ReducedEGProducer.cc

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#include <iostream>
#include <vector>
#include <memory>
#include <unordered_set>

// Framework
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/Utilities/interface/Exception.h"

#include "CommonTools/Utils/interface/StringToEnumValue.h"

#include "Geometry/Records/interface/CaloGeometryRecord.h"
#include "Geometry/CaloGeometry/interface/CaloSubdetectorGeometry.h"
#include "Geometry/CaloTopology/interface/CaloTopology.h"
#include "Geometry/CaloEventSetup/interface/CaloTopologyRecord.h"

#include "DataFormats/VertexReco/interface/Vertex.h"
#include "DataFormats/VertexReco/interface/VertexFwd.h"
#include "DataFormats/EgammaReco/interface/ClusterShape.h"
#include "DataFormats/EgammaCandidates/interface/PhotonCore.h"
#include "DataFormats/EgammaCandidates/interface/Photon.h"
#include "DataFormats/EgammaCandidates/interface/PhotonFwd.h"
#include "DataFormats/EgammaCandidates/interface/Conversion.h"
#include "DataFormats/Common/interface/ValueMap.h"
#include "DataFormats/ParticleFlowCandidate/interface/PFCandidate.h"
#include "DataFormats/ParticleFlowCandidate/interface/PFCandidateEGammaExtra.h"
#include "DataFormats/ParticleFlowCandidate/interface/PFCandidateEGammaExtraFwd.h"
#include "DataFormats/HcalRecHit/interface/HcalRecHitCollections.h"

#include "DataFormats/EgammaReco/interface/ElectronSeed.h"
#include "RecoCaloTools/Selectors/interface/CaloConeSelector.h"

#include "RecoLocalCalo/EcalRecAlgos/interface/EcalSeverityLevelAlgoRcd.h"
#include "RecoLocalCalo/EcalRecAlgos/interface/EcalSeverityLevelAlgo.h"

#include "RecoEgamma/EgammaPhotonProducers/interface/ReducedEGProducer.h"
#include "RecoEgamma/EgammaIsolationAlgos/interface/EgammaTowerIsolation.h"

#include "RecoEgamma/EgammaIsolationAlgos/interface/EgammaHadTower.h"

#include "RecoEgamma/EgammaTools/interface/ConversionTools.h"

ReducedEGProducer::ReducedEGProducer(const edm::ParameterSet& config)
    : photonT_(consumes<reco::PhotonCollection>(config.getParameter<edm::InputTag>("photons"))),
      gsfElectronT_(consumes<reco::GsfElectronCollection>(config.getParameter<edm::InputTag>("gsfElectrons"))),
      gsfTrackT_(consumes<reco::GsfTrackCollection>(config.getParameter<edm::InputTag>("gsfTracks"))),
      conversionT_(consumes<reco::ConversionCollection>(config.getParameter<edm::InputTag>("conversions"))),
      singleConversionT_(consumes<reco::ConversionCollection>(config.getParameter<edm::InputTag>("singleConversions"))),
      barrelEcalHits_(consumes<EcalRecHitCollection>(config.getParameter<edm::InputTag>("barrelEcalHits"))),
      endcapEcalHits_(consumes<EcalRecHitCollection>(config.getParameter<edm::InputTag>("endcapEcalHits"))),
      doPreshowerEcalHits_(!config.getParameter<edm::InputTag>("preshowerEcalHits").label().empty()),
      preshowerEcalHits_(doPreshowerEcalHits_
                             ? consumes<EcalRecHitCollection>(config.getParameter<edm::InputTag>("preshowerEcalHits"))
                             : edm::EDGetTokenT<EcalRecHitCollection>()),
      hbheHits_(consumes<HBHERecHitCollection>(config.getParameter<edm::InputTag>("hbheHits"))),
      photonPfCandMapT_(consumes<edm::ValueMap<std::vector<reco::PFCandidateRef>>>(
          config.getParameter<edm::InputTag>("photonsPFValMap"))),
      gsfElectronPfCandMapT_(consumes<edm::ValueMap<std::vector<reco::PFCandidateRef>>>(
          config.getParameter<edm::InputTag>("gsfElectronsPFValMap"))),
      //calibration flags
      applyPhotonCalibOnData_(config.getParameter<bool>("applyPhotonCalibOnData")),
      applyPhotonCalibOnMC_(config.getParameter<bool>("applyPhotonCalibOnMC")),
      applyGsfElectronCalibOnData_(config.getParameter<bool>("applyGsfElectronCalibOnData")),
      applyGsfElectronCalibOnMC_(config.getParameter<bool>("applyGsfElectronCalibOnMC")),
      //output collections
      outPhotons_("reducedGedPhotons"),
      outPhotonCores_("reducedGedPhotonCores"),
      outOOTPhotons_("reducedOOTPhotons"),
      outOOTPhotonCores_("reducedOOTPhotonCores"),
      outGsfElectrons_("reducedGedGsfElectrons"),
      outGsfElectronCores_("reducedGedGsfElectronCores"),
      outGsfTracks_("reducedGsfTracks"),
      outConversions_("reducedConversions"),
      outSingleConversions_("reducedSingleLegConversions"),
      outSuperClusters_("reducedSuperClusters"),
      outEBEEClusters_("reducedEBEEClusters"),
      outESClusters_("reducedESClusters"),
      outOOTSuperClusters_("reducedOOTSuperClusters"),
      outOOTEBEEClusters_("reducedOOTEBEEClusters"),
      outOOTESClusters_("reducedOOTESClusters"),
      outEBRecHits_("reducedEBRecHits"),
      outEERecHits_("reducedEERecHits"),
      outESRecHits_("reducedESRecHits"),
      outHBHERecHits_("reducedHBHEHits"),
      outPhotonPfCandMap_("reducedPhotonPfCandMap"),
      outGsfElectronPfCandMap_("reducedGsfElectronPfCandMap"),
      outPhotonIds_(config.getParameter<std::vector<std::string>>("photonIDOutput")),
      outGsfElectronIds_(config.getParameter<std::vector<std::string>>("gsfElectronIDOutput")),
      outPhotonFloatValueMaps_(config.getParameter<std::vector<std::string>>("photonFloatValueMapOutput")),
      outOOTPhotonFloatValueMaps_(config.getParameter<std::vector<std::string>>("ootPhotonFloatValueMapOutput")),
      outGsfElectronFloatValueMaps_(config.getParameter<std::vector<std::string>>("gsfElectronFloatValueMapOutput")),
      keepPhotonSel_(config.getParameter<std::string>("keepPhotons")),
      slimRelinkPhotonSel_(config.getParameter<std::string>("slimRelinkPhotons")),
      relinkPhotonSel_(config.getParameter<std::string>("relinkPhotons")),
      keepOOTPhotonSel_(config.getParameter<std::string>("keepOOTPhotons")),
      slimRelinkOOTPhotonSel_(config.getParameter<std::string>("slimRelinkOOTPhotons")),
      relinkOOTPhotonSel_(config.getParameter<std::string>("relinkOOTPhotons")),
      keepGsfElectronSel_(config.getParameter<std::string>("keepGsfElectrons")),
      slimRelinkGsfElectronSel_(config.getParameter<std::string>("slimRelinkGsfElectrons")),
      relinkGsfElectronSel_(config.getParameter<std::string>("relinkGsfElectrons")),
      hcalHitSel_(config.getParameter<edm::ParameterSet>("hcalHitSel")) {
  const edm::InputTag& aTag = config.getParameter<edm::InputTag>("ootPhotons");
  if (not aTag.label().empty())
    ootPhotonT_ = consumes<reco::PhotonCollection>(aTag);

