question: public Id < DgGreen > convertFromLinkIdToLinkId2LightId ( Id < Link > fromLinkId , Id < Lane > fromLaneId , Id < Link > toLinkId ) { String id = null ; if ( fromLaneId == null ) { id = fromLinkId . toString ( ) + "55" + toLinkId . toString ( ) ; } else { id = fromLinkId . toString ( ) + "66" + fromLaneId . toString ( ) + "55" + toLinkId . toString ( ) ; } String idString = id . toString ( ) ; return idPool . createId ( idString , DgGreen . class ) ; }
target:  creates a light id for a link to link relationship