dox/Filtering/vtkAlgorithm.h

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

  Program:   Visualization Toolkit
  Module:    vtkAlgorithm.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 __vtkAlgorithm_h
#define __vtkAlgorithm_h

#include "vtkObject.h"

class vtkAbstractArray;
class vtkAlgorithmInternals;
class vtkAlgorithmOutput;
class vtkDataArray;
class vtkDataObject;
class vtkExecutive;
class vtkInformation;
class vtkInformationInformationVectorKey;
class vtkInformationIntegerKey;
class vtkInformationStringKey;
class vtkInformationStringVectorKey;
class vtkInformationVector;

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

  int HasExecutive();

  vtkExecutive* GetExecutive();

  virtual void SetExecutive(vtkExecutive* executive);


  virtual int ProcessRequest(vtkInformation* request,
                             vtkInformationVector** inInfo,
                             vtkInformationVector* outInfo);


  virtual int
  ComputePipelineMTime(vtkInformation* request,
                       vtkInformationVector** inInfoVec,
                       vtkInformationVector* outInfoVec,
                       int requestFromOutputPort,
                       unsigned long* mtime);

  virtual int ModifyRequest(vtkInformation* request, int when);

  vtkInformation* GetInputPortInformation(int port);

  vtkInformation* GetOutputPortInformation(int port);


  vtkGetObjectMacro(Information, vtkInformation);
  virtual void SetInformation(vtkInformation*);

  int GetNumberOfInputPorts();

  int GetNumberOfOutputPorts();


  virtual void Register(vtkObjectBase* o);
  virtual void UnRegister(vtkObjectBase* o);


  vtkSetMacro(AbortExecute,int);
  vtkGetMacro(AbortExecute,int);
  vtkBooleanMacro(AbortExecute,int);


  vtkSetClampMacro(Progress,double,0.0,1.0);
  vtkGetMacro(Progress,double);

  void UpdateProgress(double amount);


  void SetProgressText(const char* ptext);
  vtkGetStringMacro(ProgressText);


  vtkGetMacro( ErrorCode, unsigned long );

  // left public for performance since it is used in inner loops
  int AbortExecute;


  static vtkInformationIntegerKey* INPUT_IS_OPTIONAL();
  static vtkInformationIntegerKey* INPUT_IS_REPEATABLE();
  static vtkInformationInformationVectorKey* INPUT_REQUIRED_FIELDS();
  static vtkInformationStringVectorKey* INPUT_REQUIRED_DATA_TYPE();
  static vtkInformationInformationVectorKey* INPUT_ARRAYS_TO_PROCESS();
  static vtkInformationIntegerKey* INPUT_PORT();
  static vtkInformationIntegerKey* INPUT_CONNECTION();

  

  virtual void SetInputArrayToProcess(int idx, int port, int connection, 
                              int fieldAssociation, 
                              const char *name);
  virtual void SetInputArrayToProcess(int idx, int port, int connection, 
                              int fieldAssociation, 
                              int fieldAttributeType);
  virtual void SetInputArrayToProcess(int idx, vtkInformation *info);


  virtual void SetInputArrayToProcess(int idx, int port, int connection, 
                              const char* fieldAssociation, 
                              const char* attributeTypeorName);

  vtkInformation *GetInputArrayInformation(int idx);
  
  // from here down are convenience methods that really are executive methods
  
  
  
  void RemoveAllInputs();

  vtkDataObject* GetOutputDataObject(int port);
  

  vtkDataObject *GetInputDataObject(int port,
                                    int connection);
  

  virtual void SetInputConnection(int port, vtkAlgorithmOutput* input);
  virtual void SetInputConnection(vtkAlgorithmOutput* input);


  virtual void AddInputConnection(int port, vtkAlgorithmOutput* input);
  virtual void AddInputConnection(vtkAlgorithmOutput* input);

  virtual void RemoveInputConnection(int port, vtkAlgorithmOutput* input);


  vtkAlgorithmOutput* GetOutputPort(int index);
  vtkAlgorithmOutput* GetOutputPort() {
    return this->GetOutputPort(0); }

  int GetNumberOfInputConnections(int port);

  int GetTotalNumberOfInputConnections();

  vtkAlgorithmOutput* GetInputConnection(int port, int index);

  virtual void Update();

  virtual void UpdateInformation();

  virtual void UpdateWholeExtent();

  void ConvertTotalInputToPortConnection(int ind, int& port, int& conn);

