Method SetNthInputConnection

Common/ExecutionModel/vtkAlgorithm.cxx:1431–1483

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//------------------------------------------------------------------------------
void vtkAlgorithm::SetNthInputConnection(int port, int index, vtkAlgorithmOutput* input)
{
  if (!this->InputPortIndexInRange(port, "replace connection"))
  {
    return;
  }

  // Get the producer/consumer pair for the connection.
  vtkExecutive* producer =
    (input && input->GetProducer()) ? input->GetProducer()->GetExecutive() : nullptr;
  int producerPort = producer ? input->GetIndex() : 0;
  vtkExecutive* consumer = this->GetExecutive();
  int consumerPort = port;

  // Get the vector of connected input information objects.
  vtkInformationVector* inputs = consumer->GetInputInformation(consumerPort);

  // Check for any existing connection with this index.
  vtkInformation* oldInfo = inputs->GetInformationObject(index);

  // Get the information object from the producer of the input.
  vtkInformation* newInfo = producer ? producer->GetOutputInformation(producerPort) : nullptr;

  // If the connection has not changed, do nothing.
  if (newInfo == oldInfo)
  {
    return;
  }

  // Set the connection.
  vtkDebugMacro("Setting connection index "
    << index << " to input port index " << consumerPort << " from output port index "
    << producerPort << " on algorithm "
    << (producer ? producer->GetAlgorithm()->GetObjectDescription() : "nullptr") << ".");

  // Add the consumer to the new input's list of consumers.
  if (newInfo)
  {
    vtkExecutive::CONSUMERS()->Append(newInfo, consumer, consumerPort);
  }

  // Remove the consumer from the old input's list of consumers.
  if (oldInfo)
  {
    vtkExecutive::CONSUMERS()->Remove(oldInfo, consumer, consumerPort);
  }

  // Store the information object in the vector of input connections.
  inputs->SetInformationObject(index, newInfo);

  // This algorithm has been modified.
  this->Modified();
}

//------------------------------------------------------------------------------
void vtkAlgorithm::SetNumberOfInputConnections(int port, int n)