/data/doxygen/doxygen-1.7.3/gen/CMSSW_4_2_8/src/PhysicsTools/PatAlgos/plugins/PATElectronProducer.cc

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//
// $Id: PATElectronProducer.cc,v 1.47.2.4 2011/07/05 16:25:28 bellan Exp $
//

#include "PhysicsTools/PatAlgos/plugins/PATElectronProducer.h"

#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/ParameterSet/interface/FileInPath.h"

#include "DataFormats/Common/interface/Association.h"
#include "DataFormats/Common/interface/ValueMap.h"
#include "DataFormats/HepMCCandidate/interface/GenParticleFwd.h"
#include "DataFormats/HepMCCandidate/interface/GenParticle.h"

#include "DataFormats/ParticleFlowCandidate/interface/PFCandidateFwd.h"
#include "DataFormats/ParticleFlowCandidate/interface/PFCandidate.h"

#include "PhysicsTools/PatUtils/interface/TrackerIsolationPt.h"
#include "PhysicsTools/PatUtils/interface/CaloIsolationEnergy.h"

#include "DataFormats/BeamSpot/interface/BeamSpot.h"
#include "DataFormats/VertexReco/interface/Vertex.h"


#include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"
#include "FWCore/ParameterSet/interface/ParameterSetDescription.h"

#include "TrackingTools/TransientTrack/interface/TransientTrackBuilder.h"
#include "TrackingTools/Records/interface/TransientTrackRecord.h"
#include "TrackingTools/TransientTrack/interface/TransientTrack.h"
#include "TrackingTools/IPTools/interface/IPTools.h"

#include "DataFormats/GsfTrackReco/interface/GsfTrackFwd.h"
#include "DataFormats/GsfTrackReco/interface/GsfTrack.h"

#include <vector>
#include <memory>


using namespace pat;
using namespace std;


PATElectronProducer::PATElectronProducer(const edm::ParameterSet & iConfig) :
  isolator_(iConfig.exists("userIsolation") ? iConfig.getParameter<edm::ParameterSet>("userIsolation") : edm::ParameterSet(), false) ,
  useUserData_(iConfig.exists("userData"))
{

  // general configurables
  electronSrc_      = iConfig.getParameter<edm::InputTag>( "electronSource" );
  embedGsfElectronCore_    = iConfig.getParameter<bool>         ( "embedGsfElectronCore" );
  embedGsfTrack_    = iConfig.getParameter<bool>         ( "embedGsfTrack" );
  embedSuperCluster_= iConfig.getParameter<bool>         ( "embedSuperCluster" );
  embedTrack_       = iConfig.getParameter<bool>         ( "embedTrack" );

  // pflow specific
  pfElecSrc_        = iConfig.getParameter<edm::InputTag>( "pfElectronSource" );
  useParticleFlow_  = iConfig.getParameter<bool>( "useParticleFlow" );
  linkToPFSource_   = iConfig.getParameter<edm::InputTag>( "linkToPFSource" );  //SAK
  embedPFCandidate_ = iConfig.getParameter<bool>( "embedPFCandidate" );


  // MC matching configurables
  addGenMatch_      = iConfig.getParameter<bool>          ( "addGenMatch" );
  if (addGenMatch_) {
    embedGenMatch_ = iConfig.getParameter<bool>         ( "embedGenMatch" );
    if (iConfig.existsAs<edm::InputTag>("genParticleMatch")) {
      genMatchSrc_.push_back(iConfig.getParameter<edm::InputTag>( "genParticleMatch" ));
    } else {
      genMatchSrc_ = iConfig.getParameter<std::vector<edm::InputTag> >( "genParticleMatch" );
    }
  }

  // resolution configurables
  addResolutions_   = iConfig.getParameter<bool>         ( "addResolutions" );
  if (addResolutions_) {
    resolutionLoader_ = pat::helper::KinResolutionsLoader(iConfig.getParameter<edm::ParameterSet>("resolutions"));
  }


