ME0ReDigiProducer.cc

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#ifndef SimMuon_GEMDigitizer_ME0ReDigiProducer_h
#define SimMuon_GEMDigitizer_ME0ReDigiProducer_h

/*
 * This module smears and discretizes the timing and position of the
 * ME0 pseudo digis.
 */

#include "FWCore/Framework/interface/stream/EDProducer.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/ConsumesCollector.h"
#include "FWCore/ServiceRegistry/interface/Service.h"
#include "FWCore/Utilities/interface/RandomNumberGenerator.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/Utilities/interface/Exception.h"

#include "DataFormats/GEMDigi/interface/ME0DigiPreRecoCollection.h"
#include "DataFormats/Common/interface/Handle.h"

#include "Geometry/CommonTopologies/interface/TrapezoidalStripTopology.h"
#include "Geometry/Records/interface/MuonGeometryRecord.h"
#include "Geometry/GEMGeometry/interface/ME0Geometry.h"
#include "Geometry/GEMGeometry/interface/ME0EtaPartitionSpecs.h"

#include "CLHEP/Random/RandGaussQ.h"
#include "CLHEP/Random/RandFlat.h"
#include "CLHEP/Units/PhysicalConstants.h"

#include <sstream>
#include <string>
#include <map>
#include <vector>

typedef class Point3DBase<float, LocalTag> LocalPoint;

class ME0ReDigiProducer : public edm::stream::EDProducer<> {
private:
  //Class used to define custom geometry, if required
  //assume that all ME0 chambers have the same dimension
  //and for the same layer have the same radial and Z position
  //Good for now, can build in support for more varied geos later
  //if necessary
  class TemporaryGeometry {
  public:
    TemporaryGeometry(const ME0Geometry* geometry,
                      const unsigned int numberOfStrips,
                      const unsigned int numberOfPartitions);
    ~TemporaryGeometry();
    unsigned int findEtaPartition(float locY) const;
    const TrapezoidalStripTopology* getTopo(const unsigned int partIdx) const { return stripTopos[partIdx]; }
    float getPartCenter(const unsigned int partIdx) const;  //position of part. in chamber
    float getCentralTOF(const ME0DetId& me0Id, unsigned int partIdx) const {
      return tofs[me0Id.layer() - 1][partIdx];
    }  //in detId layer numbers stat at 1
    unsigned int numLayers() const { return tofs.size(); }

  private:
    TrapezoidalStripTopology* buildTopo(const std::vector<float>& _p) const;

  private:
    float middleDistanceFromBeam;                       // radiusOfMainPartitionInCenter;
    std::vector<TrapezoidalStripTopology*> stripTopos;  // vector of Topos, one for each part
    std::vector<std::vector<double>> tofs;              //TOF to center of the partition:  [layer][part]
    std::vector<float> partitionTops;                   //Top of each partition in the chamber's local coords
  };

public:
  explicit ME0ReDigiProducer(const edm::ParameterSet& ps);

  ~ME0ReDigiProducer() override;

  void beginRun(const edm::Run&, const edm::EventSetup&) override;

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

  void buildDigis(const ME0DigiPreRecoCollection&,
                  ME0DigiPreRecoCollection&,
                  ME0DigiPreRecoMap&,
                  CLHEP::HepRandomEngine* engine);

private:
  void fillCentralTOFs();
  void getStripProperties(const ME0EtaPartition* etaPart,
                          const ME0DigiPreReco* inDigi,
                          float& tof,
                          int& strip,
                          LocalPoint& digiLocalPoint,
                          LocalError& digiLocalError) const;
  int getCustomStripProperties(const ME0DetId& detId,
                               const ME0DigiPreReco* inDigi,
                               float& tof,
                               int& strip,
                               LocalPoint& digiLocalPoint,
                               LocalError& digiLocalError) const;

  typedef std::tuple<unsigned int, unsigned int, unsigned int> DigiIndicies;
  typedef std::map<DigiIndicies, unsigned int> ChamberDigiMap;
  //fills map...returns -1 if digi is not already in the map
  unsigned int fillDigiMap(
      ChamberDigiMap& chDigiMap, unsigned int bx, unsigned int part, unsigned int strip, unsigned int currentIDX) const;

