EleEnergyRetriever.h

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#ifndef RecoEgamma_EgammaTools_EleEnergyRetriever_h
#define RecoEgamma_EgammaTools_EleEnergyRetriever_h

#include "DataFormats/EgammaCandidates/interface/GsfElectron.h"
#include "FWCore/Utilities/interface/Exception.h"

class EleEnergyRetriever {
public:
  enum class EnergyType { EcalTrk, Ecal, SuperCluster, SuperClusterRaw };

  EleEnergyRetriever(const std::string& typeStr) : type_(convertFromStr(typeStr)) {}

  static EnergyType convertFromStr(const std::string& typeStr) {
    if (typeStr == "EcalTrk")
      return EnergyType::EcalTrk;
    else if (typeStr == "Ecal")
      return EnergyType::Ecal;
    else if (typeStr == "SuperCluster")
      return EnergyType::SuperCluster;
    else if (typeStr == "SuperClusterRaw")
      return EnergyType::SuperClusterRaw;
    else {
      throw cms::Exception("ConfigError")
          << " type \"" << typeStr << "\" not recognised, must be of type EcalTrk,Ecal,SuperCluster,SuperClusterRaw";
    }
  }

  float operator()(const reco::GsfElectron& ele) const {
    switch (type_) {
      case EnergyType::EcalTrk:
        return ele.energy();
      case EnergyType::Ecal:
        return ele.ecalEnergy();
      case EnergyType::SuperCluster:
        return ele.superCluster()->energy();
      case EnergyType::SuperClusterRaw:
        return ele.superCluster()->rawEnergy();
    }
    return 0.;
  }

private:
  EnergyType type_;
};

#endif