  // electron ID configurables
  addElecID_        = iConfig.getParameter<bool>         ( "addElectronID" );
  if (addElecID_) {
    // it might be a single electron ID
    if (iConfig.existsAs<edm::InputTag>("electronIDSource")) {
      elecIDSrcs_.push_back(NameTag("", iConfig.getParameter<edm::InputTag>("electronIDSource")));
    }
    // or there might be many of them
    if (iConfig.existsAs<edm::ParameterSet>("electronIDSources")) {
      // please don't configure me twice
      if (!elecIDSrcs_.empty()) throw cms::Exception("Configuration") <<
                                  "PATElectronProducer: you can't specify both 'electronIDSource' and 'electronIDSources'\n";
      // read the different electron ID names
      edm::ParameterSet idps = iConfig.getParameter<edm::ParameterSet>("electronIDSources");
      std::vector<std::string> names = idps.getParameterNamesForType<edm::InputTag>();
      for (std::vector<std::string>::const_iterator it = names.begin(), ed = names.end(); it != ed; ++it) {
        elecIDSrcs_.push_back(NameTag(*it, idps.getParameter<edm::InputTag>(*it)));
      }
    }
    // but in any case at least once
    if (elecIDSrcs_.empty()) throw cms::Exception("Configuration") <<
                               "PATElectronProducer: id addElectronID is true, you must specify either:\n" <<
                               "\tInputTag electronIDSource = <someTag>\n" << "or\n" <<
                               "\tPSet electronIDSources = { \n" <<
                               "\t\tInputTag <someName> = <someTag>   // as many as you want \n " <<
                               "\t}\n";
  }

  // construct resolution calculator

  //   // IsoDeposit configurables
  //   if (iConfig.exists("isoDeposits")) {
  //      edm::ParameterSet depconf = iConfig.getParameter<edm::ParameterSet>("isoDeposits");
  //      if (depconf.exists("tracker")) isoDepositLabels_.push_back(std::make_pair(TrackerIso, depconf.getParameter<edm::InputTag>("tracker")));
  //      if (depconf.exists("ecal"))    isoDepositLabels_.push_back(std::make_pair(ECalIso, depconf.getParameter<edm::InputTag>("ecal")));
  //      if (depconf.exists("hcal"))    isoDepositLabels_.push_back(std::make_pair(HCalIso, depconf.getParameter<edm::InputTag>("hcal")));


  //      if (depconf.exists("user")) {
  //         std::vector<edm::InputTag> userdeps = depconf.getParameter<std::vector<edm::InputTag> >("user");
  //         std::vector<edm::InputTag>::const_iterator it = userdeps.begin(), ed = userdeps.end();
  //         int key = UserBaseIso;
  //         for ( ; it != ed; ++it, ++key) {
  //             isoDepositLabels_.push_back(std::make_pair(IsolationKeys(key), *it));
  //         }
  //      }
  //   }

  // read isoDeposit labels, for direct embedding
  readIsolationLabels(iConfig, "isoDeposits", isoDepositLabels_);

  // read isolation value labels, for direct embedding
  readIsolationLabels(iConfig, "isolationValues", isolationValueLabels_);

  // Efficiency configurables
  addEfficiencies_ = iConfig.getParameter<bool>("addEfficiencies");
  if (addEfficiencies_) {
    efficiencyLoader_ = pat::helper::EfficiencyLoader(iConfig.getParameter<edm::ParameterSet>("efficiencies"));
  }

  // Check to see if the user wants to add user data
  if ( useUserData_ ) {
    userDataHelper_ = PATUserDataHelper<Electron>(iConfig.getParameter<edm::ParameterSet>("userData"));
  }

  // embed high level selection variables?
  embedHighLevelSelection_ = iConfig.getParameter<bool>("embedHighLevelSelection");
  if ( embedHighLevelSelection_ ) {
    beamLineSrc_ = iConfig.getParameter<edm::InputTag>("beamLineSrc");
    usePV_ = iConfig.getParameter<bool>("usePV");
    pvSrc_ = iConfig.getParameter<edm::InputTag>("pvSrc");
  }


  // produces vector of muons
  produces<std::vector<Electron> >();

}


PATElectronProducer::~PATElectronProducer() {
}


void PATElectronProducer::produce(edm::Event & iEvent, const edm::EventSetup & iSetup) {

  // Get the collection of electrons from the event
  edm::Handle<edm::View<reco::GsfElectron> > electrons;
  iEvent.getByLabel(electronSrc_, electrons);

  if (iEvent.isRealData()){
       addGenMatch_ = false;
       embedGenMatch_ = false;
   }

  // Get the ESHandle for the transient track builder, if needed for
  // high level selection embedding
  edm::ESHandle<TransientTrackBuilder> trackBuilder;

  if (isolator_.enabled()) isolator_.beginEvent(iEvent,iSetup);

  if (efficiencyLoader_.enabled()) efficiencyLoader_.newEvent(iEvent);
  if (resolutionLoader_.enabled()) resolutionLoader_.newEvent(iEvent, iSetup);

  IsoDepositMaps deposits(isoDepositLabels_.size());
  for (size_t j = 0, nd = deposits.size(); j < nd; ++j) {
    iEvent.getByLabel(isoDepositLabels_[j].second, deposits[j]);
  }

  IsolationValueMaps isolationValues(isolationValueLabels_.size());
  for (size_t j = 0; j<isolationValueLabels_.size(); ++j) {
    iEvent.getByLabel(isolationValueLabels_[j].second, isolationValues[j]);
  }

