Method RequestData

IO/SQL/vtkSQLGraphReader.cxx:84–188

vtkCxxSetObjectMacro(vtkSQLGraphReader, EdgeQuery, vtkSQLQuery);

int vtkSQLGraphReader::RequestData(
  vtkInformation*, vtkInformationVector**, vtkInformationVector* outputVector)
{
  // Check for valid inputs
  if (this->EdgeQuery == nullptr)
  {
    vtkErrorMacro("The EdgeQuery must be defined");
    return 0;
  }
  if (this->SourceField == nullptr)
  {
    vtkErrorMacro("The SourceField must be defined");
    return 0;
  }
  if (this->TargetField == nullptr)
  {
    vtkErrorMacro("The TargetField must be defined");
    return 0;
  }
  if (this->VertexQuery != nullptr)
  {
    if (this->VertexIdField == nullptr)
    {
      vtkErrorMacro("The VertexIdField must be defined when using a VertexQuery");
      return 0;
    }
    if (this->XField != nullptr && this->YField == nullptr)
    {
      vtkErrorMacro("The YField must be defined if the XField is defined");
      return 0;
    }
  }

  vtkGraph* output = vtkGraph::GetData(outputVector);

  vtkTableToGraph* filter = vtkTableToGraph::New();
  filter->SetDirected(this->Directed);

  // Set up the internal filter to use the edge table
  vtkSmartPointer<vtkRowQueryToTable> edgeReader = vtkSmartPointer<vtkRowQueryToTable>::New();
  edgeReader->SetQuery(this->EdgeQuery);
  edgeReader->Update();

  const char* domain = "default";
  if (this->VertexIdField)
  {
    domain = this->VertexIdField;
  }

  filter->SetInputConnection(edgeReader->GetOutputPort());
  filter->AddLinkVertex(this->SourceField, domain);
  filter->AddLinkVertex(this->TargetField, domain);
  filter->AddLinkEdge(this->SourceField, this->TargetField);

  vtkSmartPointer<vtkAssignCoordinates> assign = vtkSmartPointer<vtkAssignCoordinates>::New();
  assign->SetInputConnection(filter->GetOutputPort());

  // Set up the internal filter to use the vertex table