question: get parent , or self if no parent . concode_field_sep int index concode_elem_sep ArrayList childList concode_elem_sep TreeLevel parent concode_elem_sep boolean child concode_field_sep List getChildren concode_elem_sep String toString concode_elem_sep void main concode_elem_sep int addChild concode_elem_sep boolean isChild
target: TreeLevel function ( ) { return parent ; }