  // prepare the MC matching
  GenAssociations  genMatches(genMatchSrc_.size());
  if (addGenMatch_) {
    for (size_t j = 0, nd = genMatchSrc_.size(); j < nd; ++j) {
      iEvent.getByLabel(genMatchSrc_[j], genMatches[j]);
    }
  }

  // prepare ID extraction
  std::vector<edm::Handle<edm::ValueMap<float> > > idhandles;
  std::vector<pat::Electron::IdPair>               ids;
  if (addElecID_) {
    idhandles.resize(elecIDSrcs_.size());
    ids.resize(elecIDSrcs_.size());
    for (size_t i = 0; i < elecIDSrcs_.size(); ++i) {
      iEvent.getByLabel(elecIDSrcs_[i].second, idhandles[i]);
      ids[i].first = elecIDSrcs_[i].first;
    }
  }


  // prepare the high level selection:
  // needs beamline
  reco::TrackBase::Point beamPoint(0,0,0);
  reco::Vertex primaryVertex;
  reco::BeamSpot beamSpot;
  bool beamSpotIsValid = false;
  bool primaryVertexIsValid = false;
  if ( embedHighLevelSelection_ ) {
    // Get the beamspot
    edm::Handle<reco::BeamSpot> beamSpotHandle;
    iEvent.getByLabel(beamLineSrc_, beamSpotHandle);

    // Get the primary vertex
    edm::Handle< std::vector<reco::Vertex> > pvHandle;
    iEvent.getByLabel( pvSrc_, pvHandle );

    // This is needed by the IPTools methods from the tracking group
    iSetup.get<TransientTrackRecord>().get("TransientTrackBuilder", trackBuilder);

    if ( ! usePV_ ) {
      if ( beamSpotHandle.isValid() ){
        beamSpot = *beamSpotHandle;
        beamSpotIsValid = true;
      } else{
        edm::LogError("DataNotAvailable")
          << "No beam spot available from EventSetup, not adding high level selection \n";
      }

      double x0 = beamSpot.x0();
      double y0 = beamSpot.y0();
      double z0 = beamSpot.z0();

      beamPoint = reco::TrackBase::Point ( x0, y0, z0 );
    } else {
      if ( pvHandle.isValid() && !pvHandle->empty() ) {
        primaryVertex = pvHandle->at(0);
        primaryVertexIsValid = true;
      } else {
        edm::LogError("DataNotAvailable")
          << "No primary vertex available from EventSetup, not adding high level selection \n";
      }
    }
  }

  std::vector<Electron> * patElectrons = new std::vector<Electron>();

  if( useParticleFlow_ ) {
    edm::Handle< reco::PFCandidateCollection >  pfElectrons;
    iEvent.getByLabel(pfElecSrc_, pfElectrons);
    //-- SAK ------------------------------------------------------------------
    edm::Handle< reco::PFCandidateCollection >  pfForLinking;
    if (linkToPFSource_.label().length())
      iEvent.getByLabel(linkToPFSource_, pfForLinking);
    //-- SAK ------------------------------------------------------------------
    unsigned index=0;

    for( reco::PFCandidateConstIterator i = pfElectrons->begin();
         i != pfElectrons->end(); ++i, ++index) {

      reco::PFCandidateRef pfRef(pfElectrons, index);
      reco::PFCandidatePtr ptrToPFElectron(pfElectrons,index);
//       reco::CandidateBaseRef pfBaseRef( pfRef );

      reco::GsfTrackRef PfTk= i->gsfTrackRef();

      bool Matched=false;
      bool MatchedToAmbiguousGsfTrack=false;
      for (edm::View<reco::GsfElectron>::const_iterator itElectron = electrons->begin(); itElectron != electrons->end(); ++itElectron) {
        unsigned int idx = itElectron - electrons->begin();
        if (Matched || MatchedToAmbiguousGsfTrack) continue;

        reco::GsfTrackRef EgTk= itElectron->gsfTrack();

        if (itElectron->gsfTrack()==i->gsfTrackRef()){
          Matched=true;
        }
        else {
          for( reco::GsfTrackRefVector::const_iterator it = itElectron->ambiguousGsfTracksBegin() ;
               it!=itElectron->ambiguousGsfTracksEnd(); it++ ){
            MatchedToAmbiguousGsfTrack |= (bool)(i->gsfTrackRef()==(*it));
          }
        }

        if (Matched || MatchedToAmbiguousGsfTrack){

          // ptr needed for finding the matched gen particle
          reco::CandidatePtr ptrToGsfElectron(electrons,idx);

