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/*=========================================================================
Program: Visualization Toolkit
Module: vtkTreeIterator.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm 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.
=========================================================================*/
/**
* @class vtkTreeIterator
* @brief Abstract class for iterator over a vtkTree.
*
*
* The base class for tree iterators vtkTreeBFSIterator and vtkTreeDFSIterator.
*
* 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.
*
* @sa
* vtkTreeBFSIterator vtkTreeDFSIterator
*/
#ifndef vtkTreeIterator_h
#define vtkTreeIterator_h
#include "vtkCommonDataModelModule.h" // For export macro
#include "vtkObject.h"
VTK_ABI_NAMESPACE_BEGIN
class vtkTree;
class VTKCOMMONDATAMODEL_EXPORT vtkTreeIterator : public vtkObject
{
public:
vtkTypeMacro(vtkTreeIterator, vtkObject);
void PrintSelf(ostream& os, vtkIndent indent) override;
///@{
/**
* Set/get the graph to iterate over.
*/
void SetTree(vtkTree* tree);
vtkGetObjectMacro(Tree, vtkTree);
///@}
///@{
/**
* The start vertex of the traversal.
* The tree iterator will only iterate over the subtree rooted at vertex.
* If not set (or set to a negative value), starts at the root of the tree.
*/
void SetStartVertex(vtkIdType vertex);
vtkGetMacro(StartVertex, vtkIdType);
///@}
/**
* The next vertex visited in the graph.
*/
vtkIdType Next();
/**
* Return true when all vertices have been visited.
*/
bool HasNext();
/**
* Reset the iterator to its start vertex.
*/
void Restart();
protected:
vtkTreeIterator();
~vtkTreeIterator() override;
virtual void Initialize() = 0;
virtual vtkIdType NextInternal() = 0;
vtkTree* Tree;
vtkIdType StartVertex;
vtkIdType NextId;
private:
vtkTreeIterator(const vtkTreeIterator&) = delete;
void operator=(const vtkTreeIterator&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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