  const std::vector<edm::InputTag>& photonidinputs = config.getParameter<std::vector<edm::InputTag>>("photonIDSources");
  for (const edm::InputTag& tag : photonidinputs) {
    photonIdTs_.emplace_back(consumes<edm::ValueMap<bool>>(tag));
  }

  const std::vector<edm::InputTag>& gsfelectronidinputs =
      config.getParameter<std::vector<edm::InputTag>>("gsfElectronIDSources");
  for (const edm::InputTag& tag : gsfelectronidinputs) {
    gsfElectronIdTs_.emplace_back(consumes<edm::ValueMap<float>>(tag));
  }

  const std::vector<edm::InputTag>& photonpfclusterisoinputs =
      config.getParameter<std::vector<edm::InputTag>>("photonFloatValueMapSources");
  for (const edm::InputTag& tag : photonpfclusterisoinputs) {
    photonFloatValueMapTs_.emplace_back(consumes<edm::ValueMap<float>>(tag));
  }

  const std::vector<edm::InputTag>& ootphotonpfclusterisoinputs =
      config.getParameter<std::vector<edm::InputTag>>("ootPhotonFloatValueMapSources");
  for (const edm::InputTag& tag : ootphotonpfclusterisoinputs) {
    ootPhotonFloatValueMapTs_.emplace_back(consumes<edm::ValueMap<float>>(tag));
  }

  const std::vector<edm::InputTag>& gsfelectronpfclusterisoinputs =
      config.getParameter<std::vector<edm::InputTag>>("gsfElectronFloatValueMapSources");
  for (const edm::InputTag& tag : gsfelectronpfclusterisoinputs) {
    gsfElectronFloatValueMapTs_.emplace_back(consumes<edm::ValueMap<float>>(tag));
  }

  if (applyPhotonCalibOnData_ || applyPhotonCalibOnMC_) {
    setToken(photonCalibEnergyT_, config, "photonCalibEnergySource");
    setToken(photonCalibEnergyErrT_, config, "photonCalibEnergyErrSource");
  }
  if (applyGsfElectronCalibOnData_ || applyGsfElectronCalibOnMC_) {
    setToken(gsfElectronCalibEnergyT_, config, "gsfElectronCalibEnergySource");
    setToken(gsfElectronCalibEnergyErrT_, config, "gsfElectronCalibEnergyErrSource");
    setToken(gsfElectronCalibEcalEnergyT_, config, "gsfElectronCalibEcalEnergySource");
    setToken(gsfElectronCalibEcalEnergyErrT_, config, "gsfElectronCalibEcalEnergyErrSource");
  }

  produces<reco::PhotonCollection>(outPhotons_);
  produces<reco::PhotonCoreCollection>(outPhotonCores_);
  if (!ootPhotonT_.isUninitialized()) {
    produces<reco::PhotonCollection>(outOOTPhotons_);
    produces<reco::PhotonCoreCollection>(outOOTPhotonCores_);
  }
  produces<reco::GsfElectronCollection>(outGsfElectrons_);
  produces<reco::GsfElectronCoreCollection>(outGsfElectronCores_);
  produces<reco::GsfTrackCollection>(outGsfTracks_);
  produces<reco::ConversionCollection>(outConversions_);
  produces<reco::ConversionCollection>(outSingleConversions_);
  produces<reco::SuperClusterCollection>(outSuperClusters_);
  produces<reco::CaloClusterCollection>(outEBEEClusters_);
  produces<reco::CaloClusterCollection>(outESClusters_);
  if (!ootPhotonT_.isUninitialized()) {
    produces<reco::SuperClusterCollection>(outOOTSuperClusters_);
    produces<reco::CaloClusterCollection>(outOOTEBEEClusters_);
    produces<reco::CaloClusterCollection>(outOOTESClusters_);
  }
  produces<EcalRecHitCollection>(outEBRecHits_);
  produces<EcalRecHitCollection>(outEERecHits_);
  if (doPreshowerEcalHits_)
    produces<EcalRecHitCollection>(outESRecHits_);
  produces<HBHERecHitCollection>(outHBHERecHits_);
  produces<edm::ValueMap<std::vector<reco::PFCandidateRef>>>(outPhotonPfCandMap_);
  produces<edm::ValueMap<std::vector<reco::PFCandidateRef>>>(outGsfElectronPfCandMap_);
  for (const std::string& outid : outPhotonIds_) {
    produces<edm::ValueMap<bool>>(outid);
  }
  for (const std::string& outid : outGsfElectronIds_) {
    produces<edm::ValueMap<float>>(outid);
  }
  for (const std::string& outid : outPhotonFloatValueMaps_) {
    produces<edm::ValueMap<float>>(outid);
  }
  if (!ootPhotonT_.isUninitialized()) {
    for (const std::string& outid : outOOTPhotonFloatValueMaps_) {
      produces<edm::ValueMap<float>>(outid);
    }
  }
  for (const std::string& outid : outGsfElectronFloatValueMaps_) {
    produces<edm::ValueMap<float>>(outid);
  }
}

ReducedEGProducer::~ReducedEGProducer() {}

void ReducedEGProducer::beginRun(edm::Run const& run, const edm::EventSetup& iSetup) { hcalHitSel_.setup(iSetup); }

void ReducedEGProducer::produce(edm::Event& theEvent, const edm::EventSetup& theEventSetup) {
  //get input collections

  edm::Handle<reco::PhotonCollection> photonHandle;
  theEvent.getByToken(photonT_, photonHandle);

  edm::Handle<reco::PhotonCollection> ootPhotonHandle;
  if (!ootPhotonT_.isUninitialized())
    theEvent.getByToken(ootPhotonT_, ootPhotonHandle);

  edm::Handle<reco::GsfElectronCollection> gsfElectronHandle;
  theEvent.getByToken(gsfElectronT_, gsfElectronHandle);

  edm::Handle<reco::GsfTrackCollection> gsfTrackHandle;
  theEvent.getByToken(gsfTrackT_, gsfTrackHandle);

  edm::Handle<reco::ConversionCollection> conversionHandle;
  theEvent.getByToken(conversionT_, conversionHandle);

  edm::Handle<reco::ConversionCollection> singleConversionHandle;
  theEvent.getByToken(singleConversionT_, singleConversionHandle);

  edm::Handle<EcalRecHitCollection> barrelHitHandle;
  theEvent.getByToken(barrelEcalHits_, barrelHitHandle);

  edm::Handle<EcalRecHitCollection> endcapHitHandle;
  theEvent.getByToken(endcapEcalHits_, endcapHitHandle);

