question: private static Map < String , Object > addMapObject ( Map < String , Object > props , String key ) { Object v = props . get ( key ) ; if ( v == null ) return props ; List < String > val = new ArrayList < > ( ) ; if ( v instanceof String [ ] ) { val . addAll ( Arrays . asList ( ( String [ ] ) v ) ) ; } else { val . add ( v . toString ( ) ) ; } if ( val . size ( ) > 0 ) { ArrayList < Map > l = new ArrayList < > ( ) ; for ( String rule : val ) l . add ( Rule . parseRule ( rule ) ) ; props . put ( key , l ) ; } return props ; }
target:  Converts a String of the form a:b,c:d to a Map