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

  Program:   Visualization Toolkit
  Module:    vtkAppendFilter.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 vtkExecutionTimer_h
#define vtkExecutionTimer_h

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

class vtkAlgorithm;
class vtkCallbackCommand;

class VTKFILTERSCORE_EXPORT vtkExecutionTimer : public vtkObject
{
public:
  vtkTypeMacro(vtkExecutionTimer, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  static vtkExecutionTimer* New();


  void SetFilter(vtkAlgorithm* filter);
  vtkGetObjectMacro(Filter, vtkAlgorithm);


  vtkGetMacro(ElapsedCPUTime, double);


  vtkGetMacro(ElapsedWallClockTime, double);

protected:
  vtkExecutionTimer();
  ~vtkExecutionTimer();

  // This is the observer that will catch StartEvent and hand off to
  // EventRelay
  vtkCallbackCommand* Callback;

  // This is the filter that will be timed
  vtkAlgorithm* Filter;

  // These are where we keep track of the timestamps for start/end
  double CPUStartTime;
  double CPUEndTime;

  double WallClockStartTime;
  double WallClockEndTime;

  double ElapsedCPUTime;
  double ElapsedWallClockTime;


  void StartTimer();
  void StopTimer();

  virtual void TimerFinished();

  static void EventRelay(vtkObject* caller, unsigned long eventId, void* clientData, void* callData);

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

};

#endif