NewMatcher.h

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#ifndef UtilAlgos_NewMatcher_h
#define UtilAlgos_NewMatcher_h
/* \class Matcher
 *
 * \author Luca Lista, INFN
 *
 */
#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "CommonTools/UtilAlgos/interface/DeltaR.h"
#include "CommonTools/UtilAlgos/interface/MasterCollectionHelper.h"
#include "FWCore/Framework/interface/Event.h"
#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/Common/interface/Association.h"
#include "DataFormats/Common/interface/getRef.h"
#include "DataFormats/Common/interface/View.h"

namespace reco {
  namespace modulesNew {

    template <typename C1, typename C2, typename S, typename D = DeltaR<typename C1::value_type, typename C2::value_type> >
    class Matcher : public edm::EDProducer {
    public:
      Matcher(const edm::ParameterSet& cfg);
      ~Matcher() override;

    private:
      typedef typename C1::value_type T1;
      typedef typename C2::value_type T2;
      typedef edm::Association<C2> MatchMap;
      void produce(edm::Event&, const edm::EventSetup&) override;
      edm::EDGetTokenT<C1> srcToken_;
      edm::EDGetTokenT<C2> matchedToken_;
      double distMin_;
      double matchDistance(const T1& c1, const T2& c2) const { return distance_(c1, c2); }
      bool select(const T1& c1, const T2& c2) const { return select_(c1, c2); }
      S select_;
      D distance_;
    };

    namespace helper {
      typedef std::pair<size_t, double> MatchPair;

      struct SortBySecond {
        bool operator()(const MatchPair& p1, const MatchPair& p2) const { return p1.second < p2.second; }
      };
    }  // namespace helper

    template <typename C1, typename C2, typename S, typename D>
    Matcher<C1, C2, S, D>::Matcher(const edm::ParameterSet& cfg)
        : srcToken_(consumes<C1>(cfg.template getParameter<edm::InputTag>("src"))),
          matchedToken_(consumes<C2>(cfg.template getParameter<edm::InputTag>("matched"))),
          distMin_(cfg.template getParameter<double>("distMin")),
          select_(reco::modules::make<S>(cfg)),
          distance_(reco::modules::make<D>(cfg)) {
      produces<MatchMap>();
    }

    template <typename C1, typename C2, typename S, typename D>
    Matcher<C1, C2, S, D>::~Matcher() {}

    template <typename C1, typename C2, typename S, typename D>
    void Matcher<C1, C2, S, D>::produce(edm::Event& evt, const edm::EventSetup&) {
      using namespace edm;
      using namespace std;
      Handle<C2> matched;
      evt.getByToken(matchedToken_, matched);
      Handle<C1> cands;
      evt.getByToken(srcToken_, cands);
      unique_ptr<MatchMap> matchMap(new MatchMap(matched));
      size_t size = cands->size();
      if (size != 0) {
        typename MatchMap::Filler filler(*matchMap);
        ::helper::MasterCollection<C1> master(cands, evt);
        std::vector<int> indices(master.size(), -1);
        for (size_t c = 0; c != size; ++c) {
          const T1& cand = (*cands)[c];
          vector<helper::MatchPair> v;
          for (size_t m = 0; m != matched->size(); ++m) {
            const T2& match = (*matched)[m];
            if (select(cand, match)) {
              double dist = matchDistance(cand, match);
              if (dist < distMin_)
                v.push_back(make_pair(m, dist));
            }
          }
          if (!v.empty()) {
            size_t idx = master.index(c);
            assert(idx < indices.size());
            indices[idx] = min_element(v.begin(), v.end(), helper::SortBySecond())->first;
          }
        }
        filler.insert(master.get(), indices.begin(), indices.end());
        filler.fill();
      }
      evt.put(std::move(matchMap));
    }

  }  // namespace modulesNew
}  // namespace reco

#endif