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// @HEADER
// ************************************************************************
//
//           Galeri: Finite Element and Matrix Generation Package
//                 Copyright (2006) ETHZ/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.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions about Galeri? Contact Marzio Sala (marzio.sala _AT_ gmail.com)
//
// ************************************************************************
// @HEADER

#ifndef GALERI_ABSTRACTVARIATIONAL_H
#define GALERI_ABSTRACTVARIATIONAL_H

/*!
 * \file Galeri_AbstractVariational.h
 */
namespace Galeri {
namespace FiniteElements {

/*!
 * \class AbstractVariational
 *
 * \brief Pure virtual class that defines the variational form.
 *
AbstractVariational is a pure virtual class, that specifies a set
of abstract interfaces, required to integrate the variational form
and the right-hand side over an element, and to compute the norm
of compute solution, exact solution, and error over the element.
A concrete implementation of this class also defined how boundary
conditions are resolved.

The element on which the integration is performed is specified by 
providing the coordinates of the local vertices.
 *
 * \author Marzio Sala, SNL 9214.
 *
 * \date Last updated on Apr-05.
 */

class AbstractVariational
{
public:

  // @{ \name Constructors and destructors
  //! Destructor.
  virtual ~AbstractVariational () {}

  // @}
  // @{ \name Bilinear form and right-hand side
  
  //! Evaluates the bilinear form (without integral) at point (x,y,z).
  virtual double LHS(const double Phi, const double Psi,
                     const double PhiX, const double PsiX,
                     const double PhiY, const double PsiY,
                     const double PhiZ, const double PsiZ,
                     const double x, const double y, const double z) const = 0;

  //! Returns the value of the right-hand side (without integral) at point (x, y, z).
  virtual double RHS(const double Psi, const double PsiX,
                     const double PsiY, const double PsiZ, 
                     const double x, const double y, const double z) const = 0;

  // @}
  // @{ \name Boundary conditions
  
  //! Returns an integer identifying the boundary condition assigned to the specified patch.
  virtual int BC(const int PatchID) const = 0;

  //! Returns the value of the boundary condition at point (x, y, z).
  virtual double BC(const double x, const double y, const double z,
                    const int PatchID) const = 0;

  // @}
  // @{ \name Integrations and norms

  //! Integrates the bilinear form and the right-hand side over the element.
  virtual int IntegrateOverElement(const AbstractVariational& Variational,
				   const double* x, const double* y, const double* z,
                                   const double* data,
				   double* ElementMatrix, double* ElementRHS) const = 0;

  //! Computes the norm of the computed solution over the element.
  virtual int ElementNorm(const double* LocalSol, const double* x, 
                          const double* y, const double* z, double* Norm) const = 0;

  //! Computed the norm of the exact solution over the element.
  virtual int ElementNorm(int (*ExactSolution)(double, double, double, double *),
			  const double* x, const double* y, const double* z,
			  double* Norm) const = 0;

  //! Computed the norm of the computed and exact solution over the element.
  virtual int ElementNorm(const double* LocalSol,
			  int (*ExactSolution)(double, double, double, double *),
			  const double* x, const double* y, const double* z, double * Norm) const = 0;
  
  // @}
};

} // namespace FiniteElements
} // namespace Galeri
#endif