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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
* @class vtkCellMetadata
* @brief Metadata for a particular type of cell (finite element).
*
* This is a base class for metadata on cell types held by a vtkCellGrid
* instance (not for subclasses of vtkCell).
* A vtkCellGrid holds one instance of a vtkCellMetadata-subclass for
* each *type* of cell present in the grid.
*
* This class intentionally provides very little functionality; instead,
* it is intended to serve as a key or index into a set of registered
* responder classes which are able respond to queries about cells of
* this type. This pattern makes it possible to extend VTK with both
* new cell types and new types of queries for existing cell types.
*
* @sa vtkCellGrid
*/
#ifndef vtkCellMetadata_h
#define vtkCellMetadata_h
#include "vtkCellGridResponders.h" // For ivar.
#include "vtkCommonDataModelModule.h" // for export macro
#include "vtkNew.h" // for queries
#include "vtkObject.h"
#include "vtkSmartPointer.h" // for constructor return values
#include "vtkStringToken.h" // for vtkStringToken::Hash
#include "vtkTypeName.h" // for vtk::TypeName<>()
#include <functional>
#include <set>
#include <unordered_map>
VTK_ABI_NAMESPACE_BEGIN
class vtkCellGrid;
class vtkCellGridQuery;
class vtkDataSetAttributes;
class vtkCellAttribute;
class VTKCOMMONDATAMODEL_EXPORT vtkCellMetadata : public vtkObject
{
public:
using CellTypeId = vtkStringToken::Hash;
using DOFType = vtkStringToken;
using MetadataConstructor = std::function<vtkSmartPointer<vtkCellMetadata>(vtkCellGrid*)>;
using ConstructorMap = std::unordered_map<vtkStringToken, MetadataConstructor>;
vtkTypeMacro(vtkCellMetadata, vtkObject);
void PrintSelf(ostream& os, vtkIndent indent) override;
/**
* Register a subclass of vtkCellMetadata.
*/
template <typename Subclass>
static bool RegisterType()
{
vtkStringToken name = vtk::TypeName<Subclass>();
auto status = vtkCellMetadata::Constructors.insert(std::make_pair(name, [](vtkCellGrid* grid) {
auto result = vtkSmartPointer<Subclass>::New();
if (result)
{
result->SetCellGrid(grid);
}
return result;
}));
return status.second; // true if insertion occurred.
}
template <typename Subclass>
static vtkSmartPointer<Subclass> NewInstance(vtkCellGrid* grid = nullptr)
{
vtkStringToken name = vtk::TypeName<Subclass>();
auto metadata = vtkCellMetadata::NewInstance(name, grid);
vtkSmartPointer<Subclass> result(Subclass::SafeDownCast(metadata));
return result;
}
static vtkSmartPointer<vtkCellMetadata> NewInstance(
vtkStringToken className, vtkCellGrid* grid = nullptr);
/**
* Return a hash of the cell type.
*
* WARNING: If you change this method, you must also update
* vtkCellGrid::AddCellMetadata() and vtkCellGrid::GetCellsOfType().
*/
CellTypeId Hash() { return vtkStringToken(this->GetClassName()).GetId(); }
/**
* Set the vtkCellGrid holding DOF arrays required by this cell.
*
* If the given vtkCellGrid does not have the required degrees
* of freedom arrays (as provided by GetDOFTypes()), then this
* method will return false.
*
* If this method returns true, the \a parent grid will have
* incremented the reference count of \a this class instance.
*/
virtual bool SetCellGrid(vtkCellGrid* parent);
/// Return the parent vtkCellGrid that owns this instance (or nullptr).
vtkGetObjectMacro(CellGrid, vtkCellGrid);
/// Return the number of cells of this type in the parent cell-grid object.
/// Subclasses must override this method.
virtual vtkIdType GetNumberOfCells() { return 0; }
/**
* Respond to a query on cells of this type.
*
* This returns true on success and false on failure.
* If no responder has been registered for queries of this type,
* that is considered a failure.
*/
bool Query(vtkCellGridQuery* query);
/**
* Copy \a other into this instance (which must be of the same type).
*
* These methods exist so subclasses know when they are being copied;
* the base class has no data to copy, so both ShallowCopy and DeepCopy
* do nothing.
*/
virtual void ShallowCopy(vtkCellMetadata* vtkNotUsed(other)) {}
virtual void DeepCopy(vtkCellMetadata* vtkNotUsed(other)) {}
/// Return the set of registered responder types.
static vtkCellGridResponders* GetResponders() { return vtkCellMetadata::Responders; }
protected:
vtkCellMetadata() = default;
~vtkCellMetadata() override;
vtkCellGrid* CellGrid{ nullptr };
static ConstructorMap Constructors;
static vtkNew<vtkCellGridResponders> Responders;
private:
vtkCellMetadata(const vtkCellMetadata&) = delete;
void operator=(const vtkCellMetadata&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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