text: //============================================================================
  //  Copyright (c) Kitware, Inc.
  //  All rights reserved.
  //  See LICENSE.txt for details.
  //
  //  This software is distributed WITHOUT ANY WARRANTY; without even
  //  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  //  PURPOSE.  See the above copyright notice for more information.
  //============================================================================
  
  #ifndef vtk_m_filter_DotProduct_h
  #define vtk_m_filter_DotProduct_h
  
  #include <vtkm/filter/FilterField.h>
  #include <vtkm/worklet/DotProduct.h>
  
  namespace vtkm
  {
  namespace filter
  {
  
  class DotProduct : public vtkm::filter::FilterField<DotProduct>
  {
  public:
    //currently the DotProduct filter only works on vector data.
    using SupportedTypes = TypeListTagVecCommon;
  
    VTKM_CONT
    DotProduct();
  
    //@{
    /// Choose the primary field to operate on. In the cross product operation A x B, A is
    /// the primary field.
    VTKM_CONT
    void SetPrimaryField(
      const std::string& name,
      vtkm::cont::Field::Association association = vtkm::cont::Field::Association::ANY)
    {
      this->SetActiveField(name, association);
    }
  
    VTKM_CONT const std::string& GetPrimaryFieldName() const { return this->SecondaryFieldName; }
    VTKM_CONT vtkm::cont::Field::Association GetPrimaryFieldAssociation() const
    {
      return this->SecondaryFieldAssociation;
    }
    //@}
  
    //@{
    /// When set to true, uses a coordinate system as the primary field instead of the one selected
    /// by name. Use SetPrimaryCoordinateSystem to select which coordinate system.
    VTKM_CONT
    void SetUseCoordinateSystemAsPrimaryField(bool flag)
    {
      this->SetUseCoordinateSystemAsField(flag);
    }
    VTKM_CONT
    bool GetUseCoordinateSystemAsPrimaryField() const
    {
      return this->GetUseCoordinateSystemAsField();
    }
    //@}
  
    //@{
    /// Select the coordinate system index to use as the primary field. This only has an effect when
    /// UseCoordinateSystemAsPrimaryField is true.
    VTKM_CONT
    void SetPrimaryCoordinateSystem(vtkm::Id index) { this->SetActiveCoordinateSystem(index); }
    VTKM_CONT
    vtkm::Id GetPrimaryCoordinateSystemIndex() const
    {
      return this->GetActiveCoordinateSystemIndex();
    }
    //@}
  
    //@{
    /// Choose the secondary field to operate on. In the cross product operation A x B, B is
    /// the secondary field.
    VTKM_CONT
    void SetSecondaryField(
      const std::string& name,
      vtkm::cont::Field::Association association = vtkm::cont::Field::Association::ANY)
    {
      this->SecondaryFieldName = name;
      this->SecondaryFieldAssociation = association;
    }
  
    VTKM_CONT const std::string& GetSecondaryFieldName() const { return this->GetActiveFieldName(); }
    VTKM_CONT vtkm::cont::Field::Association GetSecondaryFieldAssociation() const
    {
      return this->GetActiveFieldAssociation();
    }
    //@}
  
    //@{
    /// When set to true, uses a coordinate system as the primary field instead of the one selected
    /// by name. Use SetPrimaryCoordinateSystem to select which coordinate system.
    VTKM_CONT
    void SetUseCoordinateSystemAsSecondaryField(bool flag)
    {
      this->UseCoordinateSystemAsSecondaryField = flag;
    }
    VTKM_CONT
    bool GetUseCoordinateSystemAsSecondaryField() const
    {
      return this->UseCoordinateSystemAsSecondaryField;
    }
    //@}
  
    //@{
    /// Select the coordinate system index to use as the primary field. This only has an effect when
    /// UseCoordinateSystemAsPrimaryField is true.
    VTKM_CONT
    void SetSecondaryCoordinateSystem(vtkm::Id index)
    {
      this->SecondaryCoordinateSystemIndex = index;
    }
    VTKM_CONT
    vtkm::Id GetSecondaryCoordinateSystemIndex() const
    {
      return this->SecondaryCoordinateSystemIndex;
    }
    //@}
  
    template <typename T, typename StorageType, typename DerivedPolicy>
    VTKM_CONT vtkm::cont::DataSet DoExecute(
      const vtkm::cont::DataSet& input,
      const vtkm::cont::ArrayHandle<vtkm::Vec<T, 3>, StorageType>& field,
      const vtkm::filter::FieldMetadata& fieldMeta,
      vtkm::filter::PolicyBase<DerivedPolicy> policy);
  
  private:
    std::string SecondaryFieldName;
    vtkm::cont::Field::Association SecondaryFieldAssociation;
    bool UseCoordinateSystemAsSecondaryField;
    vtkm::Id SecondaryCoordinateSystemIndex;
  };
  }
  } // namespace vtkm::filter
  
  #include <vtkm/filter/DotProduct.hxx>
  
  #endif // vtk_m_filter_DotProduct_h
  