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NodeCoarseAverage.H

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//
// This software is copyright (C) by the Lawrence Berkeley
// National Laboratory.  Permission is granted to reproduce
// this software for non-commercial purposes provided that
// this notice is left intact.
// 
// It is acknowledged that the U.S. Government has rights to
// this software under Contract DE-AC03-765F00098 between
// the U.S.  Department of Energy and the University of
// California.
//
// This software is provided as a professional and academic
// contribution for joint exchange. Thus it is experimental,
// is provided ``as is'', with no warranties of any kind
// whatsoever, no support, no promise of updates, or printed
// documentation. By using this software, you acknowledge
// that the Lawrence Berkeley National Laboratory and
// Regents of the University of California shall have no
// liability with respect to the infringement of other
// copyrights by any part of this software.

// petermc, Tue, Nov 28, 2000
#ifndef NODECOARSEAVERAGE_H
#define NODECOARSEAVERAGE_H


#include "REAL.H"
#include "BaseFab.H"
#include "NodeFArrayBox.H"
#include "LevelData.H"
#include "DisjointBoxLayout.H"


class NodeCoarseAverage
{
public:



  NodeCoarseAverage();


  NodeCoarseAverage(const DisjointBoxLayout& a_gridsFine,
                    const DisjointBoxLayout& a_gridsCoarse,
                    int                      a_numcomps,
                    int                      a_refRatio,
                    const ProblemDomain&     a_domainFine);

  NodeCoarseAverage(const DisjointBoxLayout& a_gridsFine,
                    const DisjointBoxLayout& a_gridsCoarse,
                    int                      a_numcomps,
                    int                      a_refRatio,
                    const Box&               a_domainFine);


  NodeCoarseAverage(const DisjointBoxLayout& a_gridsCoarse,
                    int                      a_numcomps,
                    int                      a_refRatio,
                    const ProblemDomain&     a_domainFine);
  
  NodeCoarseAverage(const DisjointBoxLayout& a_gridsCoarse,
                    int                      a_numcomps,
                    int                      a_refRatio,
                    const Box&               a_domainFine);


  ~NodeCoarseAverage();


  void define(const DisjointBoxLayout& a_gridsFine,
              const DisjointBoxLayout& a_gridsCoarse,
              int                      a_numcomps,
              int                      a_refRatio,
              const ProblemDomain&     a_domainFine);

  void define(const DisjointBoxLayout& a_gridsFine,
              const DisjointBoxLayout& a_gridsCoarse,
              int                      a_numcomps,
              int                      a_refRatio,
              const Box&               a_domainFine);


  void define(const DisjointBoxLayout& a_gridsCoarse,
              int                      a_numcomps,
              int                      a_refRatio,
              const ProblemDomain&     a_domainFine);

  void define(const DisjointBoxLayout& a_gridsCoarse,
              int                      a_numcomps,
              int                      a_refRatio,
              const Box&               a_domainFine);



  bool isDefined() const;
  



  //     this method would like to be const, but the work array is changed.
  //     this suggests that the work array should not be persistent.
  void averageToCoarse(LevelData<NodeFArrayBox>& a_coarse,
                       LevelData<NodeFArrayBox>& a_fine);

protected:

  bool is_defined;

  // the refinement ratio
  int m_refRatio;

  // the number of components
  int m_numcomps;

  ProblemDomain m_domainCoarse;

  FArrayBox m_weights;

  // are the fine grids merely refined versions of the coarse grids?
  bool m_sameGrids;

  DisjointBoxLayout m_coarsenedGrids;

  // work array for the coarsening of the fine data, of the same "shape"
  // as the fine data.
  LevelData<NodeFArrayBox> m_coarsenedFine;

  // interior boundary nodes of coarsened fine grids, 
  // distributed among coarse grids.
  LayoutData< Vector<IntVectSet> > m_IVSV;

  // interior boundary nodes of coarsened fine grids,
  // distributed among the same grids.
  LayoutData< Vector<IntVectSet> > m_IVSVsame;

};

#endif

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