Method RequestData

IO/NetCDF/vtkNetCDFReader.cxx:405–494

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

//------------------------------------------------------------------------------
int vtkNetCDFReader::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** vtkNotUsed(inputVector), vtkInformationVector* outputVector)
{
  vtkInformation* outInfo = outputVector->GetInformationObject(0);
  // If the output is not a vtkDataSet, then the subclass needs to override
  // this method.
  vtkDataSet* output = vtkDataSet::GetData(outInfo);
  if (!output)
  {
    vtkErrorMacro(<< "Bad output type.");
    return 0;
  }

  // Set up the extent for regular-grid type data sets.
  vtkImageData* imageOutput = vtkImageData::SafeDownCast(output);
  vtkRectilinearGrid* rectOutput = vtkRectilinearGrid::SafeDownCast(output);
  vtkStructuredGrid* structOutput = vtkStructuredGrid::SafeDownCast(output);
  outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_EXTENT(), this->UpdateExtent);
  if (imageOutput)
  {
    imageOutput->SetExtent(this->UpdateExtent);
  }
  else if (rectOutput)
  {
    rectOutput->SetExtent(this->UpdateExtent);
  }
  else if (structOutput)
  {
    structOutput->SetExtent(this->UpdateExtent);
  }
  else
  {
    // Superclass should handle extent setup if necessary.
  }

  // Get requested time step.
  double time = 0.0;
  if (outInfo->Has(vtkStreamingDemandDrivenPipeline::UPDATE_TIME_STEP()))
  {
    time = outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_TIME_STEP());
  }

  int ncFD;
  CALL_NETCDF_INT(this->Accessor->open(this->FileName, NC_NOWRITE, &ncFD));

  this->ComputeArraySelection();
  // Iterate over arrays and load selected ones.
  int numArrays = this->VariableArraySelection->GetNumberOfArrays();
  for (int arrayIndex = 0; arrayIndex < numArrays; arrayIndex++)
  {
    if (!this->VariableArraySelection->GetArraySetting(arrayIndex))
      continue;

    const char* name = this->VariableArraySelection->GetArrayName(arrayIndex);

    if (!this->LoadVariable(ncFD, name, time, output))
      return 0;
  }