EpetraExt_TCrsGraph_MapColoringIndex.h

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#ifndef EpetraExt_TCRSGRAPH_MAPCOLORINGINDEX_H
#define EpetraExt_TCRSGRAPH_MAPCOLORINGINDEX_H

#include <EpetraExt_Transform.h>
#include <Epetra_GIDTypeVector.h>
#include <Epetra_MapColoring.h>

#include <vector>
#include <map>

class Epetra_CrsGraph;
class Epetra_IntVector;

namespace EpetraExt {


template<typename int_type>
class TCrsGraph_MapColoringIndex
: public StructuralTransform< Epetra_CrsGraph,std::vector<typename Epetra_GIDTypeVector<int_type>::impl> > {

  const Epetra_MapColoring & ColorMap_;

 protected:


  ~TCrsGraph_MapColoringIndex() {}


  TCrsGraph_MapColoringIndex( const Epetra_MapColoring & ColorMap )
  : ColorMap_( ColorMap )
  {}
public:
  typedef StructuralTransform< Epetra_CrsGraph,std::vector<typename Epetra_GIDTypeVector<int_type>::impl> > Base;

  typedef typename Base::NewTypeRef NewTypeRef;
  typedef typename Base::OriginalTypeRef OriginalTypeRef;
  NewTypeRef operator()( OriginalTypeRef orig );
};


template<typename int_type>
typename TCrsGraph_MapColoringIndex<int_type>::NewTypeRef
TCrsGraph_MapColoringIndex<int_type>::
operator()( OriginalTypeRef orig )
{
  if(!orig.RowMap(). template GlobalIndicesIsType<int_type>())
    throw "EpetraExt::TCrsGraph_MapColoringIndex::operator(): Global indices mismatch.";

  Base::origObj_ = &orig;

  const Epetra_BlockMap & RowMap = orig.RowMap();
  int nRows = RowMap.NumMyElements();

  int NumColors = ColorMap_.NumColors();
  int * ListOfColors = ColorMap_.ListOfColors();

  std::map<int,int> MapOfColors;
  for( int i = 0; i < NumColors; ++i ) MapOfColors[ ListOfColors[i] ] = i;

  //initial setup of stl vector of IntVectors for indexing
  std::vector<int_type> dummy( nRows, -1 );
  typename Base::NewTypePtr IndexVec = new typename Base::NewType( NumColors, typename Epetra_GIDTypeVector<int_type>::impl( Copy, RowMap, &dummy[0] ) );

  int MaxNumIndices = orig.MaxNumIndices();
  int NumIndices;
  std::vector<int_type> Indices( MaxNumIndices );

  for( int i = 0; i < nRows; ++i )
  {
    orig.ExtractGlobalRowCopy( (int_type) orig.GRID64(i), MaxNumIndices, NumIndices, &Indices[0] );

    for( int j = 0; j < NumIndices; ++j )
     (*IndexVec)[ MapOfColors[ColorMap_(Indices[j])] ][i] = Indices[j];
  }

  Base::newObj_ = IndexVec;

  return *IndexVec;
}

} //namespace EpetraExt

#endif // EpetraExt_TCRSGRAPH_MAPCOLORINGINDEX_H