APAHitFinder_module.cc

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////////////////////////////////////////////////////////////////////////
//
// APAHitFinder class
//
// talion@gmail.com
//
//  This algorithm is designed to find hits on APA channels after
//  deconvolution, and then disambiguate those hits, attempting to
//  localize the hit to one segment, on one side of the APA.
//
//
////////////////////////////////////////////////////////////////////////

// C/C++ standard libraries
#include <memory> // std::unique_ptr()
#include <string>
#include <utility> // std::move()

// Framework includes
#include "art/Framework/Core/EDProducer.h"
#include "art/Framework/Core/ModuleMacros.h"
#include "art/Framework/Principal/Event.h"
#include "art/Framework/Services/Registry/ServiceHandle.h"
#include "canvas/Persistency/Common/FindOneP.h"

// LArSoft Includes
#include "lardata/ArtDataHelper/HitCreator.h"
#include "lardata/DetectorInfoServices/DetectorClocksService.h"
#include "lardata/DetectorInfoServices/DetectorPropertiesService.h"
#include "lardataobj/RawData/RawDigit.h"
#include "lardataobj/RecoBase/Hit.h"
#include "lardataobj/RecoBase/Wire.h"
#include "larreco/RecoAlg/DisambigAlg.h"

namespace apa {
  class APAHitFinder : public art::EDProducer {

  public:
    explicit APAHitFinder(fhicl::ParameterSet const& pset);

  private:
    void produce(art::Event& evt) override;

    apa::DisambigAlg fDisambigAlg;
    art::ServiceHandle<geo::Geometry const> fGeom;

    std::string fChanHitLabel;

  }; // class APAHitFinder

  //-------------------------------------------------
  //-------------------------------------------------
  APAHitFinder::APAHitFinder(fhicl::ParameterSet const& pset)
    : EDProducer{pset}, fDisambigAlg(pset.get<fhicl::ParameterSet>("DisambigAlg"))
  {
    fChanHitLabel = pset.get<std::string>("ChanHitLabel");

    // let HitCollectionCreator declare that we are going to produce
    // hits and associations with wires and raw digits
    // (with no particular product label)
    recob::HitCollectionCreator::declare_products(producesCollector());
  }

  //-------------------------------------------------
  void
  APAHitFinder::produce(art::Event& evt)
  {
    // this object contains the hit collection
    // and its associations to wires and raw digits:
    recob::HitCollectionCreator hcol(evt);

    art::Handle<std::vector<recob::Hit>> ChannelHits;
    evt.getByLabel(fChanHitLabel, ChannelHits);

    // also get the associated wires and raw digits;
    // we assume they have been created by the same module as the hits
    art::FindOneP<raw::RawDigit> ChannelHitRawDigits(ChannelHits, evt, fChanHitLabel);
    art::FindOneP<recob::Wire> ChannelHitWires(ChannelHits, evt, fChanHitLabel);

    // Make unambiguous collection hits
    std::vector<art::Ptr<recob::Hit>> ChHits;
    art::fill_ptr_vector(ChHits, ChannelHits);
    for (size_t h = 0; h < ChHits.size(); h++) {
      if (ChHits[h]->View() != geo::kZ) continue;

      art::Ptr<recob::Wire> wire = ChannelHitWires.at(h);
      art::Ptr<raw::RawDigit> rawdigits = ChannelHitRawDigits.at(h);

      // just copy it
      hcol.emplace_back(*ChHits[h], wire, rawdigits);
    }

    // Run alg on all APAs
    auto const clock_data =
      art::ServiceHandle<detinfo::DetectorClocksService const>()->DataFor(evt);
    auto const det_prop =
      art::ServiceHandle<detinfo::DetectorPropertiesService const>()->DataFor(evt, clock_data);
    fDisambigAlg.RunDisambig(clock_data, det_prop, ChannelHits);

    for (size_t t = 0; t < fDisambigAlg.fDisambigHits.size(); t++) {
      art::Ptr<recob::Hit> hit = fDisambigAlg.fDisambigHits[t].first;
      geo::WireID wid = fDisambigAlg.fDisambigHits[t].second;

      // create a new hit copy of the original one, but with new wire ID
      recob::HitCreator disambiguous_hit(*hit, wid);

      // get the objects associated with the original hit;
      // since hit comes from ChannelHits, its key is the index in that collection
      // and also the index for the query of associated objects
      art::Ptr<recob::Hit>::key_type hit_index = hit.key();
      art::Ptr<recob::Wire> wire = ChannelHitWires.at(hit_index);
      art::Ptr<raw::RawDigit> rawdigits = ChannelHitRawDigits.at(hit_index);

      hcol.emplace_back(disambiguous_hit.move(), wire, rawdigits);
    } // for

    // put the hit collection and associations into the event
    hcol.put_into(evt);
  }

  DEFINE_ART_MODULE(APAHitFinder)

} // end of apa namespace