          // ref to base needed for the construction of the pat object
          const edm::RefToBase<reco::GsfElectron>& elecsRef = electrons->refAt(idx);
          Electron anElectron(elecsRef);
          anElectron.setPFCandidateRef( pfRef  );

          if( embedPFCandidate_ ) anElectron.embedPFCandidate();

          if ( useUserData_ ) {
            userDataHelper_.add( anElectron, iEvent, iSetup );
          }


          // embed high level selection
          if ( embedHighLevelSelection_ ) {
            // get the global track
            reco::GsfTrackRef track = PfTk;

            // Make sure the collection it points to is there
            if ( track.isNonnull() && track.isAvailable() ) {

              reco::TransientTrack tt = trackBuilder->build(track);
              embedHighLevel( anElectron, 
                              track,
                              tt,
                              primaryVertex,
                              primaryVertexIsValid,
                              beamSpot,
                              beamSpotIsValid );

              if ( !usePV_ ) {
                double corr_d0 = track->dxy( beamPoint );
                anElectron.setDB( corr_d0, -1.0 );
              } else {
                std::pair<bool,Measurement1D> result = IPTools::absoluteTransverseImpactParameter(tt, primaryVertex);
                double d0_corr = result.second.value();
                double d0_err = result.second.error();
                anElectron.setDB( d0_corr, d0_err );
              }
            }
          }

          //Electron Id

          if (addElecID_) {
            //STANDARD EL ID
            for (size_t i = 0; i < elecIDSrcs_.size(); ++i) {
              ids[i].second = (*idhandles[i])[elecsRef];
            }
            //SPECIFIC PF ID
            ids.push_back(std::make_pair("pf_evspi",pfRef->mva_e_pi()));
            ids.push_back(std::make_pair("pf_evsmu",pfRef->mva_e_mu()));
            anElectron.setElectronIDs(ids);
          }

//        fillElectron(anElectron,elecsRef,pfBaseRef,
//                     genMatches, deposits, isolationValues);

          //COLIN small warning !
          // we are currently choosing to take the 4-momentum of the PFCandidate;
          // the momentum of the GsfElectron is saved though
          // we must therefore match the GsfElectron.
          // because of this, we should not change the source of the electron matcher
          // to the collection of PFElectrons in the python configuration
          // I don't know what to do with the efficiencyLoader, since I don't know
          // what this class is for.
          fillElectron2( anElectron,
                         ptrToPFElectron,
                         ptrToGsfElectron,
                         ptrToGsfElectron,
                         genMatches, deposits, isolationValues );

          //COLIN need to use fillElectron2 in the non-pflow case as well, and to test it.

    //-- SAK ------------------------------------------------------------------
    if (linkToPFSource_.label().length() && anElectron.pfCandidateRef().id() != pfForLinking.id()) {
      reco::CandidatePtr  source  = anElectron.pfCandidateRef()->sourceCandidatePtr(0);
      while (source.id() != pfForLinking.id()) {
        source  = source->sourceCandidatePtr(0);
        if (source.isNull())
          throw cms::Exception("InputSource", "Object in "+pfElecSrc_.encode()+" does not link back to "+linkToPFSource_.encode());
      } // end loop over inheritance chain
      anElectron.setPFCandidateRef(reco::PFCandidateRef(pfForLinking, source.key()));
    }
    //-- SAK ------------------------------------------------------------------
          patElectrons->push_back(anElectron);
        }
      }
      //if( !Matched && !MatchedToAmbiguousGsfTrack) std::cout << "!!!!A pf electron could not be matched to a gsf!!!!"  << std::endl;
    }
  }

  else{
    for (edm::View<reco::GsfElectron>::const_iterator itElectron = electrons->begin(); itElectron != electrons->end(); ++itElectron) {
      // construct the Electron from the ref -> save ref to original object
      unsigned int idx = itElectron - electrons->begin();
      edm::RefToBase<reco::GsfElectron> elecsRef = electrons->refAt(idx);
      reco::CandidateBaseRef elecBaseRef(elecsRef);
      Electron anElectron(elecsRef);

      // add resolution info

      // Isolation
      if (isolator_.enabled()) {
        isolator_.fill(*electrons, idx, isolatorTmpStorage_);
        typedef pat::helper::MultiIsolator::IsolationValuePairs IsolationValuePairs;
        // better to loop backwards, so the vector is resized less times
        for (IsolationValuePairs::const_reverse_iterator it = isolatorTmpStorage_.rbegin(), ed = isolatorTmpStorage_.rend(); it != ed; ++it) {
          anElectron.setIsolation(it->first, it->second);
        }
      }

      for (size_t j = 0, nd = deposits.size(); j < nd; ++j) {
        anElectron.setIsoDeposit(isoDepositLabels_[j].first, (*deposits[j])[elecsRef]);
      }