  edm::Handle<EcalRecHitCollection> preshowerHitHandle;
  if (doPreshowerEcalHits_)
    theEvent.getByToken(preshowerEcalHits_, preshowerHitHandle);

  edm::Handle<HBHERecHitCollection> hbheHitHandle;
  theEvent.getByToken(hbheHits_, hbheHitHandle);

  edm::Handle<edm::ValueMap<std::vector<reco::PFCandidateRef>>> photonPfCandMapHandle;
  theEvent.getByToken(photonPfCandMapT_, photonPfCandMapHandle);

  edm::Handle<edm::ValueMap<std::vector<reco::PFCandidateRef>>> gsfElectronPfCandMapHandle;
  theEvent.getByToken(gsfElectronPfCandMapT_, gsfElectronPfCandMapHandle);

  std::vector<edm::Handle<edm::ValueMap<bool>>> photonIdHandles(photonIdTs_.size());
  int index = 0;  // universal index for range based loops
  for (const auto& photonIdT : photonIdTs_) {
    theEvent.getByToken(photonIdT, photonIdHandles[index++]);
  }

  std::vector<edm::Handle<edm::ValueMap<float>>> gsfElectronIdHandles(gsfElectronIdTs_.size());
  index = 0;
  for (const auto& gsfElectronIdT : gsfElectronIdTs_) {
    theEvent.getByToken(gsfElectronIdT, gsfElectronIdHandles[index++]);
  }

  std::vector<edm::Handle<edm::ValueMap<float>>> photonFloatValueMapHandles(photonFloatValueMapTs_.size());
  index = 0;
  for (const auto& photonFloatValueMapT : photonFloatValueMapTs_) {
    theEvent.getByToken(photonFloatValueMapT, photonFloatValueMapHandles[index++]);
  }

  std::vector<edm::Handle<edm::ValueMap<float>>> ootPhotonFloatValueMapHandles(ootPhotonFloatValueMapTs_.size());
  if (!ootPhotonT_.isUninitialized()) {
    index = 0;
    for (const auto& ootPhotonFloatValueMapT : ootPhotonFloatValueMapTs_) {
      theEvent.getByToken(ootPhotonFloatValueMapT, ootPhotonFloatValueMapHandles[index++]);
    }
  }

  std::vector<edm::Handle<edm::ValueMap<float>>> gsfElectronFloatValueMapHandles(gsfElectronFloatValueMapTs_.size());
  index = 0;
  for (const auto& gsfElectronFloatValueMapT : gsfElectronFloatValueMapTs_) {
    theEvent.getByToken(gsfElectronFloatValueMapT, gsfElectronFloatValueMapHandles[index++]);
  }

  edm::Handle<edm::ValueMap<float>> gsfElectronCalibEnergyHandle;
  edm::Handle<edm::ValueMap<float>> gsfElectronCalibEnergyErrHandle;
  edm::Handle<edm::ValueMap<float>> gsfElectronCalibEcalEnergyHandle;
  edm::Handle<edm::ValueMap<float>> gsfElectronCalibEcalEnergyErrHandle;
  if (applyGsfElectronCalibOnData_ || applyGsfElectronCalibOnMC_) {
    theEvent.getByToken(gsfElectronCalibEnergyT_, gsfElectronCalibEnergyHandle);
    theEvent.getByToken(gsfElectronCalibEnergyErrT_, gsfElectronCalibEnergyErrHandle);
    theEvent.getByToken(gsfElectronCalibEcalEnergyT_, gsfElectronCalibEcalEnergyHandle);
    theEvent.getByToken(gsfElectronCalibEcalEnergyErrT_, gsfElectronCalibEcalEnergyErrHandle);
  }
  edm::Handle<edm::ValueMap<float>> photonCalibEnergyHandle;
  edm::Handle<edm::ValueMap<float>> photonCalibEnergyErrHandle;
  if (applyPhotonCalibOnData_ || applyPhotonCalibOnMC_) {
    theEvent.getByToken(photonCalibEnergyT_, photonCalibEnergyHandle);
    theEvent.getByToken(photonCalibEnergyErrT_, photonCalibEnergyErrHandle);
  }

  edm::ESHandle<CaloTopology> theCaloTopology;
  theEventSetup.get<CaloTopologyRecord>().get(theCaloTopology);
  const CaloTopology* caloTopology = &(*theCaloTopology);

  //initialize output collections
  auto photons = std::make_unique<reco::PhotonCollection>();
  auto photonCores = std::make_unique<reco::PhotonCoreCollection>();
  auto ootPhotons = std::make_unique<reco::PhotonCollection>();
  auto ootPhotonCores = std::make_unique<reco::PhotonCoreCollection>();
  auto gsfElectrons = std::make_unique<reco::GsfElectronCollection>();
  auto gsfElectronCores = std::make_unique<reco::GsfElectronCoreCollection>();
  auto gsfTracks = std::make_unique<reco::GsfTrackCollection>();
  auto conversions = std::make_unique<reco::ConversionCollection>();
  auto singleConversions = std::make_unique<reco::ConversionCollection>();
  auto superClusters = std::make_unique<reco::SuperClusterCollection>();
  auto ebeeClusters = std::make_unique<reco::CaloClusterCollection>();
  auto esClusters = std::make_unique<reco::CaloClusterCollection>();
  auto ootSuperClusters = std::make_unique<reco::SuperClusterCollection>();
  auto ootEbeeClusters = std::make_unique<reco::CaloClusterCollection>();
  auto ootEsClusters = std::make_unique<reco::CaloClusterCollection>();
  auto ebRecHits = std::make_unique<EcalRecHitCollection>();
  auto eeRecHits = std::make_unique<EcalRecHitCollection>();
  auto esRecHits = std::make_unique<EcalRecHitCollection>();
  auto hbheRecHits = std::make_unique<HBHERecHitCollection>();
  auto photonPfCandMap = std::make_unique<edm::ValueMap<std::vector<reco::PFCandidateRef>>>();
  auto gsfElectronPfCandMap = std::make_unique<edm::ValueMap<std::vector<reco::PFCandidateRef>>>();

  //maps to collection indices of output objects
  std::map<reco::PhotonCoreRef, unsigned int> photonCoreMap;
  std::map<reco::PhotonCoreRef, unsigned int> ootPhotonCoreMap;
  std::map<reco::GsfElectronCoreRef, unsigned int> gsfElectronCoreMap;
  std::map<reco::GsfTrackRef, unsigned int> gsfTrackMap;
  std::map<reco::ConversionRef, unsigned int> conversionMap;
  std::map<reco::ConversionRef, unsigned int> singleConversionMap;
  std::map<reco::SuperClusterRef, unsigned int> superClusterMap;
  std::map<reco::CaloClusterPtr, unsigned int> ebeeClusterMap;
  std::map<reco::CaloClusterPtr, unsigned int> esClusterMap;
  std::map<reco::SuperClusterRef, unsigned int> ootSuperClusterMap;
  std::map<reco::CaloClusterPtr, unsigned int> ootEbeeClusterMap;
  std::map<reco::CaloClusterPtr, unsigned int> ootEsClusterMap;
  std::unordered_set<DetId> rechitMap;
  std::unordered_set<DetId> hcalRechitMap;

  std::unordered_set<unsigned int> superClusterFullRelinkMap;
  std::unordered_set<unsigned int> ootSuperClusterFullRelinkMap;

