Method SetupUpdateExtent

IO/XML/vtkXMLPTableReader.cxx:465–500

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//------------------------------------------------------------------------------
void vtkXMLPTableReader::SetupUpdateExtent(int piece, int numberOfPieces)
{
  this->UpdatePieceId = piece;
  this->UpdateNumberOfPieces = numberOfPieces;

  // If more pieces are requested than available, just return empty
  // pieces for the extra ones
  this->UpdateNumberOfPieces = std::min(this->UpdateNumberOfPieces, this->NumberOfPieces);

  // Find the range of pieces to read.
  if (this->UpdatePieceId < this->UpdateNumberOfPieces)
  {
    this->StartPiece = (this->UpdatePieceId * this->NumberOfPieces) / this->UpdateNumberOfPieces;
    this->EndPiece =
      ((this->UpdatePieceId + 1) * this->NumberOfPieces) / this->UpdateNumberOfPieces;
  }
  else
  {
    this->StartPiece = 0;
    this->EndPiece = 0;
  }

  // Update the information of the pieces we need.
  for (int i = this->StartPiece; i < this->EndPiece; ++i)
  {
    if (this->CanReadPiece(i))
    {
      this->PieceReaders[i]->UpdateInformation();
      vtkXMLTableReader* pReader = this->PieceReaders[i];
      pReader->SetupUpdateExtent(0, 1);
    }
  }

  // Find the total size of the output.
  this->SetupOutputTotals();
}

//------------------------------------------------------------------------------
vtkIdType vtkXMLPTableReader::GetNumberOfRowsInPiece(int piece)