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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkImageCacheFilter.h,v $

  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.

=========================================================================*/
// .NAME vtkImageCacheFilter - Caches multiple vtkImageData objects.

// .SECTION Description
// vtkImageCacheFilter keep a number of vtkImageDataObjects from previous
// updates to satisfy future updates without needing to update the input.  It
// does not change the data at all.  It just makes the pipeline more
// efficient at the expense of using extra memory.

#ifndef __vtkImageCacheFilter_h
#define __vtkImageCacheFilter_h

#include "vtkImageAlgorithm.h"

class vtkExecutive;

class VTK_IMAGING_EXPORT vtkImageCacheFilter : public vtkImageAlgorithm
{
public:
  static vtkImageCacheFilter *New();
  vtkTypeRevisionMacro(vtkImageCacheFilter,vtkImageAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // This is the maximum number of images that can be retained in memory.
  // it defaults to 10.
  void SetCacheSize(int size);
  int GetCacheSize();
  
protected:
  vtkImageCacheFilter();
  ~vtkImageCacheFilter();

  // Create a default executive.
  virtual vtkExecutive* CreateDefaultExecutive();
  virtual void ExecuteData(vtkDataObject *);
  
private:
  vtkImageCacheFilter(const vtkImageCacheFilter&);  // Not implemented.
  void operator=(const vtkImageCacheFilter&);  // Not implemented.
};



#endif