  //paramters
  const float bxWidth;              // ns
  bool useCusGeoFor1PartGeo;        //Use custom strips and partitions for digitization for single partition geometry
  bool usePads;                     //sets strip granularity to x2 coarser
  unsigned int numberOfStrips;      // Custom number of strips per partition
  unsigned int numberOfPartitions;  // Custom number of partitions per chamber
  double neutronAcceptance;         // fraction of neutron events to keep in event (>= 1 means no filtering)
  double timeResolution;            // smear time by gaussian with this sigma (in ns)....negative for no smearing
  int minBXReadout;                 // Minimum BX to readout
  int maxBXReadout;                 // Maximum BX to readout
  std::vector<int> layerReadout;  // Don't readout layer if entry is 0 (Layer number 1 in the numbering scheme is idx 0)
  bool mergeDigis;                // Keep only one digi at the same chamber, strip, partition, and BX
  edm::EDGetTokenT<ME0DigiPreRecoCollection> token;

  bool useBuiltinGeo;
  const ME0Geometry* geometry;
  TemporaryGeometry* tempGeo;
  std::vector<std::vector<double>> tofs;  //used for built in geo
};

ME0ReDigiProducer::TemporaryGeometry::TemporaryGeometry(const ME0Geometry* geometry,
                                                        const unsigned int numberOfStrips,
                                                        const unsigned int numberOfPartitions) {
  //First test geometry to make sure that it is compatible with our assumptions
  const auto& chambers = geometry->chambers();
  if (chambers.empty())
    throw cms::Exception("Setup")
        << "ME0ReDigiProducer::TemporaryGeometry::TemporaryGeometry() - No ME0Chambers in geometry.";
  const auto* mainChamber = chambers.front();
  const unsigned int nLayers = chambers.front()->nLayers();
  if (!nLayers)
    throw cms::Exception("Setup")
        << "ME0ReDigiProducer::TemporaryGeometry::TemporaryGeometry() - ME0Chamber has no layers.";
  const auto* mainLayer = mainChamber->layers()[0];
  if (!mainLayer->nEtaPartitions())
    throw cms::Exception("Setup")
        << "ME0ReDigiProducer::TemporaryGeometry::TemporaryGeometry() - ME0Layer has no partitions.";
  if (mainLayer->nEtaPartitions() != 1)
    throw cms::Exception("Setup") << "ME0ReDigiProducer::TemporaryGeometry::TemporaryGeometry() - This module is only "
                                     "compatitble with geometries that contain only one partition per ME0Layer.";

  const auto* mainPartition = mainLayer->etaPartitions()[0];
  const TrapezoidalStripTopology* mainTopo = dynamic_cast<const TrapezoidalStripTopology*>(&mainPartition->topology());
  if (!mainTopo)
    throw cms::Exception("Setup") << "ME0ReDigiProducer::TemporaryGeometry::TemporaryGeometry() - ME0 strip topology "
                                     "must be of type TrapezoidalStripTopology. This module cannot be used";

  for (const auto& chamber : geometry->chambers()) {
    if (chamber->nLayers() != int(nLayers))
      throw cms::Exception("Setup") << "ME0ReDigiProducer::TemporaryGeometry::TemporaryGeometry() - Not all "
                                       "ME0Chambers have the same number of layers. This module cannot be used.";
    for (unsigned int iL = 0; iL < nLayers; ++iL) {
      if (chamber->layers()[iL]->nEtaPartitions() != mainLayer->nEtaPartitions())
        throw cms::Exception("Setup") << "ME0ReDigiProducer::TemporaryGeometry::TemporaryGeometry() - Not all "
                                         "ME0Layers have the same number of partitions. This module cannot be used.";
      if (chamber->layers()[iL]->etaPartitions()[0]->specs()->parameters() != mainPartition->specs()->parameters())
        throw cms::Exception("Setup") << "ME0ReDigiProducer::TemporaryGeometry::TemporaryGeometry() - Not all ME0 ETA "
                                         "partitions have the same properties. This module cannot be used.";
      if (std::fabs(chamber->layers()[iL]->etaPartitions()[0]->position().z()) !=
          std::fabs(mainChamber->layers()[iL]->etaPartitions()[0]->position().z()))
        throw cms::Exception("Setup")
            << "ME0ReDigiProducer::TemporaryGeometry::TemporaryGeometry() - Not all ME0 ETA partitions in a single "
               "layer have the same Z position. This module cannot be used.";
    }
  }

