Method RequestData

Filters/ParallelImaging/vtkExtractPiece.cxx:68–131

=============================================================================

//=============================================================================
int vtkExtractPiece::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  // get the info objects
  vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
  vtkInformation* outInfo = outputVector->GetInformationObject(0);

  // get the input and output
  vtkCompositeDataSet* input =
    vtkCompositeDataSet::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));
  if (!input)
  {
    return 0;
  }
  vtkCompositeDataSet* output =
    vtkCompositeDataSet::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));
  if (!output)
  {
    return 0;
  }

  // Copy structure and meta-data.
  output->CopyStructure(input);

  int updateNumPieces = outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_NUMBER_OF_PIECES());
  int updatePiece = outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_PIECE_NUMBER());
  int updateGhostLevel =
    outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_NUMBER_OF_GHOST_LEVELS());

  vtkCompositeDataIterator* iter = input->NewIterator();
  for (iter->InitTraversal(); !iter->IsDoneWithTraversal(); iter->GoToNextItem())
  {
    vtkDataObject* tmpDS = iter->GetCurrentDataObject();
    switch (tmpDS->GetDataObjectType())
    {
      case VTK_IMAGE_DATA:
        this->ExtractImageData(
          (vtkImageData*)(tmpDS), output, updatePiece, updateNumPieces, updateGhostLevel, iter);
        break;
      case VTK_POLY_DATA:
        this->ExtractPolyData(
          (vtkPolyData*)(tmpDS), output, updatePiece, updateNumPieces, updateGhostLevel, iter);
        break;
      case VTK_RECTILINEAR_GRID:
        this->ExtractRectilinearGrid((vtkRectilinearGrid*)(tmpDS), output, updatePiece,
          updateNumPieces, updateGhostLevel, iter);
        break;
      case VTK_STRUCTURED_GRID:
        this->ExtractStructuredGrid((vtkStructuredGrid*)(tmpDS), output, updatePiece,
          updateNumPieces, updateGhostLevel, iter);
        break;
      case VTK_UNSTRUCTURED_GRID:
        this->ExtractUnstructuredGrid((vtkUnstructuredGrid*)(tmpDS), output, updatePiece,
          updateNumPieces, updateGhostLevel, iter);
        break;
      default:
        vtkErrorMacro("Cannot extract data of type " << tmpDS->GetClassName());
        break;