seed creator
  const edm::ParameterSet& seedCreatorPSet = conf.getParameter<edm::ParameterSet>("SeedCreatorPSet");
  std::string seedCreatorName = seedCreatorPSet.getParameter<std::string>("ComponentName");
  seedCreator = SeedCreatorFactory::get()->create(seedCreatorName, seedCreatorPSet, consumesCollector());
}

void TrajectorySeedProducer::produce(edm::Event& e, const edm::EventSetup& es) {
  // services
  auto const& trackerTopology = es.getData(trackerTopologyESToken_);

  // input data
  edm::Handle<FastTrackerRecHitCombinationCollection> recHitCombinations;
  e.getByToken(recHitCombinationsToken, recHitCombinations);
  const std::vector<bool>* hitMasks = nullptr;
  if (!hitMasksToken.isUninitialized()) {
    edm::Handle<std::vector<bool>> hitMasksHandle;
    e.getByToken(hitMasksToken, hitMasksHandle);
    hitMasks = &(*hitMasksHandle);
  }

  // output data
  std::unique_ptr<TrajectorySeedCollection> output(new TrajectorySeedCollection());

  // read the regions;
  auto const& regions = e.get(trackingRegionToken);
  // and make sure there is at least one region
  if (regions.empty()) {
    e.put(std::move(output));
    return;
  }

  // instantiate the seed finder
  SeedFinder seedFinder(_seedingTree, trackerTopology);
  if (seedFinderSelector) {
    seedFinderSelector->initEvent(e, es);
    seedFinder.addHitSelector(seedFinderSelector.get(), nHitsPerSeed_);
  }

  // loop over the combinations
  for (unsigned icomb = 0; icomb < recHitCombinations->size(); ++icomb) {
    FastTrackerRecHitCombination recHitCombination = (*recHitCombinations)[icomb];

    // create a list of hits cleaned from masked hits
    std::vector<const FastTrackerRecHit*> seedHitCandidates;
    for (const auto& _hit : recHitCombination) {
      if (hitMasks && fastTrackingUtilities::hitIsMasked(_hit.get(), *hitMasks)) {
        continue;
      }
      seedHitCandidates.push_back(_hit.get());
    }

    // loop over the regions
    for (const auto& region : regions) {
      // set the region used in the selector
      if (seedFinderSelector) {
        seedFinderSelector->setTrackingRegion(region.get());
      }

      // find hits compatible with the seed requirements
      std::vector<unsigned int> seedHitNumbers = seedFinder.getSeed(seedHitCandidates);

      // create a seed from those hits
      if (seedHitNumbers.size() > 1) {
        // copy the hits
        edm::OwnVector<FastTrackerRecHit> seedHits;
        for (unsigned iIndex = 0; iIndex < seedHitNumbers.size(); ++iIndex) {
          seedHits.push_back(seedHitCandidates[seedHitNumbers[iIndex]]->clone());
        }
        // make them aware of the combination they originate from
        fastTrackingUtilities::setRecHitCombinationIndex(seedHits, icomb);

        // create the seed
        seedCreator->init(*region, es, nullptr);
        seedCreator->makeSeed(*output,
                              SeedingHitSet(&seedHits[0],
                                            &seedHits[1],
                                            seedHits.size() >= 3 ? &seedHits[2] : nullptr,
                                            seedHits.size() >= 4 ? &seedHits[3] : nullptr));
        break;  // break the loop over the regions
      }
    }
  }
  e.put(std::move(output));
}

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