  //Calculate radius to center of partition
  middleDistanceFromBeam = mainTopo->radius();

  //calculate the top of each eta partition, assuming equal distance in eta between partitions
  const auto localTop = LocalPoint(0, mainTopo->stripLength() / 2);
  const auto localBottom = LocalPoint(0, -1 * mainTopo->stripLength() / 2);
  const auto globalTop = mainPartition->toGlobal(localTop);
  const auto globalBottom = mainPartition->toGlobal(localBottom);
  const double etaTop = globalTop.eta();
  const double etaBottom = globalBottom.eta();
  const double zBottom = globalBottom.z();

  //Build topologies
  partitionTops.reserve(numberOfPartitions);
  stripTopos.reserve(numberOfPartitions);
  const auto& mainPars = mainPartition->specs()->parameters();
  for (unsigned int iP = 0; iP < numberOfPartitions; ++iP) {
    const double eta = (etaTop - etaBottom) * double(iP + 1) / double(numberOfPartitions) + etaBottom;
    const double distFromBeam = std::fabs(zBottom / std::sinh(eta));
    partitionTops.push_back(distFromBeam - middleDistanceFromBeam);
    LogDebug("ME0ReDigiProducer::TemporaryGeometry") << "Top of new partition: " << partitionTops.back() << std::endl;

    std::vector<float> params(4, 0);

    //half width of trapezoid at local coordinate Y
    auto getWidth = [&](float locY) -> float {
      return (mainPars[2] * (mainPars[1] + mainPars[0]) + locY * (mainPars[1] - mainPars[0])) / (2 * mainPars[2]);
    };

    params[0] = iP == 0 ? mainPars[0] : getWidth(partitionTops[iP - 1]);  // Half width of bottom of chamber
    params[1] =
        iP + 1 == numberOfPartitions ? mainPars[1] : getWidth(partitionTops[iP]);  // Half width of top of chamber
    params[2] = ((iP + 1 == numberOfPartitions ? localTop.y() : partitionTops[iP]) -
                 (iP == 0 ? localBottom.y() : partitionTops[iP - 1])) /
                2;  // Half width of height of chamber
    params[3] = numberOfStrips;

    stripTopos.push_back(buildTopo(params));
  }

  //Get TOF at center of each partition
  tofs.resize(nLayers);
  LogDebug("ME0ReDigiProducer::TemporaryGeometry") << "TOF numbers [layer][partition]: ";
  for (unsigned int iL = 0; iL < nLayers; ++iL) {
    tofs[iL].resize(numberOfPartitions);
    for (unsigned int iP = 0; iP < numberOfPartitions; ++iP) {
      const LocalPoint partCenter(0., getPartCenter(iP), 0.);
      const GlobalPoint centralGP(mainChamber->layers()[iL]->etaPartitions()[0]->toGlobal(partCenter));
      tofs[iL][iP] = (centralGP.mag() / (CLHEP::c_light / CLHEP::cm));  //speed of light [cm/ns]
      LogDebug("ME0ReDigiProducer::TemporaryGeometry")
          << "[" << iL << "][" << iP << "]=" << tofs[iL][iP] << " " << std::endl;
    }
  }
}

unsigned int ME0ReDigiProducer::TemporaryGeometry::findEtaPartition(float locY) const {
  unsigned int etaPart = stripTopos.size() - 1;
  for (unsigned int iP = 0; iP < stripTopos.size(); ++iP) {
    if (locY < partitionTops[iP]) {
      etaPart = iP;
      break;
    }
  }
  return etaPart;
}

float ME0ReDigiProducer::TemporaryGeometry::getPartCenter(const unsigned int partIdx) const {
  return stripTopos[partIdx]->radius() - middleDistanceFromBeam;
}

