vtkCollectionIterator.h

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

  Program:   Visualization Toolkit
  Module:    vtkCollectionIterator.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.

=========================================================================*/
#ifndef vtkCollectionIterator_h
#define vtkCollectionIterator_h

#include "vtkCommonCoreModule.h" // For export macro
#include "vtkObject.h"

class vtkCollection;
class vtkCollectionElement;

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


  virtual void SetCollection(vtkCollection*);
  vtkGetObjectMacro(Collection, vtkCollection);

  void InitTraversal() { this->GoToFirstItem(); }

  void GoToFirstItem();

  void GoToNextItem();

  int IsDoneWithTraversal();

  vtkObject* GetCurrentObject();

protected:
  vtkCollectionIterator();
  ~vtkCollectionIterator() override;

  // The collection over which we are iterating.
  vtkCollection* Collection;

  // The current iterator position.
  vtkCollectionElement* Element;

  vtkObject* GetObjectInternal();
private:
  vtkCollectionIterator(const vtkCollectionIterator&) = delete;
  void operator=(const vtkCollectionIterator&) = delete;
};

#endif