Ifpack2_SingletonFilter_decl.hpp

// @HEADER
// *****************************************************************************
//       Ifpack2: Templated Object-Oriented Algebraic Preconditioner Package
//
// Copyright 2009 NTESS and the Ifpack2 contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef IFPACK2_SINGLETONFILTER_DECL_HPP
#define IFPACK2_SINGLETONFILTER_DECL_HPP

#include "Ifpack2_ConfigDefs.hpp"
#include "Tpetra_ConfigDefs.hpp"
#include "Ifpack2_Details_RowMatrix.hpp"
#include "Tpetra_MultiVector.hpp"
#include "Teuchos_RefCountPtr.hpp"
#include "Teuchos_ScalarTraits.hpp"
#include <type_traits>
#include <vector>


namespace Ifpack2 {

template<class MatrixType>
class SingletonFilter :
    virtual public Ifpack2::Details::RowMatrix<MatrixType> {
public:
  typedef typename MatrixType::scalar_type Scalar;
  typedef typename MatrixType::local_ordinal_type LocalOrdinal;
  typedef typename MatrixType::global_ordinal_type GlobalOrdinal;
  typedef typename MatrixType::node_type Node;
  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>::magnitudeType magnitudeType;
  typedef Tpetra::RowMatrix<Scalar, LocalOrdinal, GlobalOrdinal, Node> row_matrix_type;
  typedef typename row_matrix_type::mag_type mag_type;

  static_assert(std::is_same<MatrixType, row_matrix_type>::value, "Ifpack2::SingletonFilter: The template parameter MatrixType must be a Tpetra::RowMatrix specialization.  Please don't use Tpetra::CrsMatrix (a subclass of Tpetra::RowMatrix) here anymore.");



  explicit SingletonFilter(const Teuchos::RCP<const Tpetra::RowMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> >& Matrix);

  virtual ~SingletonFilter();




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


  virtual Teuchos::RCP<const Tpetra::Map<LocalOrdinal,GlobalOrdinal,Node> > getRowMap() const;

  virtual Teuchos::RCP<const Tpetra::Map<LocalOrdinal,GlobalOrdinal,Node> > getColMap() const;

  virtual Teuchos::RCP<const Tpetra::Map<LocalOrdinal,GlobalOrdinal,Node> > getDomainMap() const;

  virtual Teuchos::RCP<const Tpetra::Map<LocalOrdinal,GlobalOrdinal,Node> > getRangeMap() const;

  virtual Teuchos::RCP<const Tpetra::RowGraph<LocalOrdinal,GlobalOrdinal,Node> > 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 GlobalOrdinal getIndexBase() const;

  virtual global_size_t getGlobalNumEntries() const;

  virtual size_t getLocalNumEntries() const;


  virtual size_t getNumEntriesInGlobalRow(GlobalOrdinal globalRow) const;


  virtual size_t getNumEntriesInLocalRow(LocalOrdinal localRow) const;

  virtual LocalOrdinal getBlockSize () 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 (GlobalOrdinal GlobalRow,
                   nonconst_global_inds_host_view_type &Indices,
                   nonconst_values_host_view_type &Values,
                   size_t& NumEntries) const;


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


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


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


  virtual void getLocalDiagCopy(Tpetra::Vector<Scalar,LocalOrdinal,GlobalOrdinal,Node> &diag) const;




  virtual void leftScale(const Tpetra::Vector<Scalar, LocalOrdinal, GlobalOrdinal, Node>& x);

  virtual void rightScale(const Tpetra::Vector<Scalar, LocalOrdinal, GlobalOrdinal, Node>& x);


  virtual mag_type getFrobeniusNorm() const;


  virtual void apply(const Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node> &X,
                     Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node> &Y,
                     Teuchos::ETransp mode = Teuchos::NO_TRANS,
                     Scalar alpha = Teuchos::ScalarTraits<Scalar>::one(),
                     Scalar beta = Teuchos::ScalarTraits<Scalar>::zero()) const;

  virtual bool hasTransposeApply() const;

  virtual void SolveSingletons(const Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& RHS,
                      Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& LHS);

  template <class DomainScalar, class RangeScalar>
  void SolveSingletonsTempl(const Tpetra::MultiVector<DomainScalar,LocalOrdinal,GlobalOrdinal,Node>& RHS,
                            Tpetra::MultiVector<RangeScalar,LocalOrdinal,GlobalOrdinal,Node>& LHS);

  virtual void CreateReducedRHS(const Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& LHS,
                       const Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& RHS,
                       Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& ReducedRHS);

  template <class DomainScalar, class RangeScalar>
  void CreateReducedRHSTempl(const Tpetra::MultiVector<DomainScalar,LocalOrdinal,GlobalOrdinal,Node>& LHS,
                             const Tpetra::MultiVector<RangeScalar,LocalOrdinal,GlobalOrdinal,Node>& RHS,
                             Tpetra::MultiVector<RangeScalar,LocalOrdinal,GlobalOrdinal,Node>& ReducedRHS);

  virtual void UpdateLHS(const Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& ReducedLHS,
                Tpetra::MultiVector<Scalar,LocalOrdinal,GlobalOrdinal,Node>& LHS);

  template <class DomainScalar, class RangeScalar>
  void UpdateLHSTempl(const Tpetra::MultiVector<DomainScalar,LocalOrdinal,GlobalOrdinal,Node>& ReducedLHS,
                      Tpetra::MultiVector<RangeScalar,LocalOrdinal,GlobalOrdinal,Node>& LHS);


private:

  Teuchos::RCP<const Tpetra::RowMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> > A_;
  Teuchos::RCP<const Tpetra::Map<LocalOrdinal, GlobalOrdinal, Node> > ReducedMap_;
  Teuchos::RCP<Tpetra::Vector<Scalar,LocalOrdinal,GlobalOrdinal,Node> > Diagonal_;
  size_t NumSingletons_;
  std::vector<LocalOrdinal> SingletonIndex_;
  std::vector<LocalOrdinal> Reorder_;
  std::vector<LocalOrdinal> InvReorder_;
  size_t NumRows_;
  size_t NumNonzeros_;
  size_t MaxNumEntries_;
  size_t MaxNumEntriesA_;
  std::vector<size_t> NumEntries_;
  mutable nonconst_local_inds_host_view_type Indices_;
  mutable nonconst_values_host_view_type Values_;
};// class SingletonFilter

}// namespace Ifpack2

#endif /* IFPACK2_SINGLETONFILTER_DECL_HPP */