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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-FileCopyrightText: Copyright 2008 Sandia Corporation
// SPDX-License-Identifier: LicenseRef-BSD-3-Clause-Sandia-USGov
/**
* @class vtkTreeDFSIterator
* @brief depth first iterator through a vtkGraph
*
*
* vtkTreeDFSIterator performs a depth first search traversal of a tree.
*
* First, you must set the tree on which you are going to iterate, and then
* optionally set the starting vertex and mode. The mode is either
* DISCOVER (default), in which case vertices are visited as they are first
* reached, or FINISH, in which case vertices are visited when they are
* done, i.e. all adjacent vertices have been discovered already.
*
* After setting up the iterator, the normal mode of operation is to
* set up a <code>while(iter->HasNext())</code> loop, with the statement
* <code>vtkIdType vertex = iter->Next()</code> inside the loop.
*/
#ifndef vtkTreeDFSIterator_h
#define vtkTreeDFSIterator_h
#include "vtkCommonDataModelModule.h" // For export macro
#include "vtkTreeIterator.h"
VTK_ABI_NAMESPACE_BEGIN
class vtkTreeDFSIteratorInternals;
class vtkIntArray;
class VTKCOMMONDATAMODEL_EXPORT vtkTreeDFSIterator : public vtkTreeIterator
{
public:
static vtkTreeDFSIterator* New();
vtkTypeMacro(vtkTreeDFSIterator, vtkTreeIterator);
void PrintSelf(ostream& os, vtkIndent indent) override;
enum ModeType
{
DISCOVER,
FINISH
};
///@{
/**
* Set the visit mode of the iterator. Mode can be
* DISCOVER (0): Order by discovery time
* FINISH (1): Order by finish time
* Default is DISCOVER.
* Use DISCOVER for top-down algorithms where parents need to be processed before children.
* Use FINISH for bottom-up algorithms where children need to be processed before parents.
*/
void SetMode(int mode);
vtkGetMacro(Mode, int);
///@}
protected:
vtkTreeDFSIterator();
~vtkTreeDFSIterator() override;
void Initialize() override;
vtkIdType NextInternal() override;
int Mode;
vtkIdType CurRoot;
vtkTreeDFSIteratorInternals* Internals;
vtkIntArray* Color;
enum ColorType
{
WHITE,
GRAY,
BLACK
};
private:
vtkTreeDFSIterator(const vtkTreeDFSIterator&) = delete;
void operator=(const vtkTreeDFSIterator&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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