/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2009 OpenCFD Ltd.
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
    Free Software Foundation; either version 2 of the License, or (at your
    option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM; if not, write to the Free Software Foundation,
    Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Class
    Foam::localMin

Description
    LocalMin-mean differencing scheme class.

    This scheme interpolates 1/field using a scheme specified at run-time
    and return the reciprocal of the interpolate.

SourceFiles
    localMin.C

\*---------------------------------------------------------------------------*/

#ifndef localMin_H
#define localMin_H

#include "surfaceInterpolationScheme.H"
#include "volFields.H"
#include "surfaceFields.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

/*---------------------------------------------------------------------------*\
                           Class localMin Declaration
\*---------------------------------------------------------------------------*/

template<class Type>
class localMin
:
    public surfaceInterpolationScheme<Type>
{
    // Private Member Functions

        //- Disallow default bitwise assignment
        void operator=(const localMin&);


public:

    //- Runtime type information
    TypeName("localMin");


    // Constructors

        //- Construct from mesh
        localMin(const fvMesh& mesh)
        :
            surfaceInterpolationScheme<Type>(mesh)
        {}

        //- Construct from Istream. 
        //  The name of the flux field is read from the Istream and looked-up
        //  from the mesh objectRegistry
        localMin
        (
            const fvMesh& mesh,
            Istream& is
        )
        :
            surfaceInterpolationScheme<Type>(mesh)
        {}

        //- Construct from faceFlux and Istream
        localMin
        (
            const fvMesh& mesh,
            const surfaceScalarField& faceFlux,
            Istream& is
        )
        :
            surfaceInterpolationScheme<Type>(mesh)
        {}


    // Member Functions

        //- Return the interpolation weighting factors
        virtual tmp<surfaceScalarField> weights
        (
            const GeometricField<Type, fvPatchField, volMesh>&
        ) const
        {
            notImplemented
            (
                "localMin::weights"
                "(const GeometricField<Type, fvPatchField, volMesh>&)"
            );

            return tmp<surfaceScalarField>(NULL);
        }

        //- Return the face-interpolate of the given cell field
        virtual tmp<GeometricField<Type, fvsPatchField, surfaceMesh> >
        interpolate
        (
            const GeometricField<Type, fvPatchField, volMesh>& vf
        ) const
        {
            const fvMesh& mesh = vf.mesh();

            tmp<GeometricField<Type, fvsPatchField, surfaceMesh> > tvff
            (
                new GeometricField<Type, fvsPatchField, surfaceMesh>
                (
                    IOobject
                    (
                        "localMin::interpolate(" + vf.name() + ')',
                        mesh.time().timeName(),
                        mesh
                    ),
                    mesh,
                    vf.dimensions()
                )
            );
            GeometricField<Type, fvsPatchField, surfaceMesh>& vff = tvff();

            forAll(vff.boundaryField(), patchi)
            {
                vff.boundaryField()[patchi] = vf.boundaryField()[patchi];
            }

            const unallocLabelList& own = mesh.owner();
            const unallocLabelList& nei = mesh.neighbour();

            forAll(vff, facei)
            {
                vff[facei] = minMod(vf[own[facei]], vf[nei[facei]]);
            }

            return tvff;
        }
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //