如果shipping.status==Status.Opened，我应该将ShipmentResponseDto.cargo.packaging.lastMeasurements中的几个字段返回为null，如下所示：

if(shipment.status=Status.Opened){
   ShipmentResponseDto.cargo.packaging.lastMeasurements.firstField = null;
   ShipmentResponseDto.cargo.packaging.lastMeasurements.secondField = null;
}

我想在mapstruct中完成，整个问题是答案是由两个Map器组装而成的，我没有成功地实现这一点。

@Mapper(uses = {
    CargoPackagingMapper.class
})
public interface ShipmentMapper extends BasicMapper<ShipmentResponseDto, Shipment> {

}

@Mapper(uses = {PackagingTypeMapper.class})
public abstract class CargoPackagingMapper implements BasicMapper<CargoPackagingResponseDto, Packaging> {

    @Override
    @Mappings(...)
    public abstract CargoPackagingResponseDto toDto(Packaging source);
}

public class Shipment {

    ...
    ...
   @Enumerated(EnumType.STRING)
    private Status status;
    private Set<ShipmentCargo> cargo = new HashSet<>();
    ...
}

public class ShipmentCargo {
    ...
    @ManyToOne
    private Packaging packaging;
    ...

}
public class Packaging {
    ...
    
    private PackagingLastMeasurements lastMeasurements;
    ...

}