推土机地图DTO映射

Question

I have a little "Object":

Map<Integer, Map<WeekDay, Map<String, Data>>> obj

and I want to Map it to:

Map<Integer, Map<WeekDay, Map<String, DataDto>>> returnObj

how can I achive this?

The way I wanted to use was this one:

map(schedule, Map<Integer.class, Map<WeekDay.class, Map<String.class, DataDto.class>>>);

but at the "Map" I am stuck, becuase I can't add a .class behind them and in this state it doesn't work...

Answer 1

I would suggest to simplify your Map if possible:

class A {
    WeekDay weekDay;
    String str;
    Data obj;
}

Map<Integer, A> map = ...;
Iterables.transform(map.values(), new Function<Data, DataDto>() {
            @Override
            public Object apply(String input) {
                return ...;
            }
        });

or you can put it inside your class:

class Dictionary {
    Map<Integer, Map<WeekDay, Map<String, Data>>> obj;

    getDataDto(Integer key, Weekday weekDay, String str) {
        final Data data = obj.get(key).get(weekDay).get(str);
        return (new Function<Data, DataDto>() {
            ...
        }).apply(data);
    }
}

Think about operations you are going to use over your data structure and come up with the proper class. Your nested map doesn't look okay.