/data/refman/pasoursint/CMSSW_5_2_7_hltpatch2/src/CommonTools/ParticleFlow/interface/IsolatedPFCandidateSelectorDefinition.h

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#ifndef CommonTools_ParticleFlow_IsolatedPFCandidateSelectorDefinition
#define CommonTools_ParticleFlow_IsolatedPFCandidateSelectorDefinition

#include "DataFormats/ParticleFlowCandidate/interface/PFCandidateFwd.h"
#include "DataFormats/ParticleFlowCandidate/interface/PFCandidate.h"
#include "CommonTools/ParticleFlow/interface/PFCandidateSelectorDefinition.h"
#include "DataFormats/Common/interface/ValueMap.h"
#include "FWCore/Utilities/interface/Exception.h"

namespace pf2pat {

  class IsolatedPFCandidateSelectorDefinition : public PFCandidateSelectorDefinition {

  public:
    typedef edm::ValueMap<double> IsoMap;

    IsolatedPFCandidateSelectorDefinition ( const edm::ParameterSet & cfg ) :
      isolationValueMapChargedLabels_(cfg.getParameter< std::vector<edm::InputTag> >("isolationValueMapsCharged") ),
      isolationValueMapNeutralLabels_(cfg.getParameter< std::vector<edm::InputTag> >("isolationValueMapsNeutral") ),
      doDeltaBetaCorrection_(cfg.getParameter<bool>("doDeltaBetaCorrection")),
      deltaBetaIsolationValueMap_(cfg.getParameter< edm::InputTag >("deltaBetaIsolationValueMap") ),
      deltaBetaFactor_(cfg.getParameter<double>("deltaBetaFactor")),
      isRelative_(cfg.getParameter<bool>("isRelative")),
      isolationCut_(cfg.getParameter<double>("isolationCut")) {}
    


    void select( const HandleToCollection & hc, 
                 const edm::EventBase & e,
                 const edm::EventSetup& s) {
      selected_.clear();
    

      // read all charged isolation value maps
      std::vector< edm::Handle<IsoMap> > 
        isoMapsCharged(isolationValueMapChargedLabels_.size());
      for(unsigned iMap = 0; iMap<isolationValueMapChargedLabels_.size(); ++iMap) {
        e.getByLabel(isolationValueMapChargedLabels_[iMap], isoMapsCharged[iMap]);
      }


      // read all neutral isolation value maps
      std::vector< edm::Handle<IsoMap> > 
        isoMapsNeutral(isolationValueMapNeutralLabels_.size());
      for(unsigned iMap = 0; iMap<isolationValueMapNeutralLabels_.size(); ++iMap) {
        e.getByLabel(isolationValueMapNeutralLabels_[iMap], isoMapsNeutral[iMap]);
      }

      edm::Handle<IsoMap> dBetaH;
      if(doDeltaBetaCorrection_) {
        e.getByLabel(deltaBetaIsolationValueMap_, dBetaH);
      }

      unsigned key=0;
      for( collection::const_iterator pfc = hc->begin(); 
           pfc != hc->end(); ++pfc, ++key) {
        reco::PFCandidateRef candidate(hc,key);

        bool passed = true;
        double isoSumCharged=0.0;
        double isoSumNeutral=0.0;

        for(unsigned iMap = 0; iMap<isoMapsCharged.size(); ++iMap) {
          const IsoMap & isoMap = *(isoMapsCharged[iMap]);
          double val = isoMap[candidate];
          isoSumCharged+=val;
        }

        for(unsigned iMap = 0; iMap<isoMapsNeutral.size(); ++iMap) {
          const IsoMap & isoMap = *(isoMapsNeutral[iMap]);
          double val = isoMap[candidate];
          isoSumNeutral+=val;
        }
        

        if ( doDeltaBetaCorrection_ ) {
          const IsoMap& isoMap = *dBetaH;
          double dBetaVal = isoMap[candidate];
          double dBetaCorIsoSumNeutral = isoSumNeutral + deltaBetaFactor_*dBetaVal; 
          isoSumNeutral = dBetaCorIsoSumNeutral>0 ? dBetaCorIsoSumNeutral : isoSumNeutral;
        }

        double isoSum=isoSumCharged+isoSumNeutral;

        if( isRelative_ ) {
          isoSum /= candidate->pt();
        }

        if ( isoSum>isolationCut_ ) {
          passed = false;
        }

        if(passed) {
          // passed all cuts, selected
          selected_.push_back( reco::PFCandidate(*pfc) );
          reco::PFCandidatePtr ptrToMother( hc, key );
          selected_.back().setSourceCandidatePtr( ptrToMother );
        }
      }
    }
    

  private:
    std::vector<edm::InputTag> isolationValueMapChargedLabels_;
    std::vector<edm::InputTag> isolationValueMapNeutralLabels_;
    bool                       doDeltaBetaCorrection_;
    edm::InputTag              deltaBetaIsolationValueMap_;
    double                     deltaBetaFactor_;
    bool                       isRelative_; 
    double                     isolationCut_;
  };

}

#endif