      // add electron ID info
      if (addElecID_) {
        for (size_t i = 0; i < elecIDSrcs_.size(); ++i) {
          ids[i].second = (*idhandles[i])[elecsRef];
        }
        anElectron.setElectronIDs(ids);
      }


      if ( useUserData_ ) {
        userDataHelper_.add( anElectron, iEvent, iSetup );
      }


      // embed high level selection
      if ( embedHighLevelSelection_ ) {
        // get the global track
        reco::GsfTrackRef track = itElectron->gsfTrack();

        // Make sure the collection it points to is there
        if ( track.isNonnull() && track.isAvailable() ) {

          reco::TransientTrack tt = trackBuilder->build(track);
          embedHighLevel( anElectron, 
                          track,
                          tt,
                          primaryVertex,
                          primaryVertexIsValid,
                          beamSpot,
                          beamSpotIsValid );


          if ( !usePV_ ) {
            double corr_d0 = track->dxy( beamPoint );
            anElectron.setDB( corr_d0, -1.0 );
          } else {
            
            std::pair<bool,Measurement1D> result = IPTools::absoluteTransverseImpactParameter(tt, primaryVertex);
            double d0_corr = result.second.value();
            double d0_err = result.second.error();
            anElectron.setDB( d0_corr, d0_err );
          }
        }
      }

      // add sel to selected
      fillElectron( anElectron, elecsRef,elecBaseRef,
                    genMatches, deposits, isolationValues);
      patElectrons->push_back(anElectron);
    }
  }

  // sort electrons in pt
  std::sort(patElectrons->begin(), patElectrons->end(), pTComparator_);

  // add the electrons to the event output
  std::auto_ptr<std::vector<Electron> > ptr(patElectrons);
  iEvent.put(ptr);

  // clean up
  if (isolator_.enabled()) isolator_.endEvent();

}

void PATElectronProducer::fillElectron(Electron& anElectron,
                                       const edm::RefToBase<reco::GsfElectron>& elecRef,
                                       const reco::CandidateBaseRef& baseRef,
                                       const GenAssociations& genMatches,
                                       const IsoDepositMaps& deposits,
                                       const IsolationValueMaps& isolationValues
                                       ) const {

  //COLIN: might want to use the PFCandidate 4-mom. Which one is in use now?
  //   if (useParticleFlow_)
  //     aMuon.setP4( aMuon.pfCandidateRef()->p4() );

  //COLIN:
  //In the embedding case, the reference cannot be used to look into a value map.
  //therefore, one has to had the PFCandidateRef to this function, which becomes a bit
  //too much specific.

  // in fact, this function needs a baseref or ptr for genmatch
  // and a baseref or ptr for isodeposits and isolationvalues.
  // baseref is not needed
  // the ptrForIsolation and ptrForMatching should be defined upstream.

  // is the concrete elecRef needed for the efficiency loader? what is this loader?
  // how can we make it compatible with the particle flow electrons?

  if (embedGsfElectronCore_) anElectron.embedGsfElectronCore();
  if (embedGsfTrack_) anElectron.embedGsfTrack();
  if (embedSuperCluster_) anElectron.embedSuperCluster();
  if (embedTrack_) anElectron.embedTrack();

  // store the match to the generated final state muons
  if (addGenMatch_) {
    for(size_t i = 0, n = genMatches.size(); i < n; ++i) {
      if(useParticleFlow_) {
        reco::GenParticleRef genElectron = (*genMatches[i])[anElectron.pfCandidateRef()];
        anElectron.addGenParticleRef(genElectron);
      }
      else {
        reco::GenParticleRef genElectron = (*genMatches[i])[elecRef];
        anElectron.addGenParticleRef(genElectron);
      }
    }
    if (embedGenMatch_) anElectron.embedGenParticle();
  }

  if (efficiencyLoader_.enabled()) {
    efficiencyLoader_.setEfficiencies( anElectron, elecRef );
  }

  if (resolutionLoader_.enabled()) {
    resolutionLoader_.setResolutions(anElectron);
  }

  for (size_t j = 0, nd = deposits.size(); j < nd; ++j) {
    if(useParticleFlow_) {

      reco::PFCandidateRef pfcandref =  anElectron.pfCandidateRef();
      assert(!pfcandref.isNull());
      reco::CandidatePtr source = pfcandref->sourceCandidatePtr(0);
      anElectron.setIsoDeposit(isoDepositLabels_[j].first,
                          (*deposits[j])[source]);
    }
    else
      anElectron.setIsoDeposit(isoDepositLabels_[j].first,
                          (*deposits[j])[elecRef]);
  }

  for (size_t j = 0; j<isolationValues.size(); ++j) {
    if(useParticleFlow_) {
      reco::CandidatePtr source = anElectron.pfCandidateRef()->sourceCandidatePtr(0);
      anElectron.setIsolation(isolationValueLabels_[j].first,
                         (*isolationValues[j])[source]);
    }
    else
      anElectron.setIsolation(isolationValueLabels_[j].first,
                         (*isolationValues[j])[elecRef]);
  }



