test_scalar_kernel_trial_integrand_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
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// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
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#ifndef fiber_test_scalar_kernel_trial_integrand_functor_hpp
#define fiber_test_scalar_kernel_trial_integrand_functor_hpp

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

#include <cassert>
#include "collection_of_3d_arrays.hpp"
#include "geometrical_data.hpp"
#include "conjugate.hpp"
#include "scalar_traits.hpp"

namespace Fiber
{

template <typename BasisFunctionType_, typename KernelType_,
          typename ResultType_>
class TestScalarKernelTrialIntegrandFunctor
{
public:
    typedef BasisFunctionType_ BasisFunctionType;
    typedef KernelType_ KernelType;
    typedef ResultType_ ResultType;
    typedef typename ScalarTraits<ResultType>::RealType CoordinateType;

    void addGeometricalDependencies(size_t& testGeomDeps, size_t& trialGeomDeps) const {
        // do nothing
    }

    template <template <typename T> class CollectionOf2dSlicesOfConstNdArrays>
    ResultType evaluate(
            const ConstGeometricalDataSlice<CoordinateType>& /* testGeomData */,
            const ConstGeometricalDataSlice<CoordinateType>& /* trialGeomData */,
            const CollectionOf1dSlicesOfConst3dArrays<BasisFunctionType>& testValues,
            const CollectionOf1dSlicesOfConst3dArrays<BasisFunctionType>& trialValues,
            const CollectionOf2dSlicesOfConstNdArrays<KernelType>& kernelValues) const {
        // Assert that there is at least one scalar-valued kernel
        assert(kernelValues.size() >= 1);
        assert(kernelValues[0].extent(0) == 1);
        assert(kernelValues[0].extent(1) == 1);

        // Assert that there is at least one test and trial transformation
        // and that their dimensions agree
        assert(testValues.size() >= 1);
        assert(trialValues.size() >= 1);
        const size_t transCount = testValues.size();
        assert(trialValues.size() == transCount);
        if (kernelValues.size() > 1)
            assert(kernelValues.size() == transCount);

        ResultType result = 0.;
        for (size_t transIndex = 0; transIndex < transCount; ++transIndex) {
            const size_t transDim = testValues[transIndex].extent(0);
            assert(trialValues[transIndex].extent(0) == transDim);
            BasisFunctionType dotProduct = 0.;
            for (size_t dim = 0; dim < transDim; ++dim)
                dotProduct += conjugate(testValues[transIndex](dim)) *
                        trialValues[transIndex](dim);
            if (transCount == 1)
                result += dotProduct * kernelValues[0](0, 0);
            else
                result += dotProduct * kernelValues[transIndex](0, 0);
        }
        return result;
    }
};

} // namespace Fiber

#endif