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// ***********************************************************************
//
// Tifpack: Tempated Object-Oriented Algebraic Preconditioner Package
// Copyright (2009) 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 TIFPACK_CREATEOVERLAPGRAPH_HPP
#define TIFPACK_CREATEOVERLAPGRAPH_HPP
#include "Tifpack_ConfigDefs.hpp"
#include "Tpetra_CrsGraph.hpp"
#include "Tpetra_Import.hpp"
#include "Teuchos_RefCountPtr.hpp"
namespace Tifpack {
//! Constructs an overlapped graph for use with Tifpack preconditioners.
/**
If OverlapLevel is 0, then the overlapped graph is the input_graph.
*/
template<class LocalOrdinal, class GlobalOrdinal, class Node>
Teuchos::RCP<const Tpetra::CrsGraph<LocalOrdinal,GlobalOrdinal,Node> > CreateOverlapGraph(const Teuchos::RCP<const Tpetra::CrsGraph<LocalOrdinal,GlobalOrdinal,Node> >& input_graph, int OverlapLevel)
{
typedef Tpetra::CrsGraph<LocalOrdinal,GlobalOrdinal,Node> GraphType;
typedef Tpetra::Map<LocalOrdinal,GlobalOrdinal,Node> MapType;
typedef Tpetra::Import<LocalOrdinal,GlobalOrdinal,Node> ImportType;
TEST_FOR_EXCEPTION(OverlapLevel < 0, std::runtime_error, "Tifpack::CreateOverlapGraph: OverlapLevel must be >= 0.");
Teuchos::RCP<GraphType> OverlapGraph;
const int numProcs = input_graph->getMap()->getComm()->getSize();
if (OverlapLevel == 0 || numProcs < 2) return input_graph;
Teuchos::RCP<const MapType> OverlapRowMap = input_graph->getRowMap();
Teuchos::RCP<const GraphType> OldGraph;
Teuchos::RCP<const MapType> OldRowMap;
const Teuchos::RCP<const MapType> DomainMap = input_graph->getDomainMap();
const Teuchos::RCP<const MapType> RangeMap = input_graph->getRangeMap();
for (int level=1; level <= OverlapLevel; level++) {
OldGraph = OverlapGraph;
OldRowMap = OverlapRowMap;
Teuchos::RCP<const ImportType> OverlapImporter = OldGraph->getImporter();
OverlapRowMap = OverlapImporter->getTargetMap();
if (level<OverlapLevel) {
OverlapGraph = Teuchos::rcp( new GraphType(OverlapRowMap, 0) );
}
else {
// On last iteration, we want to filter out all columns except those that
// correspond to rows in the graph. This assures that our matrix is square
OverlapGraph = Teuchos::rcp( new GraphType(OverlapRowMap, OverlapRowMap, 0) );
}
OverlapGraph->doImport(*input_graph, *OverlapImporter, Tpetra::INSERT);
OverlapGraph->fillComplete(DomainMap, RangeMap);
}
return OverlapGraph;
}
}//namespace Tifpack
#endif // TIFPACK_CREATEOVERLAPGRAPH_HPP
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