  //vectors for pfcandidate valuemaps
  std::vector<std::vector<reco::PFCandidateRef>> pfCandIsoPairVecPho;
  std::vector<std::vector<reco::PFCandidateRef>> pfCandIsoPairVecEle;

  //vectors for id valuemaps
  std::vector<std::vector<bool>> photonIdVals(photonIdHandles.size());
  std::vector<std::vector<float>> gsfElectronIdVals(gsfElectronIdHandles.size());
  std::vector<std::vector<float>> photonFloatValueMapVals(photonFloatValueMapHandles.size());
  std::vector<std::vector<float>> ootPhotonFloatValueMapVals(ootPhotonFloatValueMapHandles.size());
  std::vector<std::vector<float>> gsfElectronFloatValueMapVals(gsfElectronFloatValueMapHandles.size());

  //loop over photons and fill maps
  index = -1;
  for (const auto& photon : *photonHandle) {
    index++;

    reco::PhotonRef photonref(photonHandle, index);
    photons->push_back(photon);
    auto& newPhoton = photons->back();

    if ((applyPhotonCalibOnData_ && theEvent.isRealData()) || (applyPhotonCalibOnMC_ && !theEvent.isRealData())) {
      calibratePhoton(newPhoton, photonref, *photonCalibEnergyHandle, *photonCalibEnergyErrHandle);
    }

    //we do this after calibration
    bool keep = keepPhotonSel_(newPhoton);
    if (!keep) {
      photons->pop_back();
      continue;
    }

    //fill pf candidate value map vector
    pfCandIsoPairVecPho.push_back((*photonPfCandMapHandle)[photonref]);

    //fill photon id valuemap vectors
    int subindex = 0;
    for (const auto& photonIdHandle : photonIdHandles) {
      photonIdVals[subindex++].push_back((*photonIdHandle)[photonref]);
    }

    subindex = 0;
    for (const auto& photonFloatValueMapHandle : photonFloatValueMapHandles) {
      photonFloatValueMapVals[subindex++].push_back((*photonFloatValueMapHandle)[photonref]);
    }

    //link photon core
    const reco::PhotonCoreRef& photonCore = photon.photonCore();
    linkCore(photonCore, *photonCores, photonCoreMap);

    bool slimRelink = slimRelinkPhotonSel_(newPhoton);
    //no supercluster relinking unless slimRelink selection is satisfied
    if (!slimRelink)
      continue;

    bool relink = relinkPhotonSel_(newPhoton);

    //link supercluster
    const reco::SuperClusterRef& superCluster = photon.superCluster();
    linkSuperCluster(superCluster, superClusterMap, *superClusters, relink, superClusterFullRelinkMap);

    //conversions only for full relinking
    if (!relink)
      continue;

    const reco::ConversionRefVector& convrefs = photon.conversions();
    linkConversions(convrefs, *conversions, conversionMap);

    //explicitly references conversions
    const reco::ConversionRefVector& singleconvrefs = photon.conversionsOneLeg();
    linkConversions(singleconvrefs, *singleConversions, singleConversionMap);

    //hcal hits
    linkHcalHits(*photon.superCluster(), *hbheHitHandle, hcalRechitMap);
  }

  //loop over oot photons and fill maps
  //special note1: since not PFCand --> no PF isolation, IDs (but we do have FloatValueMap!)
  //special note2: conversion sequence not run over bcs from oot phos, so skip relinking of oot phos
  //special note3: clusters and superclusters in own collections!
  if (!ootPhotonT_.isUninitialized()) {
    index = -1;
    for (const auto& ootPhoton : *ootPhotonHandle) {
      index++;

      bool keep = keepOOTPhotonSel_(ootPhoton);
      if (!keep)
        continue;

      reco::PhotonRef ootPhotonref(ootPhotonHandle, index);

      ootPhotons->push_back(ootPhoton);

      //fill photon pfclusteriso valuemap vectors
      int subindex = 0;
      for (const auto& ootPhotonFloatValueMapHandle : ootPhotonFloatValueMapHandles) {
        ootPhotonFloatValueMapVals[subindex++].push_back((*ootPhotonFloatValueMapHandle)[ootPhotonref]);
      }

      //link photon core
      const reco::PhotonCoreRef& ootPhotonCore = ootPhoton.photonCore();
      linkCore(ootPhotonCore, *ootPhotonCores, ootPhotonCoreMap);

      bool slimRelink = slimRelinkOOTPhotonSel_(ootPhoton);
      //no supercluster relinking unless slimRelink selection is satisfied
      if (!slimRelink)
        continue;

      bool relink = relinkOOTPhotonSel_(ootPhoton);

      const reco::SuperClusterRef& ootSuperCluster = ootPhoton.superCluster();
      linkSuperCluster(ootSuperCluster, ootSuperClusterMap, *ootSuperClusters, relink, ootSuperClusterFullRelinkMap);
      //hcal hits
      linkHcalHits(*ootPhoton.superCluster(), *hbheHitHandle, hcalRechitMap);
    }
  }

  //loop over electrons and fill maps
  index = -1;
  for (const auto& gsfElectron : *gsfElectronHandle) {
    index++;

    reco::GsfElectronRef gsfElectronref(gsfElectronHandle, index);
    gsfElectrons->push_back(gsfElectron);
    auto& newGsfElectron = gsfElectrons->back();
    if ((applyGsfElectronCalibOnData_ && theEvent.isRealData()) ||
        (applyGsfElectronCalibOnMC_ && !theEvent.isRealData())) {
      calibrateElectron(newGsfElectron,
                        gsfElectronref,
                        *gsfElectronCalibEnergyHandle,
                        *gsfElectronCalibEnergyErrHandle,
                        *gsfElectronCalibEcalEnergyHandle,
                        *gsfElectronCalibEcalEnergyErrHandle);
    }

    bool keep = keepGsfElectronSel_(newGsfElectron);
    if (!keep) {
      gsfElectrons->pop_back();
      continue;
    }

    pfCandIsoPairVecEle.push_back((*gsfElectronPfCandMapHandle)[gsfElectronref]);

    //fill electron id valuemap vectors
    int subindex = 0;
    for (const auto& gsfElectronIdHandle : gsfElectronIdHandles) {
      gsfElectronIdVals[subindex++].push_back((*gsfElectronIdHandle)[gsfElectronref]);
    }

    subindex = 0;
    for (const auto& gsfElectronFloatValueMapHandle : gsfElectronFloatValueMapHandles) {
      gsfElectronFloatValueMapVals[subindex++].push_back((*gsfElectronFloatValueMapHandle)[gsfElectronref]);
    }

    const reco::GsfElectronCoreRef& gsfElectronCore = gsfElectron.core();
    linkCore(gsfElectronCore, *gsfElectronCores, gsfElectronCoreMap);

    const reco::GsfTrackRef& gsfTrack = gsfElectron.gsfTrack();

