modified_helmholtz_3d_hypersingular_kernel_functor.hpp

// Copyright (C) 2011-2012 by the BEM++ Authors
//
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// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#ifndef fiber_modified_helmholtz_3d_hypersingular_kernel_functor_hpp
#define fiber_modified_helmholtz_3d_hypersingular_kernel_functor_hpp

#include "../common/common.hpp"

#include "geometrical_data.hpp"
#include "scalar_traits.hpp"

#include "modified_helmholtz_3d_single_layer_potential_kernel_functor.hpp"

namespace Fiber
{

template <typename ValueType_>
class ModifiedHelmholtz3dHypersingularKernelFunctor
{
public:
    typedef ValueType_ ValueType;
    typedef typename ScalarTraits<ValueType>::RealType CoordinateType;

    explicit ModifiedHelmholtz3dHypersingularKernelFunctor(
            ValueType waveNumber) :
        m_slpKernel(waveNumber)
    {}

    int kernelCount() const { return 2; }
    int kernelRowCount(int /* kernelIndex */) const { return 1; }
    int kernelColCount(int /* kernelIndex */) const { return 1; }

    void addGeometricalDependencies(size_t& testGeomDeps, size_t& trialGeomDeps) const {
        m_slpKernel.addGeometricalDependencies(testGeomDeps, trialGeomDeps);
    }

    ValueType waveNumber() const { return m_slpKernel.waveNumber(); }

    template <template <typename T> class CollectionOf2dSlicesOfNdArrays>
    void evaluate(
            const ConstGeometricalDataSlice<CoordinateType>& testGeomData,
            const ConstGeometricalDataSlice<CoordinateType>& trialGeomData,
            CollectionOf2dSlicesOfNdArrays<ValueType>& result) const {
        // This will put the value of the SLP kernel in result[0](0, 0)
        m_slpKernel.evaluate(testGeomData, trialGeomData, result);
        result[1](0, 0) = result[0](0, 0) *
            m_slpKernel.waveNumber() * m_slpKernel.waveNumber();
    }

    CoordinateType estimateRelativeScale(CoordinateType distance) const {
        return m_slpKernel.estimateRelativeScale(distance);
    }

private:
    ModifiedHelmholtz3dSingleLayerPotentialKernelFunctor<ValueType> m_slpKernel;
};

} // namespace Fiber

#endif