space/hpdg/datahandle.hh

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#ifndef DUNE_FEM_HPDG_SPACE_DISCONTINUOUSGALERKIN_DATAHANDLE_HH
#define DUNE_FEM_HPDG_SPACE_DISCONTINUOUSGALERKIN_DATAHANDLE_HH
 
#include <cassert>
#include <cstddef>
 
#include <functional>
 
#include <dune/grid/common/datahandleif.hh>
 
namespace Dune
{
 
  namespace Fem
  {
 
    namespace hpDG
    {
 
      // External forward declaration
      // ----------------------------
 
      template< class GridPart, class LocalKeys >
      struct DiscontinuousGalerkinBlockMapper;
 
 
 
      // Internal forward declaration
      // ----------------------------
 
      template< class BlockMapper >
      class DataHandle;
 
 
 
      // DataHandle
      // ----------
 
      template< class GridPart, class LocalKeys >
      class DataHandle< DiscontinuousGalerkinBlockMapper< GridPart, LocalKeys > >
      : public Dune::CommDataHandleIF< DataHandle< DiscontinuousGalerkinBlockMapper< GridPart, LocalKeys > >, typename LocalKeys::DataType >
      {
        using ThisType = DataHandle< DiscontinuousGalerkinBlockMapper< GridPart, LocalKeys > >;
        using BaseType = Dune::CommDataHandleIF< DataHandle< DiscontinuousGalerkinBlockMapper< GridPart, LocalKeys > >, typename LocalKeys::DataType >;
 
        using BlockMapperType = DiscontinuousGalerkinBlockMapper< GridPart, LocalKeys >;
 
      public:
        using KeyType = typename LocalKeys::KeyType;
        using DataType = typename BaseType::DataType;
 
        explicit DataHandle ( BlockMapperType &blockMapper )
          : blockMapper_( blockMapper )
        {}
 
        DataHandle ( const ThisType & ) = default;
 
        ThisType &operator= ( const ThisType & ) = default;
 
        DataHandle ( ThisType && ) = default;
 
        ThisType &operator= ( ThisType && ) = default;
 
        bool contains ( int dim, int codim ) const { return (codim == 0); }
 
        bool fixedSize ( int dim, int codim ) const { return true; }
 
        template< class Entity >
        std::size_t size ( const Entity &entity ) const
        {
          return (Entity::codimension == 0 ? 1u : 0u);
        }
 
        template< class Buffer, class Entity >
        void gather ( Buffer &buffer, const Entity &entity ) const
        {
          const auto &keys = blockMapper().keys_[ entity ];
          buffer.write( encode( keys.second ) );
        }
 
        template< class Buffer, class Entity >
        void scatter ( Buffer &buffer, const Entity &entity, std::size_t n )
        {
          assert( n == 1u );
          auto &keys = blockMapper().keys_[ entity ];
          DataType data;
          buffer.read( data );
          keys.second = decode( data );
        }
 
      private:
        DataType encode ( const KeyType &key ) const { return localKeys().encode( key ); }
 
        KeyType decode ( const DataType &data ) const { return localKeys().decode( data ); }
 
        KeyType reduce ( const KeyType &a, const KeyType &b ) const { return localKeys().reduce( a, b ); }
 
        const LocalKeys &localKeys () const { return blockMapper().localKeys(); }
 
        BlockMapperType &blockMapper () { return blockMapper_.get(); }
 
        const BlockMapperType &blockMapper () const { return blockMapper_.get(); }
 
        std::reference_wrapper< BlockMapperType > blockMapper_;
      };
 
    } // namespace hpDG
 
  } // namespace Fem
 
} // namespace Dune
 
#endif // #ifndef DUNE_FEM_HPDG_SPACE_DISCONTINUOUSGALERKIN_DATAHANDLE_HH