ModelMapper：如何 map 到已知具体类型的通用实例列表

Question

I want to convert with the ModelMapper a List<> to a List<T> knowing the exact java.lang.Class of T . But the ModelMapper keeps only instantiating the common parent class of T...

for your context: I want to convert a list of DTO to a list of Domain, but as I do it in every Service class I extracted it in a generic abstract Service.

public class BaseClass {}
public class SubClass1 extends BaseClass {}

public <T extends BaseClass> List<T> getList(Class<T> specificClass) {
    ...
    Type listType = new TypeToken<List<T>>(){}.getType(); // here problem

    List<T> responseList = modelMapper.map(listIAlreadyHave, listType);

    return responseList;
}

List<SubClass1> list = doIt(SubClass1.class);

Inspiration here

I would like list to be a list of SubClass1 instances, but i get only BaseClass instances. I don't blame Java for not understading my listType definition because T is unknown on runntime, but how can i use the specificClass parameter i generously provide?

Thank you dear community!

Answer 1

You can use explicit mapping and specify the way mapper has to convert one instance to another. Didn't you meant to make SubClass1 extend BaseClass? If you meant to you could just take advantage of polymorphism.

Have a good day!