//@HEADER
// ***********************************************************************
// 
//     EpetraExt: Epetra Extended - Linear Algebra Services Package
//                 Copyright (2001) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
// 
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//  
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//  
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
// 
// ***********************************************************************
//@HEADER
                                                                                                    
#ifndef EpetraExt_CRSMATRIX_REINDEX_H
#define EpetraExt_CRSMATRIX_REINDEX_H

#include <EpetraExt_Transform.h>

class Epetra_CrsMatrix;
class Epetra_Map;

namespace EpetraExt {

///
/** Given an Epetra_CrsMatrix, a "reindexed" version is returned based on
 *  the new row map.  The row map must be conformal to the original.  The
 *  Matrix data will be shared by the new Matrix using the new indexing
 */
class CrsMatrix_Reindex : public ViewTransform<Epetra_CrsMatrix> {

  const Epetra_Map & NewRowMap_;
  Epetra_Map * NewColMap_;

 public:

  ///
  /** Destructor
   */
  ~CrsMatrix_Reindex();

  ///
  /** Constructor
   */
  CrsMatrix_Reindex( const Epetra_Map & new_row_map )
  : NewRowMap_(new_row_map),
    NewColMap_(0)
  {}

  ///
  /** Constructs "reindexed" Matrix
   */
  NewTypeRef operator()( OriginalTypeRef orig );

};

} //namespace EpetraExt

#endif //EpetraExt_CRSMATRIX_REINDEX_H