Method SetInputDataObject

Common/ExecutionModel/vtkAlgorithm.cxx:1994–2029

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
void vtkAlgorithm::SetInputDataObject(int port, vtkDataObject* input)
{
  if (input == nullptr)
  {
    // Setting a nullptr input removes the connection.
    this->SetInputConnection(port, nullptr);
    return;
  }

  // We need to setup a trivial producer connection. However, we need to ensure
  // that the input is indeed different from what's currently setup otherwise
  // the algorithm will be modified unnecessarily. This will make it possible
  // for users to call SetInputData(..) with the same data-output and not have
  // the filter re-execute unless the data really changed.

  if (!this->InputPortIndexInRange(port, "connect"))
  {
    return;
  }

  if (this->GetNumberOfInputConnections(port) == 1)
  {
    vtkAlgorithmOutput* current = this->GetInputConnection(port, 0);
    vtkAlgorithm* producer = current ? current->GetProducer() : nullptr;
    if (vtkTrivialProducer::SafeDownCast(producer) && producer->GetOutputDataObject(0) == input)
    {
      // the data object is unchanged. Nothing to do here.
      return;
    }
  }

  vtkTrivialProducer* tp = vtkTrivialProducer::New();
  tp->SetOutput(input);
  this->SetInputConnection(port, tp->GetOutputPort());
  tp->Delete();
}

//------------------------------------------------------------------------------
void vtkAlgorithm::AddInputDataObject(int port, vtkDataObject* input)