ME0ReDigiProducer::TemporaryGeometry::~TemporaryGeometry() {
  for (auto* p : stripTopos) {
    delete p;
  }
}

TrapezoidalStripTopology* ME0ReDigiProducer::TemporaryGeometry::buildTopo(const std::vector<float>& _p) const {
  float b = _p[0];
  float B = _p[1];
  float h = _p[2];
  float r0 = h * (B + b) / (B - b);
  float striplength = h * 2;
  float strips = _p[3];
  float pitch = (b + B) / strips;
  int nstrip = static_cast<int>(strips);

  LogDebug("ME0ReDigiProducer::TemporaryGeometry")
      << "New partition parameters: "
      << "bottom width(" << 2 * b << ") top width(" << 2 * B << ") height(" << 2 * h << ") radius to center(" << r0
      << ") nStrips(" << strips << ") pitch(" << pitch << ")" << std::endl;

  return new TrapezoidalStripTopology(nstrip, pitch, striplength, r0);
}

ME0ReDigiProducer::ME0ReDigiProducer(const edm::ParameterSet& ps)
    : bxWidth(25.0),
      useCusGeoFor1PartGeo(ps.getParameter<bool>("useCusGeoFor1PartGeo")),
      usePads(ps.getParameter<bool>("usePads")),
      numberOfStrips(ps.getParameter<unsigned int>("numberOfStrips")),
      numberOfPartitions(ps.getParameter<unsigned int>("numberOfPartitions")),
      neutronAcceptance(ps.getParameter<double>("neutronAcceptance")),
      timeResolution(ps.getParameter<double>("timeResolution")),
      minBXReadout(ps.getParameter<int>("minBXReadout")),
      maxBXReadout(ps.getParameter<int>("maxBXReadout")),
      layerReadout(ps.getParameter<std::vector<int>>("layerReadout")),
      mergeDigis(ps.getParameter<bool>("mergeDigis")),
      token(consumes<ME0DigiPreRecoCollection>(edm::InputTag(ps.getParameter<std::string>("inputCollection")))) {
  produces<ME0DigiPreRecoCollection>();
  produces<ME0DigiPreRecoMap>();

  edm::Service<edm::RandomNumberGenerator> rng;
  if (!rng.isAvailable()) {
    throw cms::Exception("Configuration")
        << "ME0ReDigiProducer::ME0PreRecoDigiProducer() - RandomNumberGeneratorService is not present in configuration "
           "file.\n"
        << "Add the service in the configuration file or remove the modules that require it.";
  }
  geometry = nullptr;
  tempGeo = nullptr;
  useBuiltinGeo = true;

  if (useCusGeoFor1PartGeo) {
    if (usePads)
      numberOfStrips = numberOfStrips / 2;
    if (numberOfStrips == 0)
      throw cms::Exception("Setup")
          << "ME0ReDigiProducer::ME0PreRecoDigiProducer() - Must have at least one strip if using custom geometry.";
    if (numberOfPartitions == 0)
      throw cms::Exception("Setup")
          << "ME0ReDigiProducer::ME0PreRecoDigiProducer() - Must have at least one partition if using custom geometry.";
  }

  if (neutronAcceptance < 0)
    throw cms::Exception("Setup") << "ME0ReDigiProducer::ME0PreRecoDigiProducer() - neutronAcceptance must be >= 0.";
}

