question: private boolean isFieldVisited ( Object object , Field objectField , Field field ) { Map < String , Set < String > > bag = visitedFields . get ( object ) ; if ( bag == null ) { return false ; } String objectFiledKey = objectField == null ? "" : objectField . toGenericString ( ) ; Set < String > fields = bag . get ( objectFiledKey ) ; return fields != null && fields . contains ( field ) ; }
target:  Indicates whether the field of a target object is visited