  //======================================================================
  //The following block of code is to support old style VTK applications. If
  //you are using these calls there are better ways to do it in the new
  //pipeline
  //======================================================================
  

  virtual void SetReleaseDataFlag(int);
  virtual int GetReleaseDataFlag();
  void ReleaseDataFlagOn();
  void ReleaseDataFlagOff();

  //========================================================================
  

  int UpdateExtentIsEmpty(vtkDataObject *output);
  int UpdateExtentIsEmpty(vtkInformation *pinfo, int extentType);

  static void SetDefaultExecutivePrototype(vtkExecutive* proto);

  virtual double ComputePriority();


  static vtkInformationIntegerKey* PRESERVES_DATASET();
  static vtkInformationIntegerKey* PRESERVES_GEOMETRY();
  static vtkInformationIntegerKey* PRESERVES_BOUNDS();
  static vtkInformationIntegerKey* PRESERVES_TOPOLOGY();
  static vtkInformationIntegerKey* PRESERVES_ATTRIBUTES();
  static vtkInformationIntegerKey* PRESERVES_RANGES();

protected:
  vtkAlgorithm();
  ~vtkAlgorithm();

  // Keys used to indicate that input/output port information has been
  // filled.
  static vtkInformationIntegerKey* PORT_REQUIREMENTS_FILLED();

  // Arbitrary extra information associated with this algorithm
  vtkInformation* Information;

  virtual int FillInputPortInformation(int port, vtkInformation* info);

  virtual int FillOutputPortInformation(int port, vtkInformation* info);

  virtual void SetNumberOfInputPorts(int n);

  virtual void SetNumberOfOutputPorts(int n);

  // Helper methods to check input/output port index ranges.
  int InputPortIndexInRange(int index, const char* action);
  int OutputPortIndexInRange(int index, const char* action);

  vtkDataArray *GetInputArrayToProcess(int idx,vtkInformationVector **inputVector);


  vtkDataArray *GetInputArrayToProcess(int idx,
                                       int connection,
                                       vtkInformationVector **inputVector);
  vtkDataArray *GetInputArrayToProcess(int idx, 
                                       vtkDataObject* input);


  vtkAbstractArray *GetInputAbstractArrayToProcess(int idx,vtkInformationVector **inputVector);


  vtkAbstractArray *GetInputAbstractArrayToProcess(int idx,
                                       int connection,
                                       vtkInformationVector **inputVector);
  vtkAbstractArray *GetInputAbstractArrayToProcess(int idx, 
                                       vtkDataObject* input);


  

  vtkInformation *GetInputArrayFieldInformation(int idx, 
                                                vtkInformationVector **inputVector);
  
    
  virtual vtkExecutive* CreateDefaultExecutive();


  vtkSetMacro( ErrorCode, unsigned long );
  unsigned long ErrorCode;

  // Progress/Update handling
  double Progress;
  char  *ProgressText;

  // Garbage collection support.
  virtual void ReportReferences(vtkGarbageCollector*);

  // executive methods below
  

  virtual void SetNthInputConnection(int port, int index,
                                     vtkAlgorithmOutput* input);

  virtual void SetNumberOfInputConnections(int port, int n);

  static vtkExecutive* DefaultExecutivePrototype;

private:
  vtkExecutive* Executive;
  vtkInformationVector* InputPortInformation;
  vtkInformationVector* OutputPortInformation;
  vtkAlgorithmInternals* AlgorithmInternal;
  static void ConnectionAdd(vtkAlgorithm* producer, int producerPort,
                            vtkAlgorithm* consumer, int consumerPort);
  static void ConnectionRemove(vtkAlgorithm* producer, int producerPort,
                               vtkAlgorithm* consumer, int consumerPort);
  static void ConnectionRemoveAllInput(vtkAlgorithm* consumer, int port);
  static void ConnectionRemoveAllOutput(vtkAlgorithm* producer, int port);

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

#endif

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