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// ***********************************************************************
//
// 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
// USA
// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
//
// ***********************************************************************
//@HEADER
//
#ifndef EpetraExt_AMESOS_BTF_CRSGRAPH_H
#define EpetraExt_AMESOS_BTF_CRSGRAPH_H
#include <EpetraExt_Transform.h>
#include <Teuchos_RCP.hpp>
#include <vector>
class Epetra_CrsGraph;
class Epetra_Map;
namespace EpetraExt {
///
/** Block Triangular Factorization (Reordering) of Epetra_CrsGraph
*
* Uses Tim Davis' BTF algorithm to find a block lower or upper triangular
* ordering form a Epetra_CrsGraph.
*/
class AmesosBTF_CrsGraph : public StructuralSameTypeTransform<Epetra_CrsGraph> {
public:
///
/** Destructor
*/
~AmesosBTF_CrsGraph();
///
/** Default Constructor
*/
AmesosBTF_CrsGraph( bool upperTri = false, bool verbose = false )
: numBlocks_(0),
upperTri_(upperTri),
verbose_(verbose)
{}
///
/** Construction of BTF ordered Epetra_CrsGraph from <tt>orig</tt> object.
*
* Preconditions:<ul>
* </ul>
*
* Invariants:<ul>
* </ul>
*
* Postconditions:<ul>
* </ul>
*
*/
NewTypeRef operator()( OriginalTypeRef orig );
std::vector<int> RowPerm() { return rowPerm_; }
std::vector<int> ColPerm() { return colPerm_; }
std::vector<int> BlockPtr() { return blkPtr_; }
int NumBlocks() { return numBlocks_; }
private:
Teuchos::RCP<Epetra_Map> NewRowMap_;
Teuchos::RCP<Epetra_Map> NewColMap_;
Teuchos::RCP<Epetra_CrsGraph> NewGraph_;
std::vector<int> rowPerm_, colPerm_, blkPtr_;
int numBlocks_;
const bool upperTri_, verbose_;
};
} //namespace EpetraExt
#endif //EpetraExt_AMESOS_BTF_CRSGRAPH_H
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