Assembler.hpp

#pragma once

#include <memory>
#include <tuple>

#include <dune/common/fmatrix.hh>
#include <dune/common/fvector.hh>

#include <dune/amdis/LinearAlgebra.hpp>
#include <dune/amdis/Operator.hpp>
#include <dune/amdis/common/Mpl.hpp>
#include <dune/amdis/common/TypeDefs.hpp>

namespace AMDiS
{
  template <class GlobalBasis>
  class Assembler
  {
    /// The grid view the global FE basis lives on
    using GridView = typename GlobalBasis::GridView;

  public:
    /// Constructor, stores a shared-pointer to the feSpaces
    Assembler(GlobalBasis& globalBasis,
              MatrixOperators<GlobalBasis>& matrixOperators,
              VectorOperators<GlobalBasis>& rhsOperators)
      : globalBasis_(globalBasis)
      , matrixOperators_(matrixOperators)
      , rhsOperators_(rhsOperators)
    {}

    void update(GridView const& gv)
    {
      globalBasis_.update(gv);
    }

    /// Assemble the linear system
    template <class SystemMatrixType, class SystemVectorType>
    void assemble(
        SystemMatrixType& matrix,
        SystemVectorType& solution,
        SystemVectorType& rhs,
        bool asmMatrix, bool asmVector);

  private:
    /// Sets the system to zero and initializes all operators and boundary conditions
    template <class SystemMatrixType, class SystemVectorType>
    void initMatrixVector(
        SystemMatrixType& matrix,
        SystemVectorType& solution,
        SystemVectorType& rhs,
        bool asmMatrix, bool asmVector) const;


    template <class ElementContainer, class Container, class Operators, class... Bases>
    void assembleElementOperators(
        ElementContainer& elementContainer,
        Container& container,
        Operators& operators,
        Bases const&... subBases) const;


    /// Finish insertion into the matrix and assembles boundary conditions
    /// Return the number of nonzeros assembled into the matrix
    template <class SystemMatrixType, class SystemVectorType>
    std::size_t finishMatrixVector(
        SystemMatrixType& matrix,
        SystemVectorType& solution,
        SystemVectorType& rhs,
        bool asmMatrix, bool asmVector) const;


    /// Return whether the matrix-block needs to be assembled
    template <class LocalView0, class... LovalViews>
    auto const& getElement(LocalView0 const& localView, LovalViews const&...) const
    {
      return localView.element();
    }

    /// Return whether the matrix-block needs to be assembled
    template <class LocalView0, class... LovalViews>
    auto const& getGridView(LocalView0 const& localView, LovalViews const&...) const
    {
      return globalBasis_.gridView();
    }

  private:
    GlobalBasis& globalBasis_;
    MatrixOperators<GlobalBasis>& matrixOperators_;
    VectorOperators<GlobalBasis>& rhsOperators_;
  };

} // end namespace AMDiS

#include "Assembler.inc.hpp"