---

Common/vtkSource.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkSource.h,v $
  Language:  C++

  Copyright (c) 1993-2002 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 __vtkSource_h
#define __vtkSource_h

#include "vtkProcessObject.h"

class vtkDataObject;
class vtkErrorCode;

class VTK_COMMON_EXPORT vtkSource : public vtkProcessObject
{
public:
  vtkTypeRevisionMacro(vtkSource,vtkProcessObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  virtual void Update();

  virtual void UpdateWholeExtent();

  virtual void UpdateInformation();

  virtual void PropagateUpdateExtent(vtkDataObject *output);

  virtual void TriggerAsynchronousUpdate();

  virtual void UpdateData(vtkDataObject *output);

  virtual void ComputeInputUpdateExtents( vtkDataObject *output );


  virtual void SetReleaseDataFlag(int);
  virtual int GetReleaseDataFlag();
  vtkBooleanMacro(ReleaseDataFlag,int);

  virtual void UnRegister(vtkObjectBase *o);
  
  virtual int InRegisterLoop(vtkObject *);


  vtkDataObject **GetOutputs();
  vtkGetMacro(NumberOfOutputs,int);

  void UnRegisterAllOutputs(void);

  int GetOutputIndex(vtkDataObject *out);
  

  vtkGetMacro( ErrorCode, unsigned long );

protected:
  vtkSource();
  ~vtkSource();


  virtual void ExecuteData(vtkDataObject *vtkNotUsed(output)) {
    this->Execute(); };

  virtual void Execute();

  // By default, UpdateInformation calls this method to copy information
  // unmodified from the input to the output.
  virtual void ExecuteInformation();

  // Called to allocate the input array.  Copies old inputs.
  void SetNumberOfOutputs(int num);

  // method used internally for getting an output.
  vtkDataObject *GetOutput(int idx);

  // protected methods for setting inputs.
  virtual void SetNthOutput(int num, vtkDataObject *output);
  virtual void AddOutput(vtkDataObject *output);
  virtual void RemoveOutput(vtkDataObject *output);
  
  vtkDataObject **Outputs;     // An Array of the outputs to the filter
  int NumberOfOutputs;
  int Updating;
  // Time when ExecuteInformation was last called.
  vtkTimeStamp InformationTime;


  vtkSetMacro( ErrorCode, unsigned long );
private:
  vtkSource(const vtkSource&);  // Not implemented.
  void operator=(const vtkSource&);  // Not implemented.

  unsigned long ErrorCode;
};

#endif

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