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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
* @class vtkConduitArrayUtilities
* @brief helper to convert Conduit arrays to VTK arrays.
* @ingroup Insitu
*
* vtkConduitArrayUtilities is intended to convert Conduit nodes satisfying the
* `mcarray` protocol to VTK arrays. It uses zero-copy, as much as possible.
* Currently implementation fails if zero-copy is not possible. In future, that
* may be changed to do a deep-copy (with appropriate warnings) if necessary.
*
* This is primarily designed for use by vtkConduitSource.
*/
#ifndef vtkConduitArrayUtilities_h
#define vtkConduitArrayUtilities_h
#include "vtkIOCatalystConduitModule.h" // for exports
#include "vtkObject.h"
#include "vtkSmartPointer.h" // for vtkSmartPointer
#include "conduit.h" // for conduit_node
#include <string> // for std::string
VTK_ABI_NAMESPACE_BEGIN
class vtkCellArray;
class vtkDataArray;
class VTKIOCATALYSTCONDUIT_EXPORT vtkConduitArrayUtilities : public vtkObject
{
public:
static vtkConduitArrayUtilities* New();
vtkTypeMacro(vtkConduitArrayUtilities, vtkObject);
void PrintSelf(ostream& os, vtkIndent indent) override;
///@{
/**
* Returns a vtkDataArray from a conduit node in the conduit mcarray protocol.
*/
static vtkSmartPointer<vtkDataArray> MCArrayToVTKArray(const conduit_node* mcarray);
static vtkSmartPointer<vtkDataArray> MCArrayToVTKArray(
const conduit_node* mcarray, const std::string& arrayname);
///@}
///@{
/**
* Returns a vtkDataArray from a conduit node in the conduit mcarray protocol
* that is a conduit ghost array named ascent_ghosts.
*/
static vtkSmartPointer<vtkDataArray> MCGhostArrayToVTKGhostArray(
const conduit_node* mcarray, bool is_cell_data);
///@}
/**
* Converts an mcarray to vtkCellArray.
*
* This may reinterpret unsigned array as signed arrays to avoid deep-copying
* of data to match data type expected by vtkCellArray API.
*/
static vtkSmartPointer<vtkCellArray> MCArrayToVTKCellArray(
vtkIdType cellSize, const conduit_node* mcarray);
/**
* If the number of components in the array does not match the target, a new
* array is created.
*/
static vtkSmartPointer<vtkDataArray> SetNumberOfComponents(
vtkDataArray* array, int num_components);
/**
* Read a O2MRelation element
*/
static vtkSmartPointer<vtkCellArray> O2MRelationToVTKCellArray(
const conduit_node* o2mrelation, const std::string& leafname);
protected:
vtkConduitArrayUtilities();
~vtkConduitArrayUtilities() override;
static vtkSmartPointer<vtkDataArray> MCArrayToVTKArrayImpl(
const conduit_node* mcarray, bool force_signed);
static vtkSmartPointer<vtkDataArray> MCArrayToVTKAOSArray(
const conduit_node* mcarray, bool force_signed);
static vtkSmartPointer<vtkDataArray> MCArrayToVTKSOAArray(
const conduit_node* mcarray, bool force_signed);
private:
vtkConduitArrayUtilities(const vtkConduitArrayUtilities&) = delete;
void operator=(const vtkConduitArrayUtilities&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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