Intrepid2_TransformedVectorData.hpp

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#ifndef Intrepid2_TransformedVectorData_h
#define Intrepid2_TransformedVectorData_h
 
#include "Intrepid2_VectorData.hpp"
 
#include "Intrepid2_ScalarView.hpp"
 
namespace Intrepid2 {
  template<class Scalar, typename DeviceType>
  class TransformedVectorData
  {
  public:
    using Transform = Data<Scalar,DeviceType>;
    
    Data<Scalar,DeviceType> transform_; // (C,P,D,D) jacobian or jacobian inverse; can also be unset for identity transform
    
    VectorData<Scalar, DeviceType> vectorData_; // notionally (F,P,D) container
    
    TransformedVectorData(const Data<Scalar,DeviceType> &transform, const VectorData<Scalar,DeviceType> &vectorData)
    :
    transform_(transform), vectorData_(vectorData)
    {
      // sanity check: when transform is diagonal, we expect there to be no pointwise variation.
      INTREPID2_TEST_FOR_EXCEPTION_DEVICE_SAFE(transform_.isDiagonal() && (transform_.getVariationTypes()[1] != CONSTANT), std::invalid_argument, "When transform is diagonal, we assume in various places that there is no pointwise variation; the transform_ Data should have CONSTANT as its variation type in dimension 1.");
    }
    
    TransformedVectorData(const VectorData<Scalar, DeviceType> &vectorData)
    :
    vectorData_(vectorData)
    {}
    
    template<typename OtherDeviceType, class = typename std::enable_if<!std::is_same<DeviceType, OtherDeviceType>::value>::type>
    TransformedVectorData(const TransformedVectorData<Scalar,OtherDeviceType> &transformedVectorData)
    :
    transform_(transformedVectorData.transform()),
    vectorData_(transformedVectorData.vectorData())
    {}
    
    KOKKOS_INLINE_FUNCTION bool axisAligned() const
    {
      if (!transform_.isValid())
      {
        // null transform is understood as the identity
        return true;
      }
      else
      {
        return transform_.isDiagonal();
      }
    }
    
    KOKKOS_INLINE_FUNCTION int cellDataExtent() const
    {
      return transform_.getDataExtent(0);
    }
    
    KOKKOS_INLINE_FUNCTION DataVariationType cellVariationType() const
    {
      return transform_.getVariationTypes()[0];
    }
    
    KOKKOS_INLINE_FUNCTION int numCells() const
    {
      return transform_.extent_int(0);
    }
    
    KOKKOS_INLINE_FUNCTION int numFields() const
    {
      return vectorData_.numFields();
    }
    
    KOKKOS_INLINE_FUNCTION int numPoints() const
    {
      return vectorData_.numPoints();
    }
    
    KOKKOS_INLINE_FUNCTION int spaceDim() const
    {
      return vectorData_.spaceDim();
    }
    
    KOKKOS_INLINE_FUNCTION Scalar operator()(const int &cellOrdinal, const int &fieldOrdinal, const int &pointOrdinal, const int &dim) const
    {
      if (!transform_.isValid())
      {
        // null transform is understood as the identity
        return vectorData_(fieldOrdinal,pointOrdinal,dim);
      }
      else if (transform_.isDiagonal())
      {
        return transform_(cellOrdinal,pointOrdinal,dim,dim) * vectorData_(fieldOrdinal,pointOrdinal,dim);
      }
      else
      {
        Scalar value = 0.0;
        for (int d2=0; d2<transform_.extent_int(2); d2++)
        {
          value += transform_(cellOrdinal,pointOrdinal,dim,d2) * vectorData_(fieldOrdinal,pointOrdinal,d2);
        }
        return value;
      }
    }
    
    KOKKOS_INLINE_FUNCTION Scalar transformWeight(const int &cellOrdinal, const int &pointOrdinal, const int &dim1, const int &dim2) const
    {
      if (!transform_.isValid())
      {
        // null transform is understood as identity
        return (dim1 == dim2) ? 1.0 : 0.0;
      }
      else
      {
        return transform_(cellOrdinal,pointOrdinal,dim1,dim2);
      }
    }
    
    const Data<Scalar,DeviceType> & transform() const
    {
      return transform_;
    }
    
    const VectorData<Scalar,DeviceType> & vectorData() const
    {
      return vectorData_;
    }
    
    KOKKOS_INLINE_FUNCTION
    constexpr unsigned rank() const
    {
      return 4; // shape is (C,F,P,D)
    }
    
    KOKKOS_INLINE_FUNCTION
    int extent_int(const int &r) const
    {
      if      (r == 0) return numCells();
      else if (r == 1) return numFields();
      else if (r == 2) return numPoints();
      else if (r == 3) return spaceDim();
      else if (r  > 3) return 1;
      
      INTREPID2_TEST_FOR_EXCEPTION_DEVICE_SAFE(true, std::invalid_argument, "Unsupported rank");
      return -1; // unreachable return; here to avoid compiler warnings.
    }
  };
}
 
#endif /* Intrepid2_TransformedVectorData_h */