    // Save the main gsfTrack
    if (!gsfTrackMap.count(gsfTrack)) {
      gsfTracks->push_back(*gsfTrack);
      gsfTrackMap[gsfTrack] = gsfTracks->size() - 1;
    }

    // Save additional ambiguous gsf tracks in a map:
    for (reco::GsfTrackRefVector::const_iterator igsf = gsfElectron.ambiguousGsfTracksBegin();
         igsf != gsfElectron.ambiguousGsfTracksEnd();
         ++igsf) {
      const reco::GsfTrackRef& ambigGsfTrack = *igsf;
      if (!gsfTrackMap.count(ambigGsfTrack)) {
        gsfTracks->push_back(*ambigGsfTrack);
        gsfTrackMap[ambigGsfTrack] = gsfTracks->size() - 1;
      }
    }

    bool slimRelink = slimRelinkGsfElectronSel_(newGsfElectron);
    //no supercluster relinking unless slimRelink selection is satisfied
    if (!slimRelink)
      continue;

    bool relink = relinkGsfElectronSel_(newGsfElectron);

    const reco::SuperClusterRef& superCluster = gsfElectron.superCluster();
    linkSuperCluster(superCluster, superClusterMap, *superClusters, relink, superClusterFullRelinkMap);

    //conversions only for full relinking
    if (!relink)
      continue;

    const reco::ConversionRefVector& convrefs = gsfElectron.core()->conversions();
    linkConversions(convrefs, *conversions, conversionMap);

    //explicitly references conversions
    const reco::ConversionRefVector& singleconvrefs = gsfElectron.core()->conversionsOneLeg();
    linkConversions(singleconvrefs, *singleConversions, singleConversionMap);

    //conversions matched by trackrefs
    linkConversionsByTrackRef(conversionHandle, gsfElectron, *conversions, conversionMap);

    //single leg conversions matched by trackrefs
    linkConversionsByTrackRef(singleConversionHandle, gsfElectron, *singleConversions, singleConversionMap);

    //hcal hits
    linkHcalHits(*gsfElectron.superCluster(), *hbheHitHandle, hcalRechitMap);
  }

  //loop over output SuperClusters and fill maps
  index = 0;
  for (auto& superCluster : *superClusters) {
    //link seed cluster no matter what
    const reco::CaloClusterPtr& seedCluster = superCluster.seed();
    linkCaloCluster(seedCluster, *ebeeClusters, ebeeClusterMap);

    //only proceed if superCluster is marked for full relinking
    bool fullrelink = superClusterFullRelinkMap.count(index++);
    if (!fullrelink) {
      //zero detid vector which is anyways not useful without stored rechits
      superCluster.clearHitsAndFractions();
      continue;
    }

    // link calo clusters
    linkCaloClusters(superCluster,
                     *ebeeClusters,
                     ebeeClusterMap,
                     rechitMap,
                     barrelHitHandle,
                     endcapHitHandle,
                     caloTopology,
                     *esClusters,
                     esClusterMap);

    //conversions matched geometrically
    linkConversionsByTrackRef(conversionHandle, superCluster, *conversions, conversionMap);

    //single leg conversions matched by trackrefs
    linkConversionsByTrackRef(singleConversionHandle, superCluster, *singleConversions, singleConversionMap);
  }

  //loop over output OOTSuperClusters and fill maps
  if (!ootPhotonT_.isUninitialized()) {
    index = 0;
    for (auto& ootSuperCluster : *ootSuperClusters) {
      //link seed cluster no matter what
      const reco::CaloClusterPtr& ootSeedCluster = ootSuperCluster.seed();
      linkCaloCluster(ootSeedCluster, *ootEbeeClusters, ootEbeeClusterMap);

      //only proceed if ootSuperCluster is marked for full relinking
      bool fullrelink = ootSuperClusterFullRelinkMap.count(index++);
      if (!fullrelink) {
        //zero detid vector which is anyways not useful without stored rechits
        ootSuperCluster.clearHitsAndFractions();
        continue;
      }

      // link calo clusters
      linkCaloClusters(ootSuperCluster,
                       *ootEbeeClusters,
                       ootEbeeClusterMap,
                       rechitMap,
                       barrelHitHandle,
                       endcapHitHandle,
                       caloTopology,
                       *ootEsClusters,
                       ootEsClusterMap);
    }
  }
  //now finalize and add to the event collections in "reverse" order

  //rechits (fill output collections of rechits to be stored)
  for (const EcalRecHit& rechit : *barrelHitHandle) {
    if (rechitMap.count(rechit.detid())) {
      ebRecHits->push_back(rechit);
    }
  }

  for (const EcalRecHit& rechit : *endcapHitHandle) {
    if (rechitMap.count(rechit.detid())) {
      eeRecHits->push_back(rechit);
    }
  }

  theEvent.put(std::move(ebRecHits), outEBRecHits_);
  theEvent.put(std::move(eeRecHits), outEERecHits_);

  if (doPreshowerEcalHits_) {
    for (const EcalRecHit& rechit : *preshowerHitHandle) {
      if (rechitMap.count(rechit.detid())) {
        esRecHits->push_back(rechit);
      }
    }
    theEvent.put(std::move(esRecHits), outESRecHits_);
  }

  for (const HBHERecHit& rechit : *hbheHitHandle) {
    if (hcalRechitMap.count(rechit.detid())) {
      hbheRecHits->push_back(rechit);
    }
  }
  theEvent.put(std::move(hbheRecHits), outHBHERecHits_);

  //CaloClusters
  //put calocluster output collections in event and get orphan handles to create ptrs
  const edm::OrphanHandle<reco::CaloClusterCollection>& outEBEEClusterHandle =
      theEvent.put(std::move(ebeeClusters), outEBEEClusters_);
  const edm::OrphanHandle<reco::CaloClusterCollection>& outESClusterHandle =
      theEvent.put(std::move(esClusters), outESClusters_);
  ;

  //Loop over SuperClusters and relink GEDPhoton + GSFElectron CaloClusters
  for (reco::SuperCluster& superCluster : *superClusters) {
    relinkCaloClusters(superCluster, ebeeClusterMap, esClusterMap, outEBEEClusterHandle, outESClusterHandle);
  }