ME0ReDigiProducer::~ME0ReDigiProducer() {
  if (tempGeo)
    delete tempGeo;
}

void ME0ReDigiProducer::beginRun(const edm::Run&, const edm::EventSetup& eventSetup) {
  // set geometry
  edm::ESHandle<ME0Geometry> hGeom;
  eventSetup.get<MuonGeometryRecord>().get(hGeom);
  geometry = &*hGeom;

  const auto& chambers = geometry->chambers();
  if (chambers.empty())
    throw cms::Exception("Setup") << "ME0ReDigiProducer::beginRun() - No ME0Chambers in geometry.";

  const unsigned int nLayers = chambers.front()->nLayers();
  if (!nLayers)
    throw cms::Exception("Setup") << "ME0ReDigiProducer::beginRun() - No layers in ME0 geometry.";

  const unsigned int nPartitions = chambers.front()->layers()[0]->nEtaPartitions();

  if (useCusGeoFor1PartGeo && nPartitions == 1) {
    useBuiltinGeo = false;
  }

  if (useBuiltinGeo) {
    if (nLayers != layerReadout.size())
      throw cms::Exception("Configuration")
          << "ME0ReDigiProducer::beginRun() - The geometry has " << nLayers << " layers, but the readout of "
          << layerReadout.size() << " were specified with the layerReadout parameter.";
    fillCentralTOFs();
  } else {
    LogDebug("ME0ReDigiProducer") << "Building temporary geometry:" << std::endl;
    tempGeo = new TemporaryGeometry(geometry, numberOfStrips, numberOfPartitions);
    LogDebug("ME0ReDigiProducer") << "Done building temporary geometry!" << std::endl;

    if (tempGeo->numLayers() != layerReadout.size())
      throw cms::Exception("Configuration")
          << "ME0ReDigiProducer::beginRun() - The geometry has " << tempGeo->numLayers()
          << " layers, but the readout of " << layerReadout.size()
          << " were specified with the layerReadout parameter.";
  }
}

void ME0ReDigiProducer::produce(edm::Event& e, const edm::EventSetup& eventSetup) {
  edm::Service<edm::RandomNumberGenerator> rng;
  CLHEP::HepRandomEngine* engine = &rng->getEngine(e.streamID());

  edm::Handle<ME0DigiPreRecoCollection> input_digis;
  e.getByToken(token, input_digis);

  std::unique_ptr<ME0DigiPreRecoCollection> output_digis(new ME0DigiPreRecoCollection());
  std::unique_ptr<ME0DigiPreRecoMap> output_digimap(new ME0DigiPreRecoMap());

  // build the digis
  buildDigis(*(input_digis.product()), *output_digis, *output_digimap, engine);

  // store them in the event
  e.put(std::move(output_digis));
  e.put(std::move(output_digimap));
}

void ME0ReDigiProducer::buildDigis(const ME0DigiPreRecoCollection& input_digis,
                                   ME0DigiPreRecoCollection& output_digis,
                                   ME0DigiPreRecoMap& output_digimap,
                                   CLHEP::HepRandomEngine* engine) {
  /*
      Starting form the incoming pseudo-digi, which has perfect time and position resolution:
      1A. Smear time using sigma_t by some value
      1B. Correct the smeared time with the central arrival time for partition
      1C. Apply discretization: if the smeared time is outside the BX window (-12.5ns;+12.5ns),
      the hit should be assigned to the next (or previous) BX

      2A. Find strip that the digi belongs to
      2B. Get the center of this strip and the error on the position assuming the geometry

      3A. Filter event if a digi at this partition/strip/BX already exists
      3B. Add to collection
    */

  LogDebug("ME0ReDigiProducer::buildDigis") << "Begin building digis." << std::endl;
  ME0DigiPreRecoCollection::DigiRangeIterator me0dgIt;
  for (me0dgIt = input_digis.begin(); me0dgIt != input_digis.end(); ++me0dgIt) {
    const auto& me0Id = (*me0dgIt).first;
    LogTrace("ME0ReDigiProducer::buildDigis") << "Starting with roll: " << me0Id << std::endl;

