java - ModelMapper如何使用when条件

Question

我在严格模式下使用 ModelMapper

public class Student {
    private String fullName;
    private Address address ;
}

public class StudentDto {
    private String fullName;
    private String street;
    private String city;
}

public class Address {
    private String street;
    private String city;
}

map (来源:学生到目的地:StudentDto)

为了在地址为空时转义映射，我设置了以下条件

Condition<Student, StudentDto> conditionAddressIsNull = new Condition<Student, StudentDto>() {
    public boolean applies(MappingContext<Student, StudentDto> context) {
        return context.getSource().getAddress() == null;
    }
};

PropertyMap<Student, StudentDto> propertryMapToStudentDto = new PropertyMap<Student, StudentDto>() {
    protected void configure() {
        when(conditionAddressIsNull).map(source).setStreet(null);
        when(conditionAddressIsNull).map(source).setCity(null);
    }
};

问题是:即使地址不为空，我也获得等于空的街道和城市如何使用严格映射来解决这个问题

Answer 1

您应该使用 when(**conditionAddressIsNotNull**) 而不是 when(**conditionAddressIsNull**)。

when(condition).map() 意思是:当condition=true时，我们进行映射；否则，我们跳过。

我建议你可以尝试

PropertyMap<Student, StudentDto> propertryMapToStudentDto = new PropertyMap<Student, StudentDto>() {
    protected void configure() {
        when(conditionAddressIsNotNull).map().setStreet(source.getAddress().geStreet());
        when(conditionAddressIsNotNull).map().setCity(source.getAddress().getCity());
    }
};