ClusterDistanceFunctor.h

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/*
  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef CLUSTER_DISTANCE_FUNCTOR_H
#define CLUSTER_DISTANCE_FUNCTOR_H
 
#include "TrigObjectMatching/DistanceFunctor.h"
 
class TrigEMCluster;
class TrigElectron;
class CaloCluster;
class EmTau_ROI;

// What is the type of cluster returned by a given object?
namespace TrigMatch {
    template<class T> struct clusterTraits { typedef CaloCluster type; };
    template<> struct clusterTraits<TrigElectron> { typedef TrigEMCluster type; };
    template<> struct clusterTraits<EmTau_ROI> { typedef EmTau_ROI type; };
}
namespace ClusterDistanceHelper {
        // what the deltaR is between two clusters
        template<class T, class U>
            float deltaR(const T* t, const U* u) {
                return DeltaRDistanceFunctor<T,U>::deltaR(t, u);
            }
        // how to get the cluster for various types
        template <class T>
            const typename TrigMatch::clusterTraits<T>::type *getCluster(const T* t) { return t->cluster(); }
        inline const EmTau_ROI *getCluster(const EmTau_ROI* t) { return t; }
}

template<class T, class U>
class ClusterDistanceFunctor : public DistanceFunctor<T,U> {
 
    public:
        ClusterDistanceFunctor() { };
        virtual ~ClusterDistanceFunctor() { };
    private:
        virtual float calculateDistance(const T *t, const U *u) const {
            if(!t || !u)
                return -1.;
            return ClusterDistanceHelper::deltaR(ClusterDistanceHelper::getCluster(t), 
                                                 ClusterDistanceHelper::getCluster(u));
        }
 
};
 
#endif