使用Mapstruct将多个源字段映射到相同类型的目标字段

Question

考虑以下POJO：

public class SchedulePayload {
    public String name;
    public String scheduler;
    public PeriodPayload notificationPeriod;
    public PeriodPayload schedulePeriod;
}

private class Lecture {
    public ZonedDateTime start;
    public ZonedDateTime end;
}

public class XmlSchedule {
    public String scheduleName;
    public String schedulerName;
    public DateTime notificationFrom;
    public DateTime notificationTo;
    public DateTime scheduleFrom;
    public DateTime scheduleTo;
}

public class PeriodPayload {
    public DateTime start;
    public DateTime finish;
}

使用MapSTRt，我创建了一个映射器，将Xml附表映射到schdulePayload。由于“业务”“逻辑”，我需要将通知周期和计划周期约束为讲座的start和end字段值。这是我使用另一个类得出的结论：

@Mapper(imports = { NotificationPeriodHelper.class })
public interface ISchedulePayloadMapper
{
    @Mappings({
        @Mapping(target = "name", source = "scheduleName"),
        @Mapping(target = "scheduler", source = "schedulerName"),
        @Mapping(target = "notificationPeriod", expression = "java(NotificationPeriodHelper.getConstrainedPeriod(xmlSchedule, notificationFrom, notificationTo))"),
        @Mapping(target = "schedulePeriod", expression = "java(NotificationPeriodHelper.getConstrainedPeriod(xmlSchedule, scheduleFrom, scheduleTo))")
    })
    SchedulePayload map(XmlSchedule xmlSchedule, Lecture lecture);

}

有没有其他方法可以实现这一点（即另一种映射器、装饰器等）？如何将多个值（xml附表、讲座）传递给映射器？

Answer 1

您可以创建一个AfterMapping方法来手动填充这些零件：

@Mapper
public abstract class SchedulePayloadMapper
{
    @Mappings({
        @Mapping(target = "name", source = "scheduleName"),
        @Mapping(target = "scheduler", source = "schedulerName"),
        @Mapping(target = "notificationPeriod", expression = "java(NotificationPeriodHelper.getConstrainedPeriod(xmlSchedule, notificationFrom, notificationTo))"),
        @Mapping(target = "schedulePeriod", expression = "java(NotificationPeriodHelper.getConstrainedPeriod(xmlSchedule, scheduleFrom, scheduleTo))")
    })
    public abstract SchedulePayload map(XmlSchedule xmlSchedule, Lecture lecture);

    @AfterMapping
    protected void addPeriods(@MappingTarget SchedulePayload result, XmlSchedule xmlSchedule, Lecture lecture) {
        result.setNotificationPeriod(..);
        result.setSchedulePeriod(..);
    }
}

或者，您可以将AfterMapping方法放置在映射器中引用的另一个类中（使用=…） 或者您可以使用装饰器（使用MapStruct提供的机制，或者使用依赖注入框架（如果使用的话））。