/data/refman/pasoursint/CMSSW_5_3_4/src/RecoTauTag/RecoTau/plugins/RecoTauIsolationDiscriminantPlugins.cc

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#include <boost/foreach.hpp>
#include "RecoTauTag/RecoTau/interface/RecoTauBinnedIsolationPlugin.h"
#include "RecoTauTag/RecoTau/interface/RecoTauIsolationMasking.h"

namespace reco { namespace tau {

template<class Extractor>
class RecoTauDiscriminationBinnedIsolationImpl
: public RecoTauDiscriminationBinnedIsolation {
  public:
    RecoTauDiscriminationBinnedIsolationImpl(const edm::ParameterSet& pset)
      :RecoTauDiscriminationBinnedIsolation(pset),extractor_(pset) {}
    reco::PFCandidateRefVector extractIsoObjects(
        const reco::PFTauRef& tau) const {
      return extractor_(tau);
    }
  private:
    Extractor extractor_;
};

}} // end namespace reco::tau


// Methods to get the right kind of canddiates
namespace {

class TrackExtractor {
  public:
    TrackExtractor(const edm::ParameterSet& pset){};
    reco::PFCandidateRefVector operator()(const reco::PFTauRef& tau) const {
      return tau->isolationPFChargedHadrCands();
    }
};

class ECALExtractor {
  public:
    ECALExtractor(const edm::ParameterSet& pset){};
    reco::PFCandidateRefVector operator()(const reco::PFTauRef& tau) const {
      return tau->isolationPFGammaCands();
    }
};

class MaskedECALExtractor {
  public:
    MaskedECALExtractor(const edm::ParameterSet& pset)
      :mask_(pset.getParameter<edm::ParameterSet>("mask")){};
    reco::PFCandidateRefVector operator()(const reco::PFTauRef& tau) const {
      reco::PFCandidateRefVector output;
      reco::tau::RecoTauIsolationMasking::IsoMaskResult
        result = mask_.mask(*tau);
      output.reserve(result.gammas.size());
      BOOST_FOREACH(const reco::PFCandidateRef gamma, result.gammas) {
        output.push_back(gamma);
      }
      return output;
    }
  private:
    reco::tau::RecoTauIsolationMasking mask_;
};

class HCALExtractor {
  public:
    HCALExtractor(const edm::ParameterSet& pset){};
    reco::PFCandidateRefVector operator()(const reco::PFTauRef& tau) const {
      return tau->isolationPFNeutrHadrCands();
    }
};

class MaskedHCALExtractor {
  public:
    MaskedHCALExtractor(const edm::ParameterSet& pset)
      :mask_(pset.getParameter<edm::ParameterSet>("mask")){};
    reco::PFCandidateRefVector operator()(const reco::PFTauRef& tau) const {
      reco::PFCandidateRefVector output;
      reco::tau::RecoTauIsolationMasking::IsoMaskResult
        result = mask_.mask(*tau);
      output.reserve(result.h0s.size());
      BOOST_FOREACH(const reco::PFCandidateRef h0, result.h0s) {
        output.push_back(h0);
      }
      return output;
    }
  private:
    reco::tau::RecoTauIsolationMasking mask_;
};
}

#include "FWCore/Framework/interface/MakerMacros.h"
DEFINE_EDM_PLUGIN(RecoTauDiscriminantPluginFactory,
    reco::tau::RecoTauDiscriminationBinnedIsolationImpl<TrackExtractor>,
    "RecoTauDiscriminationBinnedTrackIsolation");
DEFINE_EDM_PLUGIN(RecoTauDiscriminantPluginFactory,
    reco::tau::RecoTauDiscriminationBinnedIsolationImpl<ECALExtractor>,
    "RecoTauDiscriminationBinnedECALIsolation");
DEFINE_EDM_PLUGIN(RecoTauDiscriminantPluginFactory,
    reco::tau::RecoTauDiscriminationBinnedIsolationImpl<MaskedECALExtractor>,
    "RecoTauDiscriminationBinnedMaskedECALIsolation");
DEFINE_EDM_PLUGIN(RecoTauDiscriminantPluginFactory,
    reco::tau::RecoTauDiscriminationBinnedIsolationImpl<HCALExtractor>,
    "RecoTauDiscriminationBinnedHCALIsolation");
DEFINE_EDM_PLUGIN(RecoTauDiscriminantPluginFactory,
    reco::tau::RecoTauDiscriminationBinnedIsolationImpl<MaskedHCALExtractor>,
    "RecoTauDiscriminationBinnedMaskedHCALIsolation");