Method GetInputConnection

Common/ExecutionModel/vtkAlgorithm.cxx:1622–1648

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//------------------------------------------------------------------------------
vtkAlgorithmOutput* vtkAlgorithm::GetInputConnection(int port, int index)
{
  if (port < 0 || port >= this->GetNumberOfInputPorts())
  {
    vtkErrorMacro("Attempt to get connection index " << index << " for input port " << port
                                                     << ", for an algorithm with "
                                                     << this->GetNumberOfInputPorts() << " ports.");
    return nullptr;
  }
  if (index < 0 || index >= this->GetNumberOfInputConnections(port))
  {
    return nullptr;
  }
  if (vtkInformation* info = this->GetExecutive()->GetInputInformation(port, index))
  {
    // Get the executive producing this input.  If there is none, then
    // it is a nullptr input.
    vtkExecutive* producer;
    int producerPort;
    vtkExecutive::PRODUCER()->Get(info, producer, producerPort);
    if (producer)
    {
      return producer->GetAlgorithm()->GetOutputPort(producerPort);
    }
  }
  return nullptr;
}

//------------------------------------------------------------------------------
void vtkAlgorithm::Update()