Ifpack_SubdomainFilter.h

//@HEADER
// ************************************************************************
// 
//              Ifpack_SubdomainFilter
//              Author: Radu Popescu <radu.popescu@epfl.ch>
//              Copyright 2011 EPFL - CMCS
// 
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#ifndef IFPACK_SUBDOMAINFILTER_H
#define IFPACK_SUBDOMAINFILTER_H

#ifdef IFPACK_SUBCOMM_CODE

#include "Ifpack_ConfigDefs.h"
#ifdef HAVE_MPI
#include "Epetra_MpiComm.h"
#else
#include "Epetra_SerialComm.h"
#endif
#include "Epetra_RowMatrix.h"
#include "Epetra_CrsMatrix.h"
#include "Epetra_IntVector.h"
#include "Teuchos_RCP.hpp"
#include "Ifpack_OverlappingRowMatrix.h"

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


class Ifpack_SubdomainFilter : public virtual Epetra_RowMatrix {

public:

  Ifpack_SubdomainFilter(const Teuchos::RCP<const Epetra_RowMatrix>& Matrix, int subdomainId);



  ~Ifpack_SubdomainFilter();



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

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


  virtual inline 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);
  }

  virtual int NumGlobalNonzeros() const
  {
    return(NumGlobalNonzeros_);
  }

  virtual int NumGlobalRows() const
  {;

    return(NumGlobalRows_);
  }

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

  virtual int NumGlobalDiagonals() const
  {
    return(NumGlobalRows_);
  }

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

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

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

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

  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(*colMap_);
  }

  virtual const Epetra_Import * RowMatrixImporter() const
  {
    return(&*Importer_);
  }

  virtual const Epetra_Import* Importer() const {return(&*Importer_);}

  virtual const Epetra_Export* Exporter() const {return(&*Exporter_);}

  // 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(*SubComm_);
  }

  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:
  void UpdateImportVector(int NumVectors) const;
  void UpdateExportVector(int NumVectors) const;

  Teuchos::RCP<const Epetra_RowMatrix> Matrix_;
  const Ifpack_OverlappingRowMatrix* ovA_;
#ifdef HAVE_MPI

  Teuchos::RCP<Epetra_MpiComm> SubComm_;
  MPI_Comm subdomainMPIComm_;
#else

  Teuchos::RCP<Epetra_SerialComm> SubComm_;
#endif

  Teuchos::RCP<Epetra_Map> Map_;
  Teuchos::RCP<Epetra_Map> colMap_;
  int NumMyRows_;
  int NumMyCols_;
  int NumMyNonzeros_;
  int NumGlobalRows_;
  int NumGlobalCols_;
  int NumGlobalNonzeros_;
  int MaxNumEntries_;
  int MaxNumEntriesA_;
  std::vector<int> NumEntries_;
  mutable std::vector<int> Indices_;
  mutable std::vector<double> Values_;
  bool UseTranspose_;
  char Label_[80];
  Teuchos::RCP<Epetra_Vector> Diagonal_;
  double NormOne_;
  double NormInf_;

  int* Ac_LIDMap_;
  int* Bc_LIDMap_;
  int* Ar_LIDMap_;
  int* Br_LIDMap_;

  const Epetra_CrsMatrix* Acrs_;

  int NumMyRowsA_;
  int NumMyColsA_;
  int NumMyRowsB_;

  //mutable Teuchos::RCP<Epetra_MultiVector> ImportVector_;
  //mutable Teuchos::RCP<Epetra_MultiVector> ExportVector_;
  mutable Epetra_MultiVector* ExportVector_;
  mutable Epetra_MultiVector* ImportVector_;
  Teuchos::RCP<Epetra_Import> Importer_;
  Teuchos::RCP<Epetra_Export> Exporter_;

};
#endif //ifdef IFPACK_SUBCOMM_CODE
#endif /* IFPACK_SUBDOMAINFILTER_H */