Method RequestData

Filters/Sources/vtkSelectionSource.cxx:814–1095

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

//------------------------------------------------------------------------------
int vtkSelectionSource::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** vtkNotUsed(inputVector), vtkInformationVector* outputVector)
{
  vtkSelection* outputSel = vtkSelection::GetData(outputVector);
  if (!this->Expression.empty())
  {
    outputSel->SetExpression(this->Expression);
  }
  vtkInformation* outInfo = outputVector->GetInformationObject(0);

  int piece = outInfo->Has(vtkStreamingDemandDrivenPipeline::UPDATE_PIECE_NUMBER())
    ? outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_PIECE_NUMBER())
    : 0;

  int fieldType = this->FieldTypeOption == FieldTypeOptions::FIELD_TYPE
    ? this->FieldType
    : vtkSelectionNode::ConvertAttributeTypeToSelectionField(this->ElementType);

  for (unsigned int nodeId = 0; nodeId < this->GetNumberOfNodes(); ++nodeId)
  {
    const auto& nodeInfo = this->NodesInfo[nodeId];
    vtkNew<vtkSelectionNode> node;
    if (!nodeInfo->Name.empty())
    {
      outputSel->SetNode(nodeInfo->Name, node);
    }
    else
    {
      outputSel->AddNode(node);
    }
    vtkInformation* oProperties = node->GetProperties();

    if (outInfo->Has(vtkStreamingDemandDrivenPipeline::UPDATE_PIECE_NUMBER()))
    {
      if (this->ProcessID >= 0)
      {
        oProperties->Set(vtkSelectionNode::PROCESS_ID(), this->ProcessID);
      }
    }
    if (nodeInfo->CompositeIndex >= 0)
    {
      oProperties->Set(vtkSelectionNode::COMPOSITE_INDEX(), nodeInfo->CompositeIndex);
    }

    if (nodeInfo->HierarchicalLevel >= 0 && nodeInfo->HierarchicalIndex >= 0)
    {
      oProperties->Set(vtkSelectionNode::HIERARCHICAL_LEVEL(), nodeInfo->HierarchicalLevel);
      oProperties->Set(vtkSelectionNode::HIERARCHICAL_INDEX(), nodeInfo->HierarchicalIndex);
    }

    if (!nodeInfo->AssemblyName.empty() && !nodeInfo->Selectors.empty())
    {
      oProperties->Set(vtkSelectionNode::ASSEMBLY_NAME(), nodeInfo->AssemblyName.c_str());
      for (auto& selector : nodeInfo->Selectors)
      {
        oProperties->Append(vtkSelectionNode::SELECTORS(), selector.c_str());
      }
    }