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#include <algorithm>
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#include <vector>
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#include "FWCore/Framework/interface/EDProducer.h"
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#include "FWCore/ParameterSet/interface/ParameterSetfwd.h"
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#include "FWCore/ParameterSet/interface/ParameterSet.h"
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#include "PhysicsTools/Utilities/interface/Math.h"
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#include "DataFormats/TrackReco/interface/Track.h"
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#include "FWCore/Framework/interface/EventSetup.h"
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#include "FWCore/Framework/interface/Event.h"
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#include "FWCore/Framework/interface/ESHandle.h"
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#include "DataFormats/Common/interface/Handle.h"
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#include <TObjArray.h>
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#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
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#include "DataFormats/GeometryVector/interface/GlobalVector.h"
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#include "PhysicsTools/LeptonIsolation/interface/PropagateToCal.h"
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template <typename T1, typename C2>
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class CalIsolationAlgo {
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public:
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typedef double value_type;
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CalIsolationAlgo( const edm::ParameterSet & );
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~CalIsolationAlgo();
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double operator()(const T1 &, const C2 &, const edm::EventSetup &) const;
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private:
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double dRMin_, dRMax_, dzMax_;
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bool do_propagation_;
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PropagateToCal SrcAtCal;
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};
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template <typename T1, typename C2>
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CalIsolationAlgo<T1,C2>::CalIsolationAlgo( const edm::ParameterSet & cfg ) :
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dRMin_( cfg.template getParameter<double>( "dRMin" ) ),
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dRMax_( cfg.template getParameter<double>( "dRMax" ) ),
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do_propagation_( cfg.template getParameter<bool>( "PropagateToCal" ) ),
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SrcAtCal(cfg)///class to propagate particles from the vertex to the calorimeter
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{
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}
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template <typename T1, typename C2>
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CalIsolationAlgo<T1,C2>::~CalIsolationAlgo() {
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}
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template <typename T1, typename C2> double CalIsolationAlgo<T1,C2>::
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operator()(const T1 & cand, const C2 & elements, const edm::EventSetup &iSetup) const {
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const GlobalPoint Vertex(cand.vx(), cand.vy(), cand.vz());//@@check if this is [cm]!
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GlobalVector Cand(cand.pt(), cand.eta(), cand.phi());
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///Extrapolate charged particles from their vertex to the point of entry into the
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///calorimeter, if this is requested in the cfg file.
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if (do_propagation_ && cand.charge()!=0)
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SrcAtCal.propagate(Vertex, Cand, cand.charge(), iSetup);
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double etSum = 0;
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for( typename C2::const_iterator elem = elements.begin();
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elem != elements.end(); ++elem ) {
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double dR = deltaR( elem->eta(), elem->phi(),
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(double)Cand.eta(), (double)Cand.phi() );
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if ( dR < dRMax_ && dR > dRMin_ ) {
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etSum += elem->et();
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}
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}
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return etSum;
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}
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