TrackFromParentImporter.h

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#ifndef __TrackFromParentImporter_H__
#define __TrackFromParentImporter_H__

#include "RecoParticleFlow/PFProducer/interface/BlockElementImporterBase.h"
#include "DataFormats/ParticleFlowReco/interface/PFBlockElementTrack.h"
#include "DataFormats/ParticleFlowReco/interface/PFRecTrackFwd.h"
#include "DataFormats/ParticleFlowReco/interface/PFRecTrack.h"

namespace pflow {
  namespace noop {
    // this adaptor class gets redefined later to match the
    // needs of the collection and importing cuts we are using
    template <class Collection>
    class ParentCollectionAdaptor {
    public:
      static bool check_importable(const typename Collection::value_type&) { return true; }
      static const std::vector<reco::PFRecTrackRef>& get_track_refs(const typename Collection::value_type&) {
        return _empty;
      }
      static void set_element_info(reco::PFBlockElement*, const typename edm::Ref<Collection>&) {}
      static const std::vector<reco::PFRecTrackRef> _empty;
    };
  }  // namespace noop
  namespace importers {
    template <class Collection, class Adaptor = noop::ParentCollectionAdaptor<Collection> >
    class TrackFromParentImporter : public BlockElementImporterBase {
    public:
      TrackFromParentImporter(const edm::ParameterSet& conf, edm::ConsumesCollector& sumes)
          : BlockElementImporterBase(conf, sumes),
            _src(sumes.consumes<Collection>(conf.getParameter<edm::InputTag>("source"))) {}

      void importToBlock(const edm::Event&, ElementList&) const override;

    private:
      edm::EDGetTokenT<Collection> _src;
    };

    template <class Collection, class Adaptor>
    void TrackFromParentImporter<Collection, Adaptor>::importToBlock(
        const edm::Event& e, BlockElementImporterBase::ElementList& elems) const {
      typedef BlockElementImporterBase::ElementList::value_type ElementType;
      auto pfparents = e.getHandle(_src);
      elems.reserve(elems.size() + 2 * pfparents->size());
      // setup our elements so that all the SCs are grouped together
      auto TKs_end = std::partition(
          elems.begin(), elems.end(), [](const ElementType& a) { return a->type() == reco::PFBlockElement::TRACK; });
      // insert tracks into the element list, updating tracks that exist already
      auto bpar = pfparents->cbegin();
      auto epar = pfparents->cend();
      edm::Ref<Collection> parentRef;
      reco::PFBlockElement* trkElem = nullptr;
      for (auto pfparent = bpar; pfparent != epar; ++pfparent) {
        if (Adaptor::check_importable(*pfparent)) {
          parentRef = edm::Ref<Collection>(pfparents, std::distance(bpar, pfparent));
          const auto& pftracks = Adaptor::get_track_refs(*pfparent);
          for (const auto& pftrack : pftracks) {
            auto tk_elem = std::find_if(
                elems.begin(), TKs_end, [&](const ElementType& a) { return (a->trackRef() == pftrack->trackRef()); });
            if (tk_elem != TKs_end) {  // if found flag the track, otherwise import
              Adaptor::set_element_info(tk_elem->get(), parentRef);
            } else {
              trkElem = new reco::PFBlockElementTrack(pftrack);
              Adaptor::set_element_info(trkElem, parentRef);
              TKs_end = elems.insert(TKs_end, ElementType(trkElem));
              ++TKs_end;
            }
          }
        }
      }  // loop on tracking coming from common parent
      elems.shrink_to_fit();
    }
  }  // namespace importers
}  // namespace pflow
#endif