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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkAdjacentVertexIterator.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.

=========================================================================*/
/*-------------------------------------------------------------------------
  Copyright 2008 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/
// .NAME vtkAdjacentVertexIterator - Iterates through adjacent vertices in a graph.
//
// .SECTION Description
// vtkAdjacentVertexIterator iterates through all vertices adjacent to a
// vertex, i.e. the vertices which may be reached by traversing an out edge
// of the source vertex. Use graph->GetAdjacentVertices(v, it) to initialize
// the iterator.
//
// .SECTION See Also
// 
// .SECTION Thanks
// 

#ifndef __vtkAdjacentVertexIterator_h
#define __vtkAdjacentVertexIterator_h

#include "vtkObject.h"

#include "vtkGraph.h" // For edge type definitions

class vtkGraphEdge;

class VTK_FILTERING_EXPORT vtkAdjacentVertexIterator : public vtkObject
{
public:
  static vtkAdjacentVertexIterator *New();
  vtkTypeMacro(vtkAdjacentVertexIterator, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Initialize the iterator with a graph and vertex.
  void Initialize(vtkGraph *g, vtkIdType v);

  // Description:
  // Get the graph and vertex associated with this iterator.
  vtkGetObjectMacro(Graph, vtkGraph);
  vtkGetMacro(Vertex, vtkIdType);
  
  // Description:
  // Returns the next edge in the graph.
  vtkIdType Next()
  {
    vtkOutEdgeType e = *this->Current;
    ++this->Current;
    return e.Target;
  }

  // Description:
  // Whether this iterator has more edges.
  bool HasNext()
  {
    return this->Current != this->End;
  }

protected:
  vtkAdjacentVertexIterator();
  ~vtkAdjacentVertexIterator();

  // Description:
  // Protected method for setting the graph used
  // by Initialize().
  virtual void SetGraph(vtkGraph *graph);  

  vtkGraph            *Graph;
  const vtkOutEdgeType *Current;
  const vtkOutEdgeType *End;
  vtkIdType             Vertex;

private:
  vtkAdjacentVertexIterator(const vtkAdjacentVertexIterator&);  // Not implemented.
  void operator=(const vtkAdjacentVertexIterator&);  // Not implemented.
};

#endif