  //OOTCaloClusters
  //put ootcalocluster output collections in event and get orphan handles to create ptrs
  edm::OrphanHandle<reco::CaloClusterCollection> outOOTEBEEClusterHandle;
  edm::OrphanHandle<reco::CaloClusterCollection> outOOTESClusterHandle;
  //Loop over OOTSuperClusters and relink OOTPhoton CaloClusters
  if (!ootPhotonT_.isUninitialized()) {
    outOOTEBEEClusterHandle = theEvent.put(std::move(ootEbeeClusters), outOOTEBEEClusters_);
    outOOTESClusterHandle = theEvent.put(std::move(ootEsClusters), outOOTESClusters_);
    for (reco::SuperCluster& ootSuperCluster : *ootSuperClusters) {
      relinkCaloClusters(
          ootSuperCluster, ootEbeeClusterMap, ootEsClusterMap, outOOTEBEEClusterHandle, outOOTESClusterHandle);
    }
  }
  //put superclusters and conversions in the event
  const edm::OrphanHandle<reco::SuperClusterCollection>& outSuperClusterHandle =
      theEvent.put(std::move(superClusters), outSuperClusters_);
  const edm::OrphanHandle<reco::ConversionCollection>& outConversionHandle =
      theEvent.put(std::move(conversions), outConversions_);
  const edm::OrphanHandle<reco::ConversionCollection>& outSingleConversionHandle =
      theEvent.put(std::move(singleConversions), outSingleConversions_);
  const edm::OrphanHandle<reco::GsfTrackCollection>& outGsfTrackHandle =
      theEvent.put(std::move(gsfTracks), outGsfTracks_);

  //Loop over PhotonCores and relink GEDPhoton SuperClusters (and conversions)
  for (reco::PhotonCore& photonCore : *photonCores) {
    // superclusters
    relinkSuperCluster(photonCore, superClusterMap, outSuperClusterHandle);

    //conversions
    const reco::ConversionRefVector& convrefs = photonCore.conversions();
    relinkConversions(photonCore, convrefs, conversionMap, outConversionHandle);

    //single leg conversions
    const reco::ConversionRefVector& singleconvrefs = photonCore.conversionsOneLeg();
    relinkConversions(photonCore, singleconvrefs, singleConversionMap, outSingleConversionHandle);
  }

  //Relink GSFElectron SuperClusters and main GSF Tracks
  for (reco::GsfElectronCore& gsfElectronCore : *gsfElectronCores) {
    relinkSuperCluster(gsfElectronCore, superClusterMap, outSuperClusterHandle);
    relinkGsfTrack(gsfElectronCore, gsfTrackMap, outGsfTrackHandle);
  }

  //put ootsuperclusters in the event
  edm::OrphanHandle<reco::SuperClusterCollection> outOOTSuperClusterHandle;
  if (!ootPhotonT_.isUninitialized())
    outOOTSuperClusterHandle = theEvent.put(std::move(ootSuperClusters), outOOTSuperClusters_);

  //Relink OOTPhoton SuperClusters
  for (reco::PhotonCore& ootPhotonCore : *ootPhotonCores) {
    relinkSuperCluster(ootPhotonCore, ootSuperClusterMap, outOOTSuperClusterHandle);
  }

  //put photoncores and gsfelectroncores into the event
  const edm::OrphanHandle<reco::PhotonCoreCollection>& outPhotonCoreHandle =
      theEvent.put(std::move(photonCores), outPhotonCores_);
  edm::OrphanHandle<reco::PhotonCoreCollection> outOOTPhotonCoreHandle;
  if (!ootPhotonT_.isUninitialized())
    outOOTPhotonCoreHandle = theEvent.put(std::move(ootPhotonCores), outOOTPhotonCores_);
  const edm::OrphanHandle<reco::GsfElectronCoreCollection>& outgsfElectronCoreHandle =
      theEvent.put(std::move(gsfElectronCores), outGsfElectronCores_);

  //loop over photons, oot photons, and electrons and relink the cores
  for (reco::Photon& photon : *photons) {
    relinkPhotonCore(photon, photonCoreMap, outPhotonCoreHandle);
  }

  if (!ootPhotonT_.isUninitialized()) {
    for (reco::Photon& ootPhoton : *ootPhotons) {
      relinkPhotonCore(ootPhoton, ootPhotonCoreMap, outOOTPhotonCoreHandle);
    }
  }

  for (reco::GsfElectron& gsfElectron : *gsfElectrons) {
    relinkGsfElectronCore(gsfElectron, gsfElectronCoreMap, outgsfElectronCoreHandle);

    // -----
    // Also in this loop let's relink ambiguous tracks
    std::vector<reco::GsfTrackRef> ambigTracksInThisElectron;
    // Here we loop over the ambiguous tracks and save them in a vector
    for (reco::GsfTrackRefVector::const_iterator igsf = gsfElectron.ambiguousGsfTracksBegin();
         igsf != gsfElectron.ambiguousGsfTracksEnd();
         ++igsf) {
      ambigTracksInThisElectron.push_back(*igsf);
    }

    // Now we need to clear them (they are the refs to original collection):
    gsfElectron.clearAmbiguousGsfTracks();

    // And here we add them back, now from a new reduced collection:
    for (const auto& it : ambigTracksInThisElectron) {
      const auto& gsftkmapped = gsfTrackMap.find(it);

      if (gsftkmapped != gsfTrackMap.end()) {
        reco::GsfTrackRef gsftkref(outGsfTrackHandle, gsftkmapped->second);
        gsfElectron.addAmbiguousGsfTrack(gsftkref);
      } else
        throw cms::Exception("There must be a problem with linking and mapping of ambiguous gsf tracks...");
    }

    if (gsfElectron.ambiguousGsfTracksSize() > 0)
      gsfElectron.setAmbiguous(true);  // Set the flag

    ambigTracksInThisElectron.clear();
  }

  //(finally) store the output photon and electron collections
  const edm::OrphanHandle<reco::PhotonCollection>& outPhotonHandle = theEvent.put(std::move(photons), outPhotons_);
  edm::OrphanHandle<reco::PhotonCollection> outOOTPhotonHandle;
  if (!ootPhotonT_.isUninitialized())
    outOOTPhotonHandle = theEvent.put(std::move(ootPhotons), outOOTPhotons_);
  const edm::OrphanHandle<reco::GsfElectronCollection>& outGsfElectronHandle =
      theEvent.put(std::move(gsfElectrons), outGsfElectrons_);

  //still need to output relinked valuemaps

  //photon pfcand isolation valuemap
  edm::ValueMap<std::vector<reco::PFCandidateRef>>::Filler fillerPhotons(*photonPfCandMap);
  fillerPhotons.insert(outPhotonHandle, pfCandIsoPairVecPho.begin(), pfCandIsoPairVecPho.end());
  fillerPhotons.fill();

  //electron pfcand isolation valuemap
  edm::ValueMap<std::vector<reco::PFCandidateRef>>::Filler fillerGsfElectrons(*gsfElectronPfCandMap);
  fillerGsfElectrons.insert(outGsfElectronHandle, pfCandIsoPairVecEle.begin(), pfCandIsoPairVecEle.end());
  fillerGsfElectrons.fill();

  theEvent.put(std::move(photonPfCandMap), outPhotonPfCandMap_);
  theEvent.put(std::move(gsfElectronPfCandMap), outGsfElectronPfCandMap_);

  auto fillMap = [](auto refH, auto& vec, edm::Event& ev, const std::string& cAl = "") {
    typedef edm::ValueMap<typename std::decay<decltype(vec)>::type::value_type> MapType;
    auto oMap = std::make_unique<MapType>();
    {
      typename MapType::Filler filler(*oMap);
      filler.insert(refH, vec.begin(), vec.end());
      filler.fill();
    }
    ev.put(std::move(oMap), cAl);
  };