}

void PATElectronProducer::fillElectron2( Electron& anElectron,
                                         const reco::CandidatePtr& candPtrForIsolation,
                                         const reco::CandidatePtr& candPtrForGenMatch,
                                         const reco::CandidatePtr& candPtrForLoader,
                                         const GenAssociations& genMatches,
                                         const IsoDepositMaps& deposits,
                                         const IsolationValueMaps& isolationValues) const {

  //COLIN/Florian: use the PFCandidate 4-mom.
  anElectron.setEcalDrivenMomentum(anElectron.p4()) ;
  anElectron.setP4( anElectron.pfCandidateRef()->p4() );


  // is the concrete elecRef needed for the efficiency loader? what is this loader?
  // how can we make it compatible with the particle flow electrons?

  if (embedGsfElectronCore_) anElectron.embedGsfElectronCore();
  if (embedGsfTrack_) anElectron.embedGsfTrack();
  if (embedSuperCluster_) anElectron.embedSuperCluster();
  if (embedTrack_) anElectron.embedTrack();

  // store the match to the generated final state muons

  if (addGenMatch_) {
    for(size_t i = 0, n = genMatches.size(); i < n; ++i) {
      reco::GenParticleRef genElectron = (*genMatches[i])[candPtrForGenMatch];
      anElectron.addGenParticleRef(genElectron);
    }
    if (embedGenMatch_) anElectron.embedGenParticle();
  }

  //COLIN what's this? does it have to be GsfElectron specific?
  if (efficiencyLoader_.enabled()) {
    efficiencyLoader_.setEfficiencies( anElectron, candPtrForLoader );
  }

  if (resolutionLoader_.enabled()) {
    resolutionLoader_.setResolutions(anElectron);
  }

  for (size_t j = 0, nd = deposits.size(); j < nd; ++j) {
    if( isoDepositLabels_[j].first==pat::TrackIso ||
        isoDepositLabels_[j].first==pat::EcalIso ||
        isoDepositLabels_[j].first==pat::HcalIso ) {

      anElectron.setIsoDeposit(isoDepositLabels_[j].first,
                               (*deposits[j])[candPtrForGenMatch]);
    }
    else if (deposits[j]->contains(candPtrForIsolation.id())) {
      anElectron.setIsoDeposit(isoDepositLabels_[j].first,
                               (*deposits[j])[candPtrForIsolation]);
    }
    else {
      anElectron.setIsoDeposit(isoDepositLabels_[j].first,
                               (*deposits[j])[candPtrForIsolation->sourceCandidatePtr(0)]);
    }
  }

  for (size_t j = 0; j<isolationValues.size(); ++j) {
    if( isolationValueLabels_[j].first==pat::TrackIso ||
        isolationValueLabels_[j].first==pat::EcalIso ||
        isolationValueLabels_[j].first==pat::HcalIso ) {
      anElectron.setIsolation(isolationValueLabels_[j].first,
                              (*isolationValues[j])[candPtrForGenMatch]);
    }
    else if (isolationValues[j]->contains(candPtrForIsolation.id())) {
      anElectron.setIsolation(isolationValueLabels_[j].first,
                              (*isolationValues[j])[candPtrForIsolation]);
    }
    else {
      anElectron.setIsolation(isolationValueLabels_[j].first,
                              (*isolationValues[j])[candPtrForIsolation->sourceCandidatePtr(0)]);
    }
    
  }
}


// ParameterSet description for module
void PATElectronProducer::fillDescriptions(edm::ConfigurationDescriptions & descriptions)
{
  edm::ParameterSetDescription iDesc;
  iDesc.setComment("PAT electron producer module");

  // input source
  iDesc.add<edm::InputTag>("electronSource", edm::InputTag("no default"))->setComment("input collection");

  // embedding
  iDesc.add<bool>("embedGsfElectronCore", true)->setComment("embed external gsf electron core");
  iDesc.add<bool>("embedGsfTrack", true)->setComment("embed external gsf track");
  iDesc.add<bool>("embedSuperCluster", true)->setComment("embed external super cluster");
  iDesc.add<bool>("embedTrack", false)->setComment("embed external track");

