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//     EpetraExt: Epetra Extended - Linear Algebra Services Package
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#ifndef EpetraExt_CRSMATRIX_TRANSPOSE_H
#define EpetraExt_CRSMATRIX_TRANSPOSE_H

#include <EpetraExt_Transform.h>

class Epetra_RowMatrix;
class Epetra_CrsMatrix;
class Epetra_Map;
class Epetra_Export;

namespace EpetraExt {

//! Transform to form the explicit transpose of a Epetra_RowMatrix
class RowMatrix_Transpose : public SameTypeTransform<Epetra_RowMatrix>
{

 public:

  //! Destructor
  ~RowMatrix_Transpose();

  //! Constructor
  /*!
    \param In
    TransposeRowMap - Map to be used for row mapping of transpose matrix
    \param In
    IgnoreNonLocalCols - Whether to ignore non-local columns for the transpose
   */
  RowMatrix_Transpose( Epetra_Map * TransposeRowMap = 0,
		       bool IgnoreNonLocalCols = false)
  : TransposeMatrix_(0),
    TransposeRowMap_(TransposeRowMap),
    IgnoreNonLocalCols_(IgnoreNonLocalCols),
    NumMyRows_(0),
    NumMyCols_(0),
    MaxNumEntries_(0),
    Indices_(0),
    Values_(0),
    OrigMatrixIsCrsMatrix_(false)
  {}

  //! Transpose Transform Operator
  NewTypeRef operator()( OriginalTypeRef orig );

  //! Foward Data Migration
  bool fwd();

  //! Reverse Data Migration
  bool rvs();

  //! Release the pointer to TransposeMatrix_ (so you can take the matrix out w/o worring about deallocation)
  void ReleaseTranspose() {TransposeMatrix_=0;}

  //! Local-only transpose operator.  Don't use this unless you're sure you know what you're doing.
  /*! This pointer is not kept by the RowMatrix_Transpose object */
  Epetra_CrsMatrix * CreateTransposeLocal( OriginalTypeRef orig );

 private:
  Epetra_CrsMatrix * TransposeMatrix_;

  Epetra_Map * TransposeRowMap_;

  bool MakeDataContiguous_;
  bool IgnoreNonLocalCols_;

  int NumMyRows_;
  int NumMyCols_;
  int MaxNumEntries_;
  int * Indices_;
  double * Values_;

  bool OrigMatrixIsCrsMatrix_;

};

} //namespace EpetraExt

#endif //EpetraExt_ROWMATRIX_TRANSPOSE_H