  //photon id value maps
  index = 0;
  for (auto const& vals : photonIdVals) {
    fillMap(outPhotonHandle, vals, theEvent, outPhotonIds_[index++]);
  }

  //electron id value maps
  index = 0;
  for (auto const& vals : gsfElectronIdVals) {
    fillMap(outGsfElectronHandle, vals, theEvent, outGsfElectronIds_[index++]);
  }

  // photon iso value maps
  index = 0;
  for (auto const& vals : photonFloatValueMapVals) {
    fillMap(outPhotonHandle, vals, theEvent, outPhotonFloatValueMaps_[index++]);
  }

  if (!ootPhotonT_.isUninitialized()) {
    //oot photon iso value maps
    index = 0;
    for (auto const& vals : ootPhotonFloatValueMapVals) {
      fillMap(outOOTPhotonHandle, vals, theEvent, outOOTPhotonFloatValueMaps_[index++]);
    }
  }

  //electron iso value maps
  index = 0;
  for (auto const& vals : gsfElectronFloatValueMapVals) {
    fillMap(outGsfElectronHandle, vals, theEvent, outGsfElectronFloatValueMaps_[index++]);
  }
}

template <typename T, typename U>
void ReducedEGProducer::linkCore(const T& core, U& cores, std::map<T, unsigned int>& coreMap) {
  if (!coreMap.count(core)) {
    cores.push_back(*core);
    coreMap[core] = cores.size() - 1;
  }
}

void ReducedEGProducer::linkSuperCluster(const reco::SuperClusterRef& superCluster,
                                         std::map<reco::SuperClusterRef, unsigned int>& superClusterMap,
                                         reco::SuperClusterCollection& superClusters,
                                         const bool relink,
                                         std::unordered_set<unsigned int>& superClusterFullRelinkMap) {
  const auto& mappedsc = superClusterMap.find(superCluster);
  //get index in output collection in order to keep track whether superCluster
  //will be subject to full relinking
  unsigned int mappedscidx = 0;
  if (mappedsc == superClusterMap.end()) {
    superClusters.push_back(*superCluster);
    mappedscidx = superClusters.size() - 1;
    superClusterMap[superCluster] = mappedscidx;
  } else {
    mappedscidx = mappedsc->second;
  }

  //additionally mark supercluster for full relinking
  if (relink)
    superClusterFullRelinkMap.insert(mappedscidx);
}

void ReducedEGProducer::linkConversions(const reco::ConversionRefVector& convrefs,
                                        reco::ConversionCollection& conversions,
                                        std::map<reco::ConversionRef, unsigned int>& conversionMap) {
  for (const auto& convref : convrefs) {
    linkConversion(convref, conversions, conversionMap);
  }
}

void ReducedEGProducer::linkConversionsByTrackRef(const edm::Handle<reco::ConversionCollection>& conversionHandle,
                                                  const reco::GsfElectron& gsfElectron,
                                                  reco::ConversionCollection& conversions,
                                                  std::map<reco::ConversionRef, unsigned int>& conversionMap) {
  int index = 0;
  for (const auto& conversion : *conversionHandle) {
    reco::ConversionRef convref(conversionHandle, index++);

    bool matched = ConversionTools::matchesConversion(gsfElectron, conversion, true, true);
    if (!matched)
      continue;

    linkConversion(convref, conversions, conversionMap);
  }
}

void ReducedEGProducer::linkConversionsByTrackRef(const edm::Handle<reco::ConversionCollection>& conversionHandle,
                                                  const reco::SuperCluster& superCluster,
                                                  reco::ConversionCollection& conversions,
                                                  std::map<reco::ConversionRef, unsigned int>& conversionMap) {
  int index = 0;
  for (const auto& conversion : *conversionHandle) {
    reco::ConversionRef convref(conversionHandle, index++);

    bool matched = ConversionTools::matchesConversion(superCluster, conversion, 0.2);
    if (!matched)
      continue;

    linkConversion(convref, conversions, conversionMap);
  }
}

void ReducedEGProducer::linkConversion(const reco::ConversionRef& convref,
                                       reco::ConversionCollection& conversions,
                                       std::map<reco::ConversionRef, unsigned int>& conversionMap) {
  if (!conversionMap.count(convref)) {
    conversions.push_back(*convref);
    conversionMap[convref] = conversions.size() - 1;
  }
}

void ReducedEGProducer::linkCaloCluster(const reco::CaloClusterPtr& caloCluster,
                                        reco::CaloClusterCollection& caloClusters,
                                        std::map<reco::CaloClusterPtr, unsigned int>& caloClusterMap) {
  if (!caloClusterMap.count(caloCluster)) {
    caloClusters.push_back(*caloCluster);
    caloClusterMap[caloCluster] = caloClusters.size() - 1;
  }
}

void ReducedEGProducer::linkCaloClusters(const reco::SuperCluster& superCluster,
                                         reco::CaloClusterCollection& ebeeClusters,
                                         std::map<reco::CaloClusterPtr, unsigned int>& ebeeClusterMap,
                                         std::unordered_set<DetId>& rechitMap,
                                         const edm::Handle<EcalRecHitCollection>& barrelHitHandle,
                                         const edm::Handle<EcalRecHitCollection>& endcapHitHandle,
                                         const CaloTopology* caloTopology,
                                         reco::CaloClusterCollection& esClusters,
                                         std::map<reco::CaloClusterPtr, unsigned int>& esClusterMap) {
  for (const auto& cluster : superCluster.clusters()) {
    linkCaloCluster(cluster, ebeeClusters, ebeeClusterMap);

    for (const auto& hitfrac : cluster->hitsAndFractions()) {
      rechitMap.insert(hitfrac.first);
    }
    //make sure to also take all hits in the 5x5 around the max energy xtal
    bool barrel = cluster->hitsAndFractions().front().first.subdetId() == EcalBarrel;
    const EcalRecHitCollection* rhcol = barrel ? barrelHitHandle.product() : endcapHitHandle.product();
    DetId seed = EcalClusterTools::getMaximum(*cluster, rhcol).first;

    std::vector<DetId> dets5x5 =
        caloTopology->getSubdetectorTopology(DetId::Ecal, barrel ? EcalBarrel : EcalEndcap)->getWindow(seed, 5, 5);
    for (const auto& detid : dets5x5) {
      rechitMap.insert(detid);
    }
  }
  for (const auto& cluster : superCluster.preshowerClusters()) {
    linkCaloCluster(cluster, esClusters, esClusterMap);

    for (const auto& hitfrac : cluster->hitsAndFractions()) {
      rechitMap.insert(hitfrac.first);
    }
  }
}

void ReducedEGProducer::linkHcalHits(const reco::SuperCluster& superClus,
                                     const HBHERecHitCollection& recHits,
                                     std::unordered_set<DetId>& hcalDetIds) {
  hcalHitSel_.addDetIds(superClus, recHits, hcalDetIds);
}

void ReducedEGProducer::relinkCaloClusters(reco::SuperCluster& superCluster,
                                           const std::map<reco::CaloClusterPtr, unsigned int>& ebeeClusterMap,
                                           const std::map<reco::CaloClusterPtr, unsigned int>& esClusterMap,
                                           const edm::OrphanHandle<reco::CaloClusterCollection>& outEBEEClusterHandle,
                                           const edm::OrphanHandle<reco::CaloClusterCollection>& outESClusterHandle) {
  //remap seed cluster
  const auto& seedmapped = ebeeClusterMap.find(superCluster.seed());
  if (seedmapped != ebeeClusterMap.end()) {
    //make new ptr
    reco::CaloClusterPtr clusptr(outEBEEClusterHandle, seedmapped->second);
    superCluster.setSeed(clusptr);
  }