  // pf specific parameters
  iDesc.add<edm::InputTag>("pfElectronSource", edm::InputTag("pfElectrons"))->setComment("particle flow input collection");
  iDesc.add<bool>("useParticleFlow", false)->setComment("whether to use particle flow or not");
  iDesc.add<edm::InputTag>("linkToPFSource", edm::InputTag())->setComment("alternative PF collection to link to (pfCandidateRef) -- traverses inheritance chain up to this");
  iDesc.add<bool>("embedPFCandidate", false)->setComment("embed external particle flow object");

  // MC matching configurables
  iDesc.add<bool>("addGenMatch", true)->setComment("add MC matching");
  iDesc.add<bool>("embedGenMatch", false)->setComment("embed MC matched MC information");
  std::vector<edm::InputTag> emptySourceVector;
  iDesc.addNode( edm::ParameterDescription<edm::InputTag>("genParticleMatch", edm::InputTag(), true) xor
                 edm::ParameterDescription<std::vector<edm::InputTag> >("genParticleMatch", emptySourceVector, true)
                 )->setComment("input with MC match information");

  // electron ID configurables
  iDesc.add<bool>("addElectronID",true)->setComment("add electron ID variables");
  edm::ParameterSetDescription electronIDSourcesPSet;
  electronIDSourcesPSet.setAllowAnything();
  iDesc.addNode( edm::ParameterDescription<edm::InputTag>("electronIDSource", edm::InputTag(), true) xor
                 edm::ParameterDescription<edm::ParameterSetDescription>("electronIDSources", electronIDSourcesPSet, true)
                 )->setComment("input with electron ID variables");


  // IsoDeposit configurables
  edm::ParameterSetDescription isoDepositsPSet;
  isoDepositsPSet.addOptional<edm::InputTag>("tracker");
  isoDepositsPSet.addOptional<edm::InputTag>("ecal");
  isoDepositsPSet.addOptional<edm::InputTag>("hcal");
  isoDepositsPSet.addOptional<edm::InputTag>("pfAllParticles");
  isoDepositsPSet.addOptional<edm::InputTag>("pfChargedHadrons");
  isoDepositsPSet.addOptional<edm::InputTag>("pfNeutralHadrons");
  isoDepositsPSet.addOptional<edm::InputTag>("pfPhotons");
  isoDepositsPSet.addOptional<std::vector<edm::InputTag> >("user");
  iDesc.addOptional("isoDeposits", isoDepositsPSet);

  // isolation values configurables
  edm::ParameterSetDescription isolationValuesPSet;
  isolationValuesPSet.addOptional<edm::InputTag>("tracker");
  isolationValuesPSet.addOptional<edm::InputTag>("ecal");
  isolationValuesPSet.addOptional<edm::InputTag>("hcal");
  isolationValuesPSet.addOptional<edm::InputTag>("pfAllParticles");
  isolationValuesPSet.addOptional<edm::InputTag>("pfChargedHadrons");
  isolationValuesPSet.addOptional<edm::InputTag>("pfNeutralHadrons");
  isolationValuesPSet.addOptional<edm::InputTag>("pfPhotons");
  isolationValuesPSet.addOptional<std::vector<edm::InputTag> >("user");
  iDesc.addOptional("isolationValues", isolationValuesPSet);

  // Efficiency configurables
  edm::ParameterSetDescription efficienciesPSet;
  efficienciesPSet.setAllowAnything(); // TODO: the pat helper needs to implement a description.
  iDesc.add("efficiencies", efficienciesPSet);
  iDesc.add<bool>("addEfficiencies", false);

  // Check to see if the user wants to add user data
  edm::ParameterSetDescription userDataPSet;
  PATUserDataHelper<Electron>::fillDescription(userDataPSet);
  iDesc.addOptional("userData", userDataPSet);

  // electron shapes
  iDesc.add<bool>("addElectronShapes", true);
  iDesc.add<edm::InputTag>("reducedBarrelRecHitCollection", edm::InputTag("reducedEcalRecHitsEB"));
  iDesc.add<edm::InputTag>("reducedEndcapRecHitCollection", edm::InputTag("reducedEcalRecHitsEE"));

  edm::ParameterSetDescription isolationPSet;
  isolationPSet.setAllowAnything(); // TODO: the pat helper needs to implement a description.
  iDesc.add("userIsolation", isolationPSet);

  // Resolution configurables
  pat::helper::KinResolutionsLoader::fillDescription(iDesc);

  iDesc.add<bool>("embedHighLevelSelection", true)->setComment("embed high level selection");
  edm::ParameterSetDescription highLevelPSet;
  highLevelPSet.setAllowAnything();
  iDesc.addNode( edm::ParameterDescription<edm::InputTag>("beamLineSrc", edm::InputTag(), true)
                 )->setComment("input with high level selection");
  iDesc.addNode( edm::ParameterDescription<edm::InputTag>("pvSrc", edm::InputTag(), true)
                 )->setComment("input with high level selection");
  iDesc.addNode( edm::ParameterDescription<bool>("usePV", bool(), true)
                 )->setComment("input with high level selection, use primary vertex (true) or beam line (false)");

  descriptions.add("PATElectronProducer", iDesc);

