DiscreteDeltaFn.H

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// DiscreteDeltaFn.H

//
// 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.
//
// Dan Martin, Fri, Jan 14, 2000

#ifndef _DiscreteDeltaFn_H_
#define _DiscreteDeltaFn_H_

#include "REAL.H"
#include "RealVect.H"
#include "FArrayBox.H"


class DiscreteDeltaFn
{
public:
  DiscreteDeltaFn() {};
  
  DiscreteDeltaFn(Real a_epsilon) {};

  virtual ~DiscreteDeltaFn() {};

  virtual void define(Real a_epsilon) = 0;

  virtual Real epsilon() const = 0;

  virtual DiscreteDeltaFn* clone() const = 0;

  virtual Real evaluateDelta(Real a_radius) const = 0;

  virtual Real integralDelta(Real a_radius) const = 0;
  
  virtual Real computeK(RealVect& a_radius, int a_idir, int a_jdir) const = 0;


  virtual void sumForce(FArrayBox& a_sum, 
                        const RealVect& a_force,
                        const Box& a_box,
                        const RealVect& a_position,
                        const RealVect& a_origin,
                        Real a_dx) = 0;




  virtual void sumForce(FArrayBox& a_sum, 
                        const RealVect& a_force,
                        const Box& a_box,
                        int a_dir, 
                        int a_destComp,
                        const RealVect& a_position,
                        const RealVect& a_origin,
                        Real a_dx) = 0;

  
  virtual Real computeLapDelta(Real a_radius) const = 0;

};
   


#endif

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