Method ShouldReadDataSet

IO/XML/vtkXMLCompositeDataReader.cxx:386–432

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//------------------------------------------------------------------------------
int vtkXMLCompositeDataReader::ShouldReadDataSet(
  unsigned int idx, unsigned int pieceIndex /*=0*/, unsigned int numPieces /*=0*/)
{
  // Apply the update restriction:
  if (this->Internal->HasUpdateRestriction)
  {
    auto iter = this->Internal->UpdateIndices.find(idx);
    if (iter == this->Internal->UpdateIndices.end())
    {
      return 0;
    }

    // Update the dataset index to its position in the update indices:
    idx = std::distance(this->Internal->UpdateIndices.begin(), iter);
  }

  unsigned int datasetIndex = idx;
  unsigned int numDatasets = this->Internal->NumDataSets;

  if (pieceIndex < numPieces)
  {
    // This dataset is part of a vtkParititionedDataSet or a
    // vtkMultiPieceDataset. Handle is differently.
    datasetIndex = pieceIndex;
    numDatasets = numPieces;
  }

  int assignment = -1;
  switch (this->PieceDistribution)
  {
    case vtkXMLCompositeDataReader::Block:
      assignment = vtkXMLCompositeDataReader::GetPieceAssignmentForBlockStrategy(
        datasetIndex, numDatasets, this->Internal->UpdateNumberOfPieces);
      break;

    case vtkXMLCompositeDataReader::Interleave:
      assignment = vtkXMLCompositeDataReader::GetPieceAssignmentForInterleaveStrategy(
        datasetIndex, numDatasets, this->Internal->UpdateNumberOfPieces);
      break;

    default:
      vtkErrorMacro("Invalid PieceDistribution setting: " << this->PieceDistribution);
      break;
  }

  return (assignment == this->Internal->UpdatePiece) ? 1 : 0;
}

//------------------------------------------------------------------------------
int vtkXMLCompositeDataReader::GetPieceAssignmentForBlockStrategy(