Zoltan2_BasicKokkosIdentifierAdapter.hpp

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#ifndef _ZOLTAN2_BASICKOKKOSIDENTIFIERADAPTER_HPP_
#define _ZOLTAN2_BASICKOKKOSIDENTIFIERADAPTER_HPP_

#include <Kokkos_Core.hpp>
#include <Zoltan2_IdentifierAdapter.hpp>
#include <Zoltan2_StridedData.hpp>

using Kokkos::ALL;

namespace Zoltan2 {

template <typename User>
  class BasicKokkosIdentifierAdapter: public IdentifierAdapter<User> {

public:
  typedef typename InputTraits<User>::scalar_t scalar_t;
  typedef typename InputTraits<User>::lno_t    lno_t;
  typedef typename InputTraits<User>::gno_t    gno_t;
  typedef typename InputTraits<User>::part_t   part_t;
  typedef typename InputTraits<User>::node_t   node_t;
  typedef User user_t;
  typedef Kokkos::LayoutLeft weight_layout_t;

  BasicKokkosIdentifierAdapter(Kokkos::View<gno_t*> &ids,
                            Kokkos::View<scalar_t**, weight_layout_t> &weights);

  // The Adapter interface.

  size_t getLocalNumIDs() const { return idsView_.extent(0); }

  void getIDsKokkosView(Kokkos::View<gno_t *> &ids) const {ids = idsView_;}

  int getNumWeightsPerID() const { return weightsView_.extent(1); }

  void getWeightsKokkosView(Kokkos::View<scalar_t *> &wgt, int idx = 0) const {
    if (idx < 0 || scalar_t(idx) >= weightsView_.extent(0)) {
      std::ostringstream emsg;
      emsg << __FILE__ << ":" << __LINE__
           << "  Invalid weight index " << idx << std::endl;
      throw std::runtime_error(emsg.str());
    }
    wgt = Kokkos::subview(weightsView_, ALL, idx);
  }

private:
  Kokkos::View<gno_t *> idsView_;
  Kokkos::View<scalar_t **, weight_layout_t> weightsView_;
};

// Definitions

template <typename User>
  BasicKokkosIdentifierAdapter<User>::BasicKokkosIdentifierAdapter(
    Kokkos::View<gno_t*> &ids,
    Kokkos::View<scalar_t**, weight_layout_t> &weights):
      idsView_(ids), weightsView_(weights) {
}
  
} //namespace Zoltan2
  
#endif