Ifpack_LocalFilter.h

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//       Ifpack: Object-Oriented Algebraic Preconditioner Package
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#ifndef IFPACK_LOCALFILTER_H
#define IFPACK_LOCALFILTER_H

#include "Ifpack_ConfigDefs.h"
#ifdef HAVE_MPI
#include "Epetra_MpiComm.h"
#else
#include "Epetra_SerialComm.h"
#endif
#include "Epetra_RowMatrix.h"
#include "Teuchos_RefCountPtr.hpp"

class Epetra_Map;
class Epetra_MultiVector;
class Epetra_Vector;
class Epetra_Import;
class Epetra_BlockMap;


class Ifpack_LocalFilter : public virtual Epetra_RowMatrix {

public:
  Ifpack_LocalFilter(const Teuchos::RefCountPtr<const Epetra_RowMatrix>& Matrix);


  virtual ~Ifpack_LocalFilter() {};




  virtual int NumMyRowEntries(int MyRow, int & NumEntries) const
  {
    NumEntries = NumEntries_[MyRow];
    return(0);
  }

  virtual int MaxNumEntries() const
  {
    return(MaxNumEntries_);
  }


  virtual int ExtractMyRowCopy(int MyRow, int Length, int & NumEntries, double *Values, int * Indices) const;


  virtual int ExtractDiagonalCopy(Epetra_Vector & Diagonal) const;



  virtual int Multiply(bool TransA, const Epetra_MultiVector& X, Epetra_MultiVector& Y) const
  {
    if (TransA == true) {
      IFPACK_CHK_ERR(-1);
    }

    IFPACK_CHK_ERR(Apply(X,Y));
    return(0);
  }

  virtual int Solve(bool /* Upper */, bool /* Trans */, bool /* UnitDiagonal */, const Epetra_MultiVector& /* X */,
                    Epetra_MultiVector& /* Y */) const
  {
    IFPACK_RETURN(-1); // not implemented
  }

  virtual int Apply(const Epetra_MultiVector& X,
                    Epetra_MultiVector& Y) const;

  virtual int ApplyInverse(const Epetra_MultiVector& X,
                           Epetra_MultiVector& Y) const;
  virtual int InvRowSums(Epetra_Vector& /* x */) const
  {
    IFPACK_RETURN(-1); // not implemented
  }

  virtual int LeftScale(const Epetra_Vector& /* x */)
  {
    IFPACK_RETURN(-1); // not implemented
  }

  virtual int InvColSums(Epetra_Vector& /* x */) const
  {
    IFPACK_RETURN(-1); // not implemented
  }


  virtual int RightScale(const Epetra_Vector& /* x */)
  {
    IFPACK_RETURN(-1); // not implemented
  }



  virtual bool Filled() const
  {
    return true;
  }

  /* Returns the quantity \f$ \| A \|_\infty\f$ such that
     \f[\| A \|_\infty = \max_{1\lei\len} \sum_{i=1}^m |a_{ij}| \f].
     */
  virtual double NormInf() const
  {
    return(-1.0);
  }

  /* Returns the quantity \f$ \| A \|_1\f$ such that
     \f[\| A \|_1= \max_{1\lej\len} \sum_{j=1}^n |a_{ij}| \f].
     */
  virtual double NormOne() const
  {
    IFPACK_RETURN(-1.0);
  }

#ifndef EPETRA_NO_32BIT_GLOBAL_INDICES
  virtual int NumGlobalNonzeros() const
  {
    return(NumNonzeros_);
  }

  virtual int NumGlobalRows() const
  {
    return(NumRows_);
  }

  virtual int NumGlobalCols() const
  {
    return(NumRows_);
  }

  virtual int NumGlobalDiagonals() const
  {
    return(NumRows_);
  }
#endif

  virtual long long NumGlobalNonzeros64() const
  {
    return(NumNonzeros_);
  }

  virtual long long NumGlobalRows64() const
  {
    return(NumRows_);
  }

  virtual long long NumGlobalCols64() const
  {
    return(NumRows_);
  }

  virtual long long NumGlobalDiagonals64() const
  {
    return(NumRows_);
  }

  virtual int NumMyNonzeros() const
  {
    return(NumNonzeros_);
  }

  virtual int NumMyRows() const
  {
    return(NumRows_);
  }

  virtual int NumMyCols() const
  {
    return(NumRows_);
  }

  virtual int NumMyDiagonals() const
  {
    return(NumRows_);
  }

  virtual bool LowerTriangular() const
  {
    return(Matrix_->LowerTriangular());
  }

  virtual bool UpperTriangular() const
  {
    return(Matrix_->UpperTriangular());
  }

  virtual const Epetra_Map & RowMatrixRowMap() const
  {
    return(*Map_);
  }

  virtual const Epetra_Map & RowMatrixColMap() const
  {
    return(*Map_);
  }

  virtual const Epetra_Import * RowMatrixImporter() const
  {
    return(0);
  }

  // following functions are required to derive Epetra_RowMatrix objects.

  int SetOwnership(bool /* ownership */)
  {
    IFPACK_RETURN(-1);
  }

  int SetUseTranspose(bool UseTranspose_in)
  {
    UseTranspose_ = UseTranspose_in;
    return(0);
  }

  bool UseTranspose() const
  {
    return(UseTranspose_);
  }

  bool HasNormInf() const
  {
    return(false);
  }

  const Epetra_Comm & Comm() const
  {
    return(*SerialComm_);
  }

  const Epetra_Map & OperatorDomainMap() const
  {
    return(*Map_);
  }

  const Epetra_Map & OperatorRangeMap() const
  {
    return(*Map_);
  }

const Epetra_BlockMap& Map() const;

const char* Label() const{
  return(Label_);
};

private:

  Teuchos::RefCountPtr<const Epetra_RowMatrix> Matrix_;
#ifdef HAVE_MPI
  Teuchos::RefCountPtr<Epetra_MpiComm> SerialComm_;
#else
  Teuchos::RefCountPtr<Epetra_SerialComm> SerialComm_;
#endif
  Teuchos::RefCountPtr<Epetra_Map> Map_;
  int NumRows_;
  int NumNonzeros_;
  int MaxNumEntries_;
  int MaxNumEntriesA_;
  std::vector<int> NumEntries_;
  mutable std::vector<int> Indices_;
  mutable std::vector<double> Values_;
  bool UseTranspose_;
  char Label_[80];
  Teuchos::RefCountPtr<Epetra_Vector> Diagonal_;
  /* unused (comment out to avoid build warnings)
  double NormOne_;
  double NormInf_;
  */
};

#endif /* IFPACK_LOCALFILTER_H */