    //setup map for this chamber/eta partition
    ChamberDigiMap chDigiMap;

    int newDigiIdx = 0;
    const ME0DigiPreRecoCollection::Range& range = (*me0dgIt).second;
    for (ME0DigiPreRecoCollection::const_iterator digi = range.first; digi != range.second; digi++) {
      LogTrace("ME0ReDigiProducer::buildDigis") << std::endl
                                                << "(" << digi->x() << "," << digi->y() << "," << digi->tof() << ","
                                                << digi->pdgid() << "," << digi->prompt() << ")-> ";

      //If we don't readout this layer skip
      if (!layerReadout[me0Id.layer() - 1]) {
        output_digimap.insertDigi(me0Id, -1);
        continue;
      }

      //if neutron and we are filtering skip
      if (!digi->prompt() && neutronAcceptance < 1.0)
        if (CLHEP::RandFlat::shoot(engine) > neutronAcceptance) {
          output_digimap.insertDigi(me0Id, -1);
          continue;
        }

      //smear TOF if necessary
      float tof = digi->tof() + (timeResolution < 0 ? 0.0 : CLHEP::RandGaussQ::shoot(engine, 0, timeResolution));

      //Values used to fill objet
      int mapPartIDX = me0Id.roll() - 1;
      int strip = 0;
      LocalPoint digiLocalPoint;
      LocalError digiLocalError;
      if (useBuiltinGeo) {
        getStripProperties(geometry->etaPartition(me0Id), &*digi, tof, strip, digiLocalPoint, digiLocalError);
      } else {
        mapPartIDX = getCustomStripProperties(me0Id, &*digi, tof, strip, digiLocalPoint, digiLocalError);
      }

      //filter if outside of readout window
      const int bxIdx = std::round(tof / bxWidth);
      LogTrace("ME0ReDigiProducer::buildDigis") << tof << "(" << bxIdx << ") ";
      if (bxIdx < minBXReadout) {
        output_digimap.insertDigi(me0Id, -1);
        continue;
      }
      if (bxIdx > maxBXReadout) {
        output_digimap.insertDigi(me0Id, -1);
        continue;
      }
      tof = bxIdx * bxWidth;

      //If we are merging check to see if it already exists
      LogTrace("ME0ReDigiProducer::buildDigis") << "(" << bxIdx << "," << mapPartIDX << "," << strip << ") ";
      if (mergeDigis) {
        int matchIDX = fillDigiMap(chDigiMap, bxIdx, mapPartIDX, strip, newDigiIdx);
        if (matchIDX >= 0) {
          output_digimap.insertDigi(me0Id, matchIDX);
          continue;
        }
      }

      //Digis store sigmaX,sigmaY, correlationCoef
      const float sigmaX = std::sqrt(digiLocalError.xx());
      const float sigmaY = std::sqrt(digiLocalError.yy());
      const float corrCoef = digiLocalError.xy() / (sigmaX * sigmaY);

      //Fill in the new collection
      ME0DigiPreReco out_digi(
          digiLocalPoint.x(), digiLocalPoint.y(), sigmaX, sigmaY, corrCoef, tof, digi->pdgid(), digi->prompt());
      output_digis.insertDigi(me0Id, out_digi);

      // store index of previous detid and digi
      output_digimap.insertDigi(me0Id, newDigiIdx);
      newDigiIdx++;

      LogTrace("ME0ReDigiProducer::buildDigis") << "(" << digiLocalPoint.x() << "," << digiLocalPoint.y() << ","
                                                << sigmaX << "," << sigmaY << "," << tof << ") ";
    }

