Method WriteComposite

IO/XML/vtkXMLMultiBlockDataWriter.cxx:28–121

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//------------------------------------------------------------------------------
int vtkXMLMultiBlockDataWriter::WriteComposite(
  vtkCompositeDataSet* compositeData, vtkXMLDataElement* parent, int& writerIdx)
{
  if (!(compositeData->IsA("vtkMultiBlockDataSet") || compositeData->IsA("vtkMultiPieceDataSet")))
  {
    vtkErrorMacro("Unsupported composite dataset type: " << compositeData->GetClassName() << ".");
    return 0;
  }

  // Write each input.
  vtkSmartPointer<vtkDataObjectTreeIterator> iter;
  iter.TakeReference(vtkDataObjectTree::SafeDownCast(compositeData)->NewTreeIterator());
  iter->VisitOnlyLeavesOff();
  iter->TraverseSubTreeOff();
  iter->SkipEmptyNodesOff();
  int toBeWritten = 0;
  for (iter->InitTraversal(); !iter->IsDoneWithTraversal(); iter->GoToNextItem())
  {
    toBeWritten++;
  }

  if (toBeWritten == 0)
  {
    // No leaf, nothing to write but this is not an issue.
    return 1;
  }

  float progressRange[2] = { 0.f, 0.f };
  this->GetProgressRange(progressRange);

  int index = 0;
  int RetVal = 0;
  for (iter->InitTraversal(); !iter->IsDoneWithTraversal(); iter->GoToNextItem(), index++)
  {
    vtkDataObject* curDO = iter->GetCurrentDataObject();
    const char* name = nullptr;
    if (iter->HasCurrentMetaData())
    {
      name = iter->GetCurrentMetaData()->Get(vtkCompositeDataSet::NAME());
    }

    if (curDO && curDO->IsA("vtkCompositeDataSet"))
    // if node is a supported composite dataset
    // note in structure file and recurse.
    {
      vtkXMLDataElement* tag = vtkXMLDataElement::New();
      if (name)
      {
        tag->SetAttribute("name", name);
      }

      if (curDO->IsA("vtkMultiPieceDataSet"))
      {
        tag->SetName("Piece");
        tag->SetIntAttribute("index", index);
      }
      else if (curDO->IsA("vtkMultiBlockDataSet"))
      {