question: visit the specified white node . if this node has not already been visited , the white hook is called and true is returned ; otherwise , false is returned . concode_field_sep Map<WHITE,Integer> visitedWhiteNodes concode_elem_sep int nextNodeId concode_elem_sep Map<BLACK,Integer> visitedBlackNodes concode_field_sep void white concode_elem_sep boolean visitBlackNode concode_elem_sep void black concode_elem_sep void visitBlackNodes concode_elem_sep void visitWhiteNodes
target: boolean function ( WHITE arg0 ) { if ( arg0 == null ) { throw new NullPointerException ( ) ; } if ( ! visitedWhiteNodes . containsKey ( arg0 ) ) { visitedWhiteNodes . put ( arg0 , nextNodeId ++ ) ; white ( arg0 ) ; return true ; } return false ; }