英文:
MapStruct Is there a way to define defaut enum strategy for unknown value at class level?
问题
我正在寻找在映射器类级别上定义一种策略，即如果枚举值未映射，则将其映射为 null。
就像我在方法级别上写的那样：
@ValueMapping(source = MappingConstants.ANY_REMAINING, target = MappingConstants.NULL)
这样可以自动应用于由 MapStruct 自动生成的所有子映射方法，而无需强制我声明所有这些方法只是为了添加这行代码。
英文:
I'm looking to define at mapper class level, a strategy that said if an enum value is not mapped, to map it to null.
Just like i would write at method level:
@ValueMapping( source = MappingConstants.ANY_REMAINING, target = MappingConstants.NULL )
So that it applies to all sub mapping method automaticaly generated by mapstruct, without forcing me to declare all of them just to add this line.
答案1
得分: 2
创建一个用于枚举的 'class' 映射器，并在其他映射器中使用 @Mapper 注解的 uses 属性。
例如：
public interface MyEnumMapper {
@ValueMapping( source = MappingConstants.ANY_REMAINING, target = MappingConstants.NULL )
public String asString(MyEnum myenum);
}
然后在其他映射器中使用它：
@Mapper(uses=MyEnumMapper.class)
public class CarMapper {
CarDto carToCarDto(Car car);
}
（假设 Car 对象具有类型为 MyEnum 的属性）
详细文档请参阅：https://mapstruct.org/documentation/stable/reference/html/#invoking-other-mappers
英文:
Create a 'class' mapper for your enum and then use it in other mapper with the uses attribute of the @Mapper annotation.
For example :
public interface MyEnumMapper {
@ValueMapping( source = MappingConstants.ANY_REMAINING, target = MappingConstants.NULL )
public String asString(MyEnum myenum);
}
and then to use it
@Mapper(uses=MyEnumMapper.class)
public class CarMapper {
CarDto carToCarDto(Car car);
}
(assuming Car object has an attribute of type MyEnum)
see the full documentation here : https://mapstruct.org/documentation/stable/reference/html/#invoking-other-mappers
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