    chDigiMap.clear();
  }
}

void ME0ReDigiProducer::fillCentralTOFs() {
  const auto* mainChamber = geometry->chambers().front();
  const unsigned int nLayers = mainChamber->nLayers();
  //Get TOF at center of each partition
  tofs.clear();
  tofs.resize(nLayers);
  LogDebug("ME0ReDigiProducer::fillCentralTOFs()") << "TOF numbers [layer][partition]: ";
  for (unsigned int iL = 0; iL < nLayers; ++iL) {
    const auto* layer = mainChamber->layers()[iL];
    const unsigned int mapLayIDX = layer->id().layer() - 1;
    const unsigned int nPartitions = layer->nEtaPartitions();
    if (!nPartitions)
      throw cms::Exception("Setup") << "ME0ReDigiProducer::fillCentralTOFs() - ME0Layer has no partitions.";
    tofs[mapLayIDX].resize(nPartitions);
    for (unsigned int iP = 0; iP < nPartitions; ++iP) {
      const unsigned int mapPartIDX = layer->etaPartitions()[iP]->id().roll() - 1;
      const GlobalPoint centralGP(layer->etaPartitions()[iP]->position());
      tofs[mapLayIDX][mapPartIDX] = (centralGP.mag() / (CLHEP::c_light / CLHEP::cm));  //speed of light [cm/ns]
      LogDebug("ME0ReDigiProducer::fillCentralTOFs()")
          << "[" << mapLayIDX << "][" << mapPartIDX << "]=" << tofs[mapLayIDX][mapPartIDX] << " " << std::endl;
    }
  }
}
int ME0ReDigiProducer::getCustomStripProperties(const ME0DetId& detId,
                                                const ME0DigiPreReco* inDigi,
                                                float& tof,
                                                int& strip,
                                                LocalPoint& digiLocalPoint,
                                                LocalError& digiLocalError) const {
  const unsigned int partIdx = tempGeo->findEtaPartition(inDigi->y());
  LogTrace("ME0ReDigiProducer::buildDigis") << partIdx << " ";
  const float partMeanTof = tempGeo->getCentralTOF(detId, partIdx);

  //convert to relative to partition
  tof -= partMeanTof;

  //get coordinates and errors
  const float partCenter = tempGeo->getPartCenter(partIdx);
  const auto* topo = tempGeo->getTopo(partIdx);

  //find channel
  const LocalPoint partLocalPoint(inDigi->x(), inDigi->y() - partCenter, 0.);
  strip = topo->channel(partLocalPoint);
  const float stripF = float(strip) + 0.5;

  //get digitized location
  LocalPoint digiPartLocalPoint = topo->localPosition(stripF);
  digiLocalError = topo->localError(
      stripF,
      1. /
          sqrt(
              12.));  //std dev. flat distribution with length L is L/sqrt(12). The strip topology expects the error in units of strips.
  digiLocalPoint = LocalPoint(digiPartLocalPoint.x(), digiPartLocalPoint.y() + partCenter, 0.0);
  return partIdx;
}
void ME0ReDigiProducer::getStripProperties(const ME0EtaPartition* etaPart,
                                           const ME0DigiPreReco* inDigi,
                                           float& tof,
                                           int& strip,
                                           LocalPoint& digiLocalPoint,
                                           LocalError& digiLocalError) const {
  //convert to relative to partition
  tof -= tofs[etaPart->id().layer() - 1][etaPart->id().roll() - 1];

  const TrapezoidalStripTopology* origTopo = (const TrapezoidalStripTopology*)(&etaPart->specificTopology());
  TrapezoidalStripTopology padTopo(
      origTopo->nstrips() / 2, origTopo->pitch() * 2, origTopo->stripLength(), origTopo->radius());
  const auto& topo = usePads ? padTopo : etaPart->specificTopology();

  //find channel
  const LocalPoint partLocalPoint(inDigi->x(), inDigi->y(), 0.);
  strip = topo.channel(partLocalPoint);
  const float stripF = float(strip) + 0.5;

  //get digitized location
  digiLocalPoint = topo.localPosition(stripF);
  digiLocalError = topo.localError(stripF, 1. / sqrt(12.));
}

unsigned int ME0ReDigiProducer::fillDigiMap(
    ChamberDigiMap& chDigiMap, unsigned int bx, unsigned int part, unsigned int strip, unsigned int currentIDX) const {
  DigiIndicies newIDX(bx, part, strip);
  auto it1 = chDigiMap.find(newIDX);
  if (it1 == chDigiMap.end()) {
    chDigiMap[newIDX] = currentIDX;
    return -1;
  }
  return it1->second;
}

DEFINE_FWK_MODULE(ME0ReDigiProducer);
#endif