java - Orika 没有映射列表中的空元素

Question

我有以下类(class):

public class A{
    List<AA> aaList;

    public A(List<AA> aaList){
        this.aaList = aaList;
    }

    //getters and setters + default constructor

    public class AA {
        String aaString;
        public AA(String aaString){
            this.aaString = aaString;
        }

        //getters and setters + default constructor
    }
}

我想拥有同一个类的两个对象，比方说:

A a = new A(Arrays.asList(new A.AA(null)));
A a2 = new A(Arrays.asList(new A.AA("test")));

当我将 a 映射到 a2 时，a2 应该保持 test 因为 a 有一个 null。

如何使用 Orika 配置它？

我试过类似的方法:

mapperFactory.classMap(A.AA.class, A.AA.class)
            .mapNulls(false)
            .byDefault()
            .register();

    mapperFactory.classMap(A.class, A.class)
            .mapNulls(false)
            .customize(new CustomMapper<A, A>() {
                @Override public void mapAtoB(A a, A a2,
                        MappingContext context) {
                    map(a.getAAList(), a2.getAAList());
                }
            })
            .byDefault()
            .register();

提前致谢

Answer 1

这是对我有用的修改后的代码片段:

mapperFactory.classMap(A.class, A.class)
    .mapNulls(false)
    .customize(new CustomMapper<A, A>() {
        @Override
        public void mapAtoB(A a, A a2, MappingContext context) {
            // 1. Returns new list with not null
            List<A.AA> a1List = a.getAaList().stream()
                    .filter(a1 -> a1.getAaString() != null)
                    .collect(Collectors.toList());

            // 2. Merges all the elements from 'a2' list into 'a' list
            a1List.addAll(a2.getAaList());

            // 3. Sets the list with merged elements into the 'a2'
            a2.setAaList(a1List);
        }
    })
    .register();

请注意，应删除 .byDefault() 以使自定义映射器正常工作。