}



void PATElectronProducer::readIsolationLabels( const edm::ParameterSet & iConfig,
                                               const char* psetName,
                                               IsolationLabels& labels) {

  labels.clear();

  if (iConfig.exists( psetName )) {
    edm::ParameterSet depconf
      = iConfig.getParameter<edm::ParameterSet>(psetName);

    if (depconf.exists("tracker")) labels.push_back(std::make_pair(pat::TrackIso, depconf.getParameter<edm::InputTag>("tracker")));
    if (depconf.exists("ecal"))    labels.push_back(std::make_pair(pat::EcalIso, depconf.getParameter<edm::InputTag>("ecal")));
    if (depconf.exists("hcal"))    labels.push_back(std::make_pair(pat::HcalIso, depconf.getParameter<edm::InputTag>("hcal")));
    if (depconf.exists("pfAllParticles"))  {
      labels.push_back(std::make_pair(pat::PfAllParticleIso, depconf.getParameter<edm::InputTag>("pfAllParticles")));
    }
    if (depconf.exists("pfChargedHadrons"))  {
      labels.push_back(std::make_pair(pat::PfChargedHadronIso, depconf.getParameter<edm::InputTag>("pfChargedHadrons")));
    }
    if (depconf.exists("pfNeutralHadrons"))  {
      labels.push_back(std::make_pair(pat::PfNeutralHadronIso, depconf.getParameter<edm::InputTag>("pfNeutralHadrons")));
    }
    if (depconf.exists("pfPhotons")) {
      labels.push_back(std::make_pair(pat::PfGammaIso, depconf.getParameter<edm::InputTag>("pfPhotons")));
    }
    if (depconf.exists("user")) {
      std::vector<edm::InputTag> userdeps = depconf.getParameter<std::vector<edm::InputTag> >("user");
      std::vector<edm::InputTag>::const_iterator it = userdeps.begin(), ed = userdeps.end();
      int key = UserBaseIso;
      for ( ; it != ed; ++it, ++key) {
        labels.push_back(std::make_pair(IsolationKeys(key), *it));
      }
    }
  }


}


// embed various impact parameters with errors
// embed high level selection
void PATElectronProducer::embedHighLevel( pat::Electron & anElectron, 
                                          reco::GsfTrackRef track,
                                          reco::TransientTrack & tt,
                                          reco::Vertex & primaryVertex,
                                          bool primaryVertexIsValid,
                                          reco::BeamSpot & beamspot,
                                          bool beamspotIsValid
                                          )
{
  // Correct to PV

  // PV2D
  std::pair<bool,Measurement1D> result =
    IPTools::signedTransverseImpactParameter(tt,
                                             GlobalVector(track->px(),
                                                          track->py(),
                                                          track->pz()),
                                             primaryVertex); 
  double d0_corr = result.second.value();
  double d0_err = primaryVertexIsValid ? result.second.error() : -1.0;
  anElectron.setDB( d0_corr, d0_err, pat::Electron::PV2D);


  // PV3D
  result =
    IPTools::signedImpactParameter3D(tt,
                                     GlobalVector(track->px(),
                                                  track->py(),
                                                  track->pz()),
                                     primaryVertex);
  d0_corr = result.second.value();
  d0_err = primaryVertexIsValid ? result.second.error() : -1.0;
  anElectron.setDB( d0_corr, d0_err, pat::Electron::PV3D);
  

  // Correct to beam spot
  // make a fake vertex out of beam spot
  reco::Vertex vBeamspot(beamspot.position(), beamspot.covariance3D());
  
  // BS2D
  result =
    IPTools::signedTransverseImpactParameter(tt,
                                             GlobalVector(track->px(),
                                                          track->py(),
                                                          track->pz()),
                                             vBeamspot);
  d0_corr = result.second.value();
  d0_err = beamspotIsValid ? result.second.error() : -1.0;
  anElectron.setDB( d0_corr, d0_err, pat::Electron::BS2D);
  
  // BS3D
  result =
    IPTools::signedImpactParameter3D(tt,
                                     GlobalVector(track->px(),
                                                  track->py(),
                                                  track->pz()),
                                     vBeamspot);
  d0_corr = result.second.value();
  d0_err = beamspotIsValid ? result.second.error() : -1.0;
  anElectron.setDB( d0_corr, d0_err, pat::Electron::BS3D);
}

#include "FWCore/Framework/interface/MakerMacros.h"

DEFINE_FWK_MODULE(PATElectronProducer);