question: method used to known the last known information about a routes ` freshness ' concode_field_sep HashMap<Integer,ForwardRouteEntry> entries concode_elem_sep LinkedList<ForwardRouteEntry> sortedEntries concode_elem_sep Object tableLock concode_field_sep boolean removeEntry concode_elem_sep void setValid concode_elem_sep boolean updateForwardRouteEntry concode_elem_sep boolean addForwardRouteEntry concode_elem_sep ForwardRouteEntry getForwardRouteEntry concode_elem_sep boolean isEmpty concode_elem_sep String toString concode_elem_sep ArrayList<RERR> findBrokenRoutes concode_elem_sep RouteEntry getNextRouteToExpire concode_elem_sep ArrayList<Integer> getPrecursors
target: int function ( int arg0 ) { RouteEntry loc0 = entries . get ( arg0 ) ; if ( loc0 != null ) { return loc0 . getDestinationSequenceNumber ( ) ; } throw new NoSuchRouteException ( ) ; }