Ifpack2_LocalFilter_decl.hpp

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//       Ifpack2: Templated Object-Oriented Algebraic Preconditioner Package
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#ifndef IFPACK2_LOCALFILTER_DECL_HPP
#define IFPACK2_LOCALFILTER_DECL_HPP

#include "Ifpack2_ConfigDefs.hpp"
#include "Ifpack2_Details_RowMatrix.hpp"
#include <type_traits>
#include <vector>


namespace Ifpack2 {

template<class MatrixType>
class LocalFilter :
    virtual public Ifpack2::Details::RowMatrix<MatrixType>,
    virtual public Teuchos::Describable
{
private:
  // Tpetra needs C++11 now because Kokkos needs C++11 now.
  // Thus, Ifpack2 needs C++11.
  static_assert (std::is_same<
                   MatrixType,
                   Tpetra::RowMatrix<
                     typename MatrixType::scalar_type,
                     typename MatrixType::local_ordinal_type,
                     typename MatrixType::global_ordinal_type,
                     typename MatrixType::node_type> >::value,
                 "Ifpack2::LocalFilter: MatrixType must be a Tpetra::RowMatrix specialization.");

public:


  typedef typename MatrixType::scalar_type scalar_type;

  typedef typename MatrixType::local_ordinal_type local_ordinal_type;

  typedef typename MatrixType::global_ordinal_type global_ordinal_type;

  typedef typename MatrixType::node_type node_type;


  typedef typename MatrixType::global_inds_host_view_type global_inds_host_view_type;
  typedef typename MatrixType::local_inds_host_view_type local_inds_host_view_type;
  typedef typename MatrixType::values_host_view_type values_host_view_type;

  typedef typename MatrixType::nonconst_global_inds_host_view_type nonconst_global_inds_host_view_type;
  typedef typename MatrixType::nonconst_local_inds_host_view_type nonconst_local_inds_host_view_type;
  typedef typename MatrixType::nonconst_values_host_view_type nonconst_values_host_view_type;


  typedef typename Teuchos::ScalarTraits<scalar_type>::magnitudeType magnitude_type;



  typedef Tpetra::RowMatrix<scalar_type,
                            local_ordinal_type,
                            global_ordinal_type,
                            node_type> row_matrix_type;

  typedef Tpetra::Map<local_ordinal_type,
                      global_ordinal_type,
                      node_type> map_type;

  typedef typename row_matrix_type::mag_type mag_type;



  virtual std::string description () const;

  virtual void
  describe (Teuchos::FancyOStream &out,
            const Teuchos::EVerbosityLevel verbLevel =
            Teuchos::Describable::verbLevel_default) const;



  explicit LocalFilter (const Teuchos::RCP<const row_matrix_type>& A);

  virtual ~LocalFilter();



  virtual Teuchos::RCP<const Teuchos::Comm<int> > getComm() const;


  virtual Teuchos::RCP<const map_type> getRowMap() const;

  virtual Teuchos::RCP<const map_type> getColMap() const;

  virtual Teuchos::RCP<const map_type> getDomainMap() const;

  virtual Teuchos::RCP<const map_type> getRangeMap() const;

  virtual Teuchos::RCP<const Tpetra::RowGraph<local_ordinal_type,global_ordinal_type,node_type> >
  getGraph () const;

  virtual global_size_t getGlobalNumRows() const;

  virtual global_size_t getGlobalNumCols() const;

  virtual size_t getLocalNumRows() const;

  virtual size_t getLocalNumCols() const;

  virtual global_ordinal_type getIndexBase() const;

  virtual global_size_t getGlobalNumEntries() const;

  virtual size_t getLocalNumEntries() const;

  virtual size_t getNumEntriesInGlobalRow (global_ordinal_type globalRow) const;

  virtual size_t getNumEntriesInLocalRow (local_ordinal_type localRow) const;

  virtual size_t getGlobalMaxNumRowEntries() const;

  virtual size_t getLocalMaxNumRowEntries() const;

  virtual bool hasColMap() const;

  virtual bool isLocallyIndexed() const;

  virtual bool isGloballyIndexed() const;

  virtual bool isFillComplete() const;

  virtual bool supportsRowViews() const;



  virtual void
  getGlobalRowCopy (global_ordinal_type GlobalRow,
                   nonconst_global_inds_host_view_type &Indices,
                   nonconst_values_host_view_type &Values,
                   size_t& NumEntries) const;

  virtual void
  getLocalRowCopy (local_ordinal_type LocalRow,
                   nonconst_local_inds_host_view_type &Indices,
                   nonconst_values_host_view_type &Values,
                   size_t& NumEntries) const;


  virtual void
  getGlobalRowView (global_ordinal_type GlobalRow,
                    global_inds_host_view_type &indices,
                    values_host_view_type &values) const;


  virtual void
  getLocalRowView (local_ordinal_type LocalRow,
    local_inds_host_view_type & indices,
    values_host_view_type & values) const;

  virtual void
  getLocalDiagCopy (Tpetra::Vector<scalar_type, local_ordinal_type, global_ordinal_type, node_type> &diag) const;



  virtual void leftScale(const Tpetra::Vector<scalar_type, local_ordinal_type, global_ordinal_type, node_type>& x);

  virtual void rightScale(const Tpetra::Vector<scalar_type, local_ordinal_type, global_ordinal_type, node_type>& x);

  virtual mag_type getFrobeniusNorm() const;

  virtual void
  apply (const Tpetra::MultiVector<scalar_type, local_ordinal_type, global_ordinal_type, node_type> &X,
         Tpetra::MultiVector<scalar_type, local_ordinal_type, global_ordinal_type, node_type> &Y,
         Teuchos::ETransp mode = Teuchos::NO_TRANS,
         scalar_type alpha = Teuchos::ScalarTraits<scalar_type>::one(),
         scalar_type beta = Teuchos::ScalarTraits<scalar_type>::zero()) const;

  virtual bool hasTransposeApply() const;

  virtual Teuchos::RCP<const row_matrix_type> getUnderlyingMatrix() const;

private:
  typedef Tpetra::RowGraph<local_ordinal_type,
                           global_ordinal_type,
                           node_type> row_graph_type;
  void
  applyNonAliased (const Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type> &X,
                   Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type> &Y,
                   Teuchos::ETransp mode,
                   scalar_type alpha,
                   scalar_type beta) const;

  static bool
  mapPairIsFitted (const map_type& map1, const map_type& map2);

  // If both pairs of Maps of the original matrix A are fitted on this
  // process, then this process can use a fast "view" implementation.
  static bool
  mapPairsAreFitted (const row_matrix_type& A);

  Teuchos::RCP<const row_matrix_type> A_;

  Teuchos::RCP<const map_type> localRowMap_;

  Teuchos::RCP<const map_type> localDomainMap_;

  Teuchos::RCP<const map_type> localRangeMap_;

  size_t NumNonzeros_;
  size_t MaxNumEntries_;
  size_t MaxNumEntriesA_;
  std::vector<size_t> NumEntries_;

  mutable nonconst_local_inds_host_view_type localIndices_;
  mutable nonconst_local_inds_host_view_type localIndicesForGlobalCopy_;
  mutable nonconst_values_host_view_type Values_;

};// class LocalFilter

}// namespace Ifpack2

#endif /* IFPACK2_LOCALFILTER_DECL_HPP */