EpetraExt_Overlap_CrsGraph.cpp

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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
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// This library is distributed in the hope that it will be useful, but
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// 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
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// Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
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#include <EpetraExt_Overlap_CrsGraph.h>

#include <Epetra_Import.h>
#include <Epetra_CrsGraph.h>
#include <Epetra_Map.h>

namespace EpetraExt {

CrsGraph_Overlap::
~CrsGraph_Overlap()
{
  if( newObj_ ) delete newObj_;

  if( OverlapMap_ ) delete OverlapMap_;
}

CrsGraph_Overlap::NewTypeRef
CrsGraph_Overlap::
operator()( OriginalTypeRef orig )
{
  origObj_ = &orig;

  //check that this is a distributed graph and overlap level is not zero
  if( orig.DomainMap().DistributedGlobal() && levelOverlap_ )
  {
    Epetra_CrsGraph * OverlapGraph = new Epetra_CrsGraph( orig );
    OverlapMap_ = new Epetra_BlockMap( orig.RowMap() );

    Epetra_BlockMap * DomainMap = &(const_cast<Epetra_BlockMap&>(orig.DomainMap()));
    Epetra_BlockMap * RangeMap = &(const_cast<Epetra_BlockMap&>(orig.RangeMap()));

    for( int level = 0; level < levelOverlap_; ++level )
    {
      Epetra_BlockMap * OldRowMap = OverlapMap_;
      Epetra_CrsGraph * OldGraph = OverlapGraph;

      Epetra_Import & OverlapImporter = *(const_cast<Epetra_Import *>( OldGraph->Importer() ));
      OverlapMap_ = new Epetra_BlockMap( OverlapImporter.TargetMap() );

      //filter to local square block on last level if required
      if( squareLocalBlock_ && level==(levelOverlap_-1) )
        OverlapGraph = new Epetra_CrsGraph( Copy, *OverlapMap_, *OverlapMap_, 0 );
      else
        OverlapGraph = new Epetra_CrsGraph( Copy, *OverlapMap_, 0 );

      OverlapGraph->Import( *OldGraph, OverlapImporter, Insert );
      OverlapGraph->FillComplete( *DomainMap, *RangeMap );

      delete OldGraph;
      delete OldRowMap;
    }

    newObj_ = OverlapGraph;
  }
  else //just create a copy since this is not a InPlaceTransform
    newObj_ = new Epetra_CrsGraph( orig );

  return *newObj_;
}

} // namespace EpetraExt

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