CaloDualConeSelector.h

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#ifndef RECOCALOTOOLS_SELECTORS_CALODUALCONESELECTOR_H
#define RECOCALOTOOLS_SELECTORS_CALODUALCONESELECTOR_H 1

#include "Geometry/CaloGeometry/interface/CaloGeometry.h"
#include "DataFormats/Common/interface/SortedCollection.h"
#include "Geometry/CaloGeometry/interface/CaloSubdetectorGeometry.h"
#include <memory>

template <class T>
class CaloDualConeSelector {
public:
  CaloDualConeSelector(double dRmin, double dRmax, const CaloGeometry* geom) :
    geom_(geom),deltaRmin_(dRmin),deltaRmax_(dRmax),detector_(DetId::Detector(0)),subdet_(0) {}
  
  CaloDualConeSelector(double dRmin, double dRmax, const CaloGeometry* geom, DetId::Detector detector, int subdet=0) : 
    geom_(geom),deltaRmin_(dRmin),deltaRmax_(dRmax),detector_(detector),subdet_(subdet) {}

  void inline selectCallback(double eta, double phi, const edm::SortedCollection<T>& inputCollection, std::function<void(const T&)> callback) {
    GlobalPoint p(GlobalPoint::Cylindrical(1,phi,tanh(eta)));
    return selectCallback(p, inputCollection, callback);
  }

  void inline selectCallback(const GlobalPoint& p, const edm::SortedCollection<T>& inputCollection, std::function<void(const T&)> callback) {
    // TODO: handle default setting of detector_ (loops over subdet)
    // TODO: heuristics of when it is better to loop over inputCollection instead (small # hits)
    for (int subdet=subdet_; subdet<=7 && (subdet_==0 || subdet_==subdet); subdet++) {
      const CaloSubdetectorGeometry* sdg=geom_->getSubdetectorGeometry(detector_,subdet);
      if (sdg!=0) {
        // get the list of detids within range (from geometry)
        CaloSubdetectorGeometry::DetIdSet dis_excl=sdg->getCells(p,deltaRmin_);
        CaloSubdetectorGeometry::DetIdSet dis_all=sdg->getCells(p,deltaRmax_);
        // use set operations to determine detids in annulus
        CaloSubdetectorGeometry::DetIdSet dis;
        std::set_difference(dis_all.begin(),dis_all.end(),
                dis_excl.begin(),dis_excl.end(),
                std::inserter(dis,dis.begin()));

        // loop over detids...
        typename edm::SortedCollection<T>::const_iterator j, je = inputCollection.end();      

        for (CaloSubdetectorGeometry::DetIdSet::iterator i=dis.begin(); i!=dis.end(); i++) {
          if (i->subdetId()!=subdet) continue; // possible for HCAL where the same geometry object handles all the detectors
          j=inputCollection.find(*i);
          if (j!=je) callback(*j);
        }
      }    
    }
  }

private:
  const CaloGeometry* geom_;
  double deltaRmin_,deltaRmax_;
  DetId::Detector detector_;
  int subdet_;
};

#endif