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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 vtkInEdgeIterator
* @brief Iterates through all incoming edges to a vertex.
*
*
* vtkInEdgeIterator iterates through all edges whose target is a particular
* vertex. Instantiate this class directly and call Initialize() to traverse
* the vertex of a graph. Alternately, use GetInEdges() on the graph to
* initialize the iterator. it->Next() returns a vtkInEdgeType structure,
* which contains Id, the edge's id, and Source, the edge's source vertex.
*
* @sa
* vtkGraph vtkOutEdgeIterator
*/
#ifndef vtkInEdgeIterator_h
#define vtkInEdgeIterator_h
#include "vtkCommonDataModelModule.h" // For export macro
#include "vtkObject.h"
#include "vtkGraph.h" // For edge type definitions
VTK_ABI_NAMESPACE_BEGIN
class vtkGraphEdge;
class VTKCOMMONDATAMODEL_EXPORT vtkInEdgeIterator : public vtkObject
{
public:
static vtkInEdgeIterator* New();
vtkTypeMacro(vtkInEdgeIterator, vtkObject);
void PrintSelf(ostream& os, vtkIndent indent) override;
/**
* Initialize the iterator with a graph and vertex.
*/
void Initialize(vtkGraph* g, vtkIdType v);
///@{
/**
* Get the graph and vertex associated with this iterator.
*/
vtkGetObjectMacro(Graph, vtkGraph);
vtkGetMacro(Vertex, vtkIdType);
///@}
///@{
/**
* Returns the next edge in the graph.
*/
vtkInEdgeType Next()
{
vtkInEdgeType e = *this->Current;
++this->Current;
return e;
}
///@}
/**
* Just like Next(), but
* returns heavy-weight vtkGraphEdge object instead of
* the vtkEdgeType struct, for use with wrappers.
* The graph edge is owned by this iterator, and changes
* after each call to NextGraphEdge().
*/
vtkGraphEdge* NextGraphEdge();
/**
* Whether this iterator has more edges.
*/
bool HasNext() { return this->Current != this->End; }
protected:
vtkInEdgeIterator();
~vtkInEdgeIterator() override;
/**
* Protected method for setting the graph used
* by Initialize().
*/
virtual void SetGraph(vtkGraph* graph);
vtkGraph* Graph;
const vtkInEdgeType* Current;
const vtkInEdgeType* End;
vtkIdType Vertex;
vtkGraphEdge* GraphEdge;
private:
vtkInEdgeIterator(const vtkInEdgeIterator&) = delete;
void operator=(const vtkInEdgeIterator&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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