PhotonMappingIdentityTransformations.h

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#ifndef LARSIM_PHOTONPROPAGATION_LIBRARYMAPPINGTOOLS_PHOTONMAPPINGIDENTITYTRANSFORMATIONS_H
#define LARSIM_PHOTONPROPAGATION_LIBRARYMAPPINGTOOLS_PHOTONMAPPINGIDENTITYTRANSFORMATIONS_H

// LArSoft libraries
#include "larcore/CoreUtils/ServiceUtil.h" // lar::providerFrom()
#include "larcore/Geometry/Geometry.h"
#include "larcoreobj/SimpleTypesAndConstants/geo_vectors.h"
#include "larsim/PhotonPropagation/LibraryMappingTools/IPhotonMappingTransformations.h"

// framework libraries
#include "art/Utilities/ToolConfigTable.h"

namespace geo {
  class GeometryCore;
}

namespace phot {

  class PhotonMappingIdentityTransformations : public phot::IPhotonMappingTransformations {

  public:
    struct Config {

      //   using Name = fhicl::Name;
      //   using Comment = fhicl::Comment;

      // no configuration required

    }; // struct Config

    using Parameters = art::ToolConfigTable<Config>;

    PhotonMappingIdentityTransformations(Config const&)
      : fGeom(lar::providerFrom<geo::Geometry>())
      , fOpDetsToLibraryIndicesMap(makeOpDetsToLibraryIndicesMap())
      , fLibraryIndicesToOpDetsMap(makeLibraryIndicesToOpDetsMap())
    {}

    PhotonMappingIdentityTransformations(Parameters const& config)
      : PhotonMappingIdentityTransformations(config())
    {}

    // --- BEGIN Geometry mapping interface ------------------------------------

    geo::Point_t detectorToLibrary(geo::Point_t const& location) const override { return location; }

    // --- END Geometry mapping interface --------------------------------------

    // --- BEGIN Optical detector mapping interface ----------------------------

    LibraryIndex_t opDetToLibraryIndex(geo::Point_t const& location,
                                       OpDetID_t opDetID) const override
    {
      return LibraryIndex_t{opDetID};
    }

    OpDetID_t libraryIndexToOpDet(geo::Point_t const& location,
                                  LibraryIndex_t libIndex) const override
    {
      return OpDetID_t{libIndex};
    }

    OpDetToLibraryIndexMap const& opDetsToLibraryIndices(
      geo::Point_t const& location) const override
    {
      return fOpDetsToLibraryIndicesMap;
    }

    std::size_t opDetMappingSize() const override { return fOpDetsToLibraryIndicesMap.size(); }

    LibraryIndexToOpDetMap const& libraryIndicesToOpDets(
      geo::Point_t const& location) const override
    {
      return fLibraryIndicesToOpDetsMap;
    }

    std::size_t libraryMappingSize(geo::Point_t const& location) const override
    {
      return fLibraryIndicesToOpDetsMap.size();
    }

    // --- END Optical detector identifier mapping interface -------------------

  protected:
    geo::GeometryCore const* fGeom = nullptr;

    OpDetToLibraryIndexMap fOpDetsToLibraryIndicesMap;

    LibraryIndexToOpDetMap fLibraryIndicesToOpDetsMap;

    LibraryIndexToOpDetMap makeLibraryIndicesToOpDetsMap() const;

    OpDetToLibraryIndexMap makeOpDetsToLibraryIndicesMap() const;

  }; // class PhotonMappingIdentityTransformations

} // namespace phot

#endif // LARSIM_PHOTONPROPAGATION_LIBRARYMAPPINGTOOLS_PHOTONMAPPINGIDENTITYTRANSFORMATIONS_H