如何在Java mapstruct中将参数从列表映射器方法传递到对象映射器方法

Question

我无法从列表映射器(字符串公司)向对象映射器传递一些公共参数

@Mapper
public abstract class EmployeeMapper {
public abstract Employee getEmployeeFromDTO(EmployeeDTO employeeDTO, String 
company);
@AfterMapping
public void addCompany(@MappingTarget Employee employee, String company) {
   employee.setCompany(company);
}
public abstract List<Employee> getEmployeeFromDTOs(List<EmployeeDTO> employeeDTOs, 
String company);
}

起初，我使用的是接口而不是抽象类。而且没有@AfterMapping方法。事实上，我不知道如何正确地将其作为String公司@Context传递。有没有@Context和@AfterMapping，或者至少有它，所以我的问题是，当列表映射器getEmployeeFromDTO按顺序调用“item”mapper getEmployeeFromDTO时，如何传递“String company”。如果它被传递到最后一种方法，我会很容易地将常见的“公司”映射到员工，@Mapping因为 EmployeeDTO 没有这样的数据。我想另一种方法是使用@Context和@AfterMapping。在这种情况下，我应该把@AfterMapping方法放在相对映射方法之前还是之后？我是否应该将@AfterMapping方法放在 Employee/EmployeeDTO 类中？

Answer 1

以下是我的解决方案：

类别：

public class Message {
    private String level;
    private List<MessageData> messages;
}

public class MessageData {
    private String appId;
    private long dateCreated;
    private String type;
}


public class Event {
    private String type;
    private String processId;
    private List<EventData> events;
}

public class EventData {
    private String name;
    private long dateCreated;
}

解决方案#1：使用上下文

@Mapper
public interface MessageMapper2 {
    @Mapping(target = "level", constant = "MEDIUM")
    @Mapping(target = "messages", source = "event", qualifiedByName = "mapEventsToMessages")
    Message mapEvenToMessage(Event event, @Context String progressId);

    List<MessageData> mapEventsToMessages(List<EventData> events, @Context String progressId);


    @Mapping(target = "type", source = "name")
    @Mapping(target = "appId", expression = "java(progressId)")
    MessageData mapEventDataToMessageData(EventData eventData, @Context String progressId);

}

解决方案#2:如果属性在源对象内部，这个解决方案将会工作

消息数据。appId=event.processId

@Mapper
public interface MessageMapper {

        @Mapping(target = "level", constant = "MEDIUM")
        @Mapping(target = "messages", source = "event", qualifiedByName = "mapEventsToMessages")
        Message mapEvenToMessage(Event event);

        @Named("mapEventsToMessages")
        default List<MessageData> mapEventsToMessages(Event event) {
               return event.getEvents().stream()
                        .map(eventData -> new MessageData(event.getProcessId(), eventData.getDateCreated(), eventData.getName()))
                        .collect(Collectors.toList());
        }
}