  //remap all clusters
  reco::CaloClusterPtrVector clusters;
  for (const auto& cluster : superCluster.clusters()) {
    const auto& clustermapped = ebeeClusterMap.find(cluster);
    if (clustermapped != ebeeClusterMap.end()) {
      //make new ptr
      reco::CaloClusterPtr clusptr(outEBEEClusterHandle, clustermapped->second);
      clusters.push_back(clusptr);
    } else {
      //can only relink if all clusters are being relinked, so if one is missing, then skip the relinking completely
      clusters.clear();
      break;
    }
  }
  if (!clusters.empty()) {
    superCluster.setClusters(clusters);
  }

  //remap preshower clusters
  reco::CaloClusterPtrVector esclusters;
  for (const auto& cluster : superCluster.preshowerClusters()) {
    const auto& clustermapped = esClusterMap.find(cluster);
    if (clustermapped != esClusterMap.end()) {
      //make new ptr
      reco::CaloClusterPtr clusptr(outESClusterHandle, clustermapped->second);
      esclusters.push_back(clusptr);
    } else {
      //can only relink if all clusters are being relinked, so if one is missing, then skip the relinking completely
      esclusters.clear();
      break;
    }
  }
  if (!esclusters.empty()) {
    superCluster.setPreshowerClusters(esclusters);
  }
}

template <typename T>
void ReducedEGProducer::relinkSuperCluster(
    T& core,
    const std::map<reco::SuperClusterRef, unsigned int>& superClusterMap,
    const edm::OrphanHandle<reco::SuperClusterCollection>& outSuperClusterHandle) {
  const auto& scmapped = superClusterMap.find(core.superCluster());
  if (scmapped != superClusterMap.end()) {
    //make new ref
    reco::SuperClusterRef scref(outSuperClusterHandle, scmapped->second);
    core.setSuperCluster(scref);
  }
}

void ReducedEGProducer::relinkGsfTrack(reco::GsfElectronCore& gsfElectronCore,
                                       const std::map<reco::GsfTrackRef, unsigned int>& gsfTrackMap,
                                       const edm::OrphanHandle<reco::GsfTrackCollection>& outGsfTrackHandle) {
  const auto& gsftkmapped = gsfTrackMap.find(gsfElectronCore.gsfTrack());
  if (gsftkmapped != gsfTrackMap.end()) {
    reco::GsfTrackRef gsftkref(outGsfTrackHandle, gsftkmapped->second);
    gsfElectronCore.setGsfTrack(gsftkref);
  }
}

void ReducedEGProducer::relinkConversions(reco::PhotonCore& photonCore,
                                          const reco::ConversionRefVector& convrefs,
                                          const std::map<reco::ConversionRef, unsigned int>& conversionMap,
                                          const edm::OrphanHandle<reco::ConversionCollection>& outConversionHandle) {
  reco::ConversionRefVector outconvrefs;
  for (const auto& convref : convrefs) {
    const auto& convmapped = conversionMap.find(convref);
    if (convmapped != conversionMap.end()) {
      //make new ref
      reco::ConversionRef outref(outConversionHandle, convmapped->second);
    } else {
      //can only relink if all conversions are being relinked, so if one is missing, then skip the relinking completely
      outconvrefs.clear();
      break;
    }
  }
  if (!outconvrefs.empty()) {
    photonCore.setConversions(outconvrefs);
  }
}

void ReducedEGProducer::relinkPhotonCore(reco::Photon& photon,
                                         const std::map<reco::PhotonCoreRef, unsigned int>& photonCoreMap,
                                         const edm::OrphanHandle<reco::PhotonCoreCollection>& outPhotonCoreHandle) {
  const auto& coremapped = photonCoreMap.find(photon.photonCore());
  if (coremapped != photonCoreMap.end()) {
    //make new ref
    reco::PhotonCoreRef coreref(outPhotonCoreHandle, coremapped->second);
    photon.setPhotonCore(coreref);
  }
}

void ReducedEGProducer::relinkGsfElectronCore(
    reco::GsfElectron& gsfElectron,
    const std::map<reco::GsfElectronCoreRef, unsigned int>& gsfElectronCoreMap,
    const edm::OrphanHandle<reco::GsfElectronCoreCollection>& outgsfElectronCoreHandle) {
  const auto& coremapped = gsfElectronCoreMap.find(gsfElectron.core());
  if (coremapped != gsfElectronCoreMap.end()) {
    //make new ref
    reco::GsfElectronCoreRef coreref(outgsfElectronCoreHandle, coremapped->second);
    gsfElectron.setCore(coreref);
  }
}

void ReducedEGProducer::calibratePhoton(reco::Photon& photon,
                                        const reco::PhotonRef& oldPhoRef,
                                        const edm::ValueMap<float>& energyMap,
                                        const edm::ValueMap<float>& energyErrMap) {
  float newEnergy = energyMap[oldPhoRef];
  float newEnergyErr = energyErrMap[oldPhoRef];
  photon.setCorrectedEnergy(reco::Photon::P4type::regression2, newEnergy, newEnergyErr, true);
}

void ReducedEGProducer::calibrateElectron(reco::GsfElectron& electron,
                                          const reco::GsfElectronRef& oldEleRef,
                                          const edm::ValueMap<float>& energyMap,
                                          const edm::ValueMap<float>& energyErrMap,
                                          const edm::ValueMap<float>& ecalEnergyMap,
                                          const edm::ValueMap<float>& ecalEnergyErrMap) {
  const float newEnergy = energyMap[oldEleRef];
  const float newEnergyErr = energyErrMap[oldEleRef];
  const float newEcalEnergy = ecalEnergyMap[oldEleRef];
  const float newEcalEnergyErr = ecalEnergyErrMap[oldEleRef];

  //make a copy of this as the setCorrectedEcalEnergy call with modifiy the electrons p4
  const math::XYZTLorentzVector oldP4 = electron.p4();
  const float corr = newEnergy / oldP4.E();

  electron.setCorrectedEcalEnergy(newEcalEnergy);
  electron.setCorrectedEcalEnergyError(newEcalEnergyErr);

  math::XYZTLorentzVector newP4 =
      math::XYZTLorentzVector(oldP4.x() * corr, oldP4.y() * corr, oldP4.z() * corr, newEnergy);
  electron.correctMomentum(newP4, electron.trackMomentumError(), newEnergyErr);
}