java 使用 Mapstruct 将多个源字段映射到相同类型的目标字段
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Map multiple source fields to same type target fields with Mapstruct
提问by giannoug
Consider the following POJOs:
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;
}
Using MapStruct, I created a mapper that maps XmlScheduleto a SchedulePayload. Due to "business" "logic", I need to constrain notificationPeriodand schedulePeriodto a Lecture's startand endfield values. Here is what I've come up to, using another class:
使用 MapStruct，我创建了一个映射XmlSchedule到SchedulePayload. 由于“业务”，“逻辑”，我需要限制notificationPeriod和schedulePeriod到Lecture的start和end字段值。这是我想到的，使用另一个类：
@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);
}
Is there any way this can be achieved in another way (i.e. another mapper, decorators, etc.)? How can I pass multiple values (xmlSchedule, lecture) to a mapper?
有没有办法以另一种方式实现这一点（即另一个映射器、装饰器等）？如何将多个值（xmlSchedule、讲座）传递给映射器？
回答by agudian
What you can do is create an @AfterMappingmethod to populate those parts manually:
您可以做的是创建一种@AfterMapping方法来手动填充这些部分：
@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(..);
}
}
Alternatively, you can place the @AfterMappingmethod in another class that is referenced in @Mapper(uses = ..)or you can use a Decorator (using the mechanisms MapStruct provides, or of your dependency injection framework if you use one).
或者，您可以将该@AfterMapping方法放置在另一个被引用的类中，@Mapper(uses = ..)或者您可以使用装饰器（使用 MapStruct 提供的机制，或者您的依赖注入框架（如果使用））。
