CaloConeSelector.h

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#ifndef RECOCALOTOOLS_SELECTORS_CALOCONESELECTOR_H
#define RECOCALOTOOLS_SELECTORS_CALOCONESELECTOR_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 CaloConeSelector {
public:
  CaloConeSelector(double dR, const CaloGeometry* geom) :
    geom_(geom),deltaR_(dR),detector_(DetId::Detector(0)),subdet_(0) {}

  CaloConeSelector(double dR, const CaloGeometry* geom, DetId::Detector detector, int subdet=0) :
    geom_(geom),deltaR_(dR),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!=nullptr) {
        // get the list of detids within range (from geometry)
        CaloSubdetectorGeometry::DetIdSet dis=sdg->getCells(p,deltaR_);
        // 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 deltaR_;
  DetId::Detector detector_;
  int subdet_;
};

#endif