Ifpack_METISReordering.h

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

#include "Ifpack_ConfigDefs.h"
#include "Ifpack_Reordering.h"
#include "Epetra_RowMatrix.h"
#include "Teuchos_ParameterList.hpp"
#include "Teuchos_RefCountPtr.hpp"

class Epetra_Comm;
class Ifpack_Graph;
class Epetra_Map;
class Epetra_BlockMap;
class Epetra_Import;


class Ifpack_METISReordering : public Ifpack_Reordering {

public:

  Ifpack_METISReordering();

  virtual ~Ifpack_METISReordering() {};

  virtual int SetParameter(const std::string Name, const int Value)
  {
    if (Name == "partitioner: use symmetric graph")
      UseSymmetricGraph_ = (bool)Value;
    return(0);
  }

  virtual int SetParameter(const std::string /* Name */, const double /* Value */)
  {
    return(0);
  };

  virtual int SetParameters(Teuchos::ParameterList& List)
  {
    UseSymmetricGraph_ = List.get("partitioner: use symmetric graph",
                                  UseSymmetricGraph_);

    return(0);
  }

  virtual int Compute(const Ifpack_Graph& Graph);

  virtual int Compute(const Epetra_RowMatrix& Matrix);

  virtual bool IsComputed() const
  {
    return(IsComputed_);
  }

  virtual int Reorder(const int i) const;

  virtual int InvReorder(const int i) const;

  virtual int P(const Epetra_MultiVector& Xorig,
                Epetra_MultiVector& X) const;

  virtual int Pinv(const Epetra_MultiVector& Xorig,
                   Epetra_MultiVector& X) const;

  virtual std::ostream& Print(std::ostream& os) const;

private:
  bool UseSymmetricGraph_;
  int NumMyRows_;
  bool IsComputed_;
  std::vector<int> Reorder_;
  std::vector<int> InvReorder_;

}; // class Ifpack_METISReordering

#endif // IFPACK_METISREORDERING_H