Method NewDataAvailable

IO/XML/vtkRTXMLPolyDataReader.cxx:68–118

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

//------------------------------------------------------------------------------
int vtkRTXMLPolyDataReader::NewDataAvailable()
{
  // TODO: data concurrency issue
  // what if data is available partly on the file system
  // i.e. a data writer is writing the file, but not done yet
  // enforce the writer to obtain a "flock" is too restrictive, is it?

  // no data directory is specified, use the current dir
  if (!this->DataLocation)
  {
    this->InitializeToCurrentDir();
    return VTK_ERROR;
  }

  // now the reader should be initialized already
  if (!this->Internal->AvailableDataFileList.empty())
  {
    return VTK_OK;
  }

  vtkDirectory* dataDir = vtkDirectory::New();
  dataDir->Open(this->DataLocation);

  // now check if there are new files available
  // and place them into the AvailableDataFileList
  int current = dataDir->GetNumberOfFiles();
  int processed = static_cast<int>(this->Internal->ProcessedFileList.size());

  if (current > processed)
  {
    for (int i = 0; i < current; i++)
    {
      char* file = this->GetDataFileFullPathName(dataDir->GetFile(i));
      if (!IsProcessed(file))
      {
        this->Internal->AvailableDataFileList.emplace_back(file);
      }
      else
      {
        delete[] file;
      }
    }
    dataDir->Delete();
    return VTK_OK;
  }
  else
  {
    dataDir->Delete();
    return VTK_ERROR;
  }
}

// Description:
// Internal method to return the fullpath name of a file, which