Method RequestData

IO/GDAL/vtkGDALVectorReader.cxx:587–648

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

//------------------------------------------------------------------------------
int vtkGDALVectorReader::RequestData(
  vtkInformation* request, vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  (void)request;
  (void)inputVector;

  if (!this->FileName)
  {
    // vtkWarningMacro( "No filename specified" );
    return 0;
  }

  vtkMultiBlockDataSet* mbds = nullptr;
  vtkInformation* oi = outputVector->GetInformationObject(0);
  if (!oi)
  {
    return 0;
  }

  mbds = vtkMultiBlockDataSet::SafeDownCast(oi->Get(vtkDataObject::DATA_OBJECT()));
  if (!mbds)
  {
    return 0;
  }

  // Deleting this->Implementation is required in order to force re-reading each
  // time RequestData() is executed.
  delete this->Implementation;
  this->Implementation = nullptr;

  if (this->InitializeInternal() == VTK_ERROR)
  {
    return 1;
  }

  vtkGDALVectorReader::Internal* p = this->Implementation;

  int lastLayer = p->Source->GetLayerCount() - 1;
  int startLayer = this->ActiveLayer < 0 || this->ActiveLayer >= lastLayer ? 0 : this->ActiveLayer;
  int endLayer =
    this->ActiveLayer < 0 || this->ActiveLayer >= lastLayer ? lastLayer : this->ActiveLayer;
  for (int layerIdx = startLayer; layerIdx <= endLayer; ++layerIdx)
  {
    OGRLayer* layer = p->Source->GetLayer(layerIdx);
    if (!layer)
    {
      continue;
    }

    if (layer->GetSpatialRef())
    {
      char* projStr;
      layer->GetSpatialRef()->exportToWkt(&projStr);
      this->LayersProjection[layerIdx] = std::string(projStr);
      CPLFree(projStr);
    }

    p->ReadLayer(layer, mbds);