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Program: Visualization Toolkit
Module: vtkExecutive.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or for details.
This software is distributed WITHOUT ANY WARRANTY; without even
PURPOSE. See the above copyright notice for more information.
// .NAME vtkExecutive - Superclass for all pipeline executives in VTK.
// .SECTION Description
// vtkExecutive is the superclass for all pipeline executives in VTK.
// A VTK executive is responsible for controlling one instance of
// vtkAlgorithm. A pipeline consists of one or more executives that
// control data flow. Every reader, source, writer, or data
// processing algorithm in the pipeline is implemented in an instance
// of vtkAlgorithm.
#ifndef __vtkExecutive_h
#define __vtkExecutive_h
#include "vtkObject.h"
class vtkAlgorithm;
class vtkAlgorithmOutput;
class vtkAlgorithmToExecutiveFriendship;
class vtkDataObject;
class vtkExecutiveInternals;
class vtkInformation;
class vtkInformationExecutivePortKey;
class vtkInformationExecutivePortVectorKey;
class vtkInformationIntegerKey;
class vtkInformationRequestKey;
class vtkInformationKeyVectorKey;
class vtkInformationVector;
class VTK_FILTERING_EXPORT vtkExecutive : public vtkObject
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Get the algorithm to which this executive has been assigned.
vtkAlgorithm* GetAlgorithm();
// Description:
// Generalized interface for asking the executive to fullfill
// pipeline requests.
virtual int ProcessRequest(vtkInformation* request,
vtkInformationVector** inInfo,
vtkInformationVector* outInfo);
// Description:
// A special version of ProcessRequest meant specifically for the
// pipeline modified time request. This is an optimization since
// the request is called so often and it travels the full length of
// the pipeline. We augment the signature with method arguments
// containing the common information, specifically the output port
// through which the request was made and the resulting modified
// time. Note that unlike ProcessRequest the request information
// object may be NULL for this method. It also does not contain a
// request identifcation key because the request is known from the
// method name.
virtual int
ComputePipelineMTime(vtkInformation* request,
vtkInformationVector** inInfoVec,
vtkInformationVector* outInfoVec,
int requestFromOutputPort,
unsigned long* mtime);
// Description:
// Bring the algorithm's outputs up-to-date. Returns 1 for success
// and 0 for failure.
virtual int Update();
virtual int Update(int port);
// Description:
// Get the number of input/output ports for the algorithm associated
// with this executive. Returns 0 if no algorithm is set.
int GetNumberOfInputPorts();
int GetNumberOfOutputPorts();
// Description:
// Get the number of input connections on the given port.
int GetNumberOfInputConnections(int port);
// Description:
// Get the pipeline information object for the given output port.
virtual vtkInformation* GetOutputInformation(int port);
// Description:
// Get the pipeline information object for all output ports.
vtkInformationVector* GetOutputInformation();
// Description:
// Get the pipeline information for the given input connection.
vtkInformation* GetInputInformation(int port, int connection);
// Description:
// Get the pipeline information vectors for the given input port.
vtkInformationVector* GetInputInformation(int port);
// Description:
// Get the pipeline information vectors for all inputs
vtkInformationVector** GetInputInformation();
// Description:
// Get the executive managing the given input connection.
vtkExecutive* GetInputExecutive(int port, int connection);
// Description:
// Get/Set the data object for an output port of the algorithm.
virtual vtkDataObject* GetOutputData(int port);
virtual void SetOutputData(int port, vtkDataObject*, vtkInformation *info);
virtual void SetOutputData(int port, vtkDataObject*);
// Description:
// Get the data object for an input port of the algorithm.
virtual vtkDataObject* GetInputData(int port, int connection);
virtual vtkDataObject* GetInputData(int port, int connection,
vtkInformationVector **inInfoVec);
// Description:
// Get the output port that produces the given data object.
virtual vtkAlgorithmOutput* GetProducerPort(vtkDataObject*);
// Description:
// Set a pointer to an outside instance of input or output
// information vectors. No references are held to the given
// vectors, and setting this does not change the executive object
// modification time. This is a preliminary interface to use in
// implementing filters with internal pipelines, and may change
// without notice when a future interface is created.
void SetSharedInputInformation(vtkInformationVector** inInfoVec);
void SetSharedOutputInformation(vtkInformationVector* outInfoVec);
// Description:
// Participate in garbage collection.
virtual void Register(vtkObjectBase* o);
virtual void UnRegister(vtkObjectBase* o);
// Description:
// Information key to store the executive/port number producing an
// information object.
static vtkInformationExecutivePortKey* PRODUCER();
// Description:
// Information key to store the executive/port number pairs
// consuming an information object.
static vtkInformationExecutivePortVectorKey* CONSUMERS();
// Description:
// Information key to store the output port number from which a
// request is made.
static vtkInformationIntegerKey* FROM_OUTPUT_PORT();
// Description:
// Keys to program vtkExecutive::ProcessRequest with the default
// behavior for unknown requests.
static vtkInformationIntegerKey* ALGORITHM_BEFORE_FORWARD();
static vtkInformationIntegerKey* ALGORITHM_AFTER_FORWARD();
static vtkInformationIntegerKey* ALGORITHM_DIRECTION();
static vtkInformationIntegerKey* FORWARD_DIRECTION();
static vtkInformationKeyVectorKey* KEYS_TO_COPY();
enum { RequestUpstream, RequestDownstream };
enum { BeforeForward, AfterForward };
// Description:
// An API to CallAlgorithm that allows you to pass in the info objects to
// be used
virtual int CallAlgorithm(vtkInformation* request, int direction,
vtkInformationVector** inInfo,
vtkInformationVector* outInfo);
// Helper methods for subclasses.
int InputPortIndexInRange(int port, const char* action);
int OutputPortIndexInRange(int port, const char* action);
// Called by methods to check for a recursive pipeline update. A
// request should be fulfilled without making another request. This
// is used to help enforce that behavior. Returns 1 if no recursive
// request is occurring, and 0 otherwise. An error message is
// produced automatically if 0 is returned. The first argument is
// the name of the calling method (the one that should not be
// invoked recursively during an update). The second argument is
// the recursive request information object, if any. It is used to
// construct the error message.
int CheckAlgorithm(const char* method, vtkInformation* request);
virtual int ForwardDownstream(vtkInformation* request);
virtual int ForwardUpstream(vtkInformation* request);
virtual void CopyDefaultInformation(vtkInformation* request, int direction,
vtkInformationVector** inInfo,
vtkInformationVector* outInfo);
// Reset the pipeline update values in the given output information object.
virtual void ResetPipelineInformation(int port, vtkInformation*)=0;
// Bring the existence of output data objects up to date.
virtual int UpdateDataObject()=0;
// Garbage collection support.
virtual void ReportReferences(vtkGarbageCollector*);
virtual void SetAlgorithm(vtkAlgorithm* algorithm);
// The algorithm managed by this executive.
vtkAlgorithm* Algorithm;
// Flag set when the algorithm is processing a request.
int InAlgorithm;
// Pointers to an outside instance of input or output information.
// No references are held. These are used to implement internal
// pipelines.
vtkInformationVector** SharedInputInformation;
vtkInformationVector* SharedOutputInformation;
// Store an information object for each output port of the algorithm.
vtkInformationVector* OutputInformation;
// Internal implementation details.
vtkExecutiveInternals* ExecutiveInternal;
friend class vtkAlgorithmToExecutiveFriendship;
vtkExecutive(const vtkExecutive&); // Not implemented.
void operator=(const vtkExecutive&); // Not implemented.