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

  Program:   Visualization Toolkit
  Module:    vtkViewNodeCollection.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   vtkViewNodeCollection
 * @brief   collection of view nodes
 *
 * vtk centric collection of vtkViewNodes
*/

#ifndef vtkViewNodeCollection_h
#define vtkViewNodeCollection_h

#include "vtkRenderingSceneGraphModule.h" // For export macro
#include "vtkCollection.h"

class vtkViewNode;

class VTKRENDERINGSCENEGRAPH_EXPORT vtkViewNodeCollection :
  public vtkCollection
{
public:
  static vtkViewNodeCollection* New();
  vtkTypeMacro(vtkViewNodeCollection, vtkCollection);
  void PrintSelf(ostream& os, vtkIndent indent);

  /**
   * Add a ViewNode to the list.
   */
  void AddItem(vtkViewNode *a);

  /**
   * Get the next ViewNode in the list. NULL is returned when the collection is
   * exhausted.
   */
  vtkViewNode *GetNextItem();

  /**
   * Reentrant safe way to get an object in a collection. Just pass the
   * same cookie back and forth.
   */
  vtkViewNode *GetNextViewNode(vtkCollectionSimpleIterator &cookie);

  /**
   * Return true only if we have viewnode for obj.
   */
  bool IsRenderablePresent(vtkObject *obj);

protected:
  vtkViewNodeCollection() {};
  ~vtkViewNodeCollection() {};

private:
  // hide the standard AddItem from the user and the compiler.
  void AddItem(vtkObject *o)
    { this->vtkCollection::AddItem(o); }

  vtkViewNodeCollection(const vtkViewNodeCollection&) VTK_DELETE_FUNCTION;
  void operator=(const vtkViewNodeCollection&) VTK_DELETE_FUNCTION;
};

#endif
