Method ReadMetaData

Common/ExecutionModel/vtkSimpleReader.cxx:100–155

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

//------------------------------------------------------------------------------
int vtkSimpleReader::ReadMetaData(vtkInformation* metadata)
{
  if (this->HasTemporalMetaData)
  {
    metadata->Set(vtkStreamingDemandDrivenPipeline::TIME_DEPENDENT_INFORMATION(), 1);
  }
  else
  {
    if (!this->Internal->FileNames.empty())
    {
      // Call the meta-data function on the first file.
      int retval = this->ReadMetaDataSimple(this->Internal->FileNames[0], metadata);
      if (!retval)
      {
        return retval;
      }
    }
  }

  if (this->Internal->FileNames.empty())
  {
    // No file names specified. No meta-data. There is still
    // no need to return with an error.
    return 1;
  }

  size_t nTimes = this->Internal->FileNames.size();
  std::vector<double> times(nTimes);

  bool hasTime = true;
  auto iter = times.begin();
  for (const auto& fname : this->Internal->FileNames)
  {
    auto time = this->GetTimeValue(fname);
    if (vtkMath::IsNan(time))
    {
      hasTime = false;
      break;
    }
    *iter++ = time;
  }

  if (!hasTime)
  {
    std::iota(times.begin(), times.end(), 0);
  }

  double timeRange[2];
  timeRange[0] = times[0];
  timeRange[1] = times[nTimes - 1];

  metadata->Set(vtkStreamingDemandDrivenPipeline::TIME_STEPS(), times.data(), (int)nTimes);
  metadata->Set(vtkStreamingDemandDrivenPipeline::TIME_RANGE(), timeRange, 2);

  return 1;
}

//------------------------------------------------------------------------------