private function getArtifactXMLExporter(Tracker_XML_ChildrenCollector $children_collector, Tracker_XML_Exporter_FilePathXMLExporter $file_path_xml_exporter, PFUser $current_user, UserXMLExporter $user_xml_exporter)
 {
     $builder = new Tracker_XML_Exporter_ArtifactXMLExporterBuilder();
     return $builder->build($children_collector, $file_path_xml_exporter, $current_user, $user_xml_exporter);
 }
 private function getArtifactXMLExporter(Tracker_XML_ChildrenCollector $children_collector, PFUser $current_user)
 {
     $builder = new Tracker_XML_Exporter_ArtifactXMLExporterBuilder();
     return $builder->build($children_collector, $current_user);
 }