TranslationOperator.h

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/*-------------------------------------------------------------------
Copyright 2011 Ravishankar Sundararaman

This file is part of JDFTx.

JDFTx 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 3 of the License, or
(at your option) any later version.

JDFTx 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 JDFTx.  If not, see <http://www.gnu.org/licenses/>.
-------------------------------------------------------------------*/

#ifndef JDFTX_FLUID_TRANSLATIONOPERATOR_H
#define JDFTX_FLUID_TRANSLATIONOPERATOR_H


#include <core/GridInfo.h>
#include <core/ScalarField.h>

class TranslationOperator
{
public:
        const GridInfo& gInfo;

        TranslationOperator(const GridInfo& gInfo);
        virtual ~TranslationOperator() {}

        virtual void taxpy(const vector3<>& t, double alpha, const ScalarField& x, ScalarField& y) const=0;
};

class TranslationOperatorSpline : public TranslationOperator
{
public:
        const enum SplineType
        {       Constant, 
                Linear 
        } splineType;

        TranslationOperatorSpline(const GridInfo& gInfo, SplineType splineType);
        void taxpy(const vector3<>& t, double alpha, const ScalarField& x, ScalarField& y) const;
};

class TranslationOperatorFourier : public TranslationOperator
{
public:
        TranslationOperatorFourier(const GridInfo& gInfo);
        void taxpy(const vector3<>& t, double alpha, const ScalarField& x, ScalarField& y) const;
};

#endif // JDFTX_FLUID_TRANSLATIONOPERATOR_H