MapStruct：如何使用mapper映射具有复合键JPA的视图对象？

我有如下目标实体：

public class ApplicationUsage {
    @Id
    private ApplicationUsagePK appUsage;    //Guid  No documentation available.
    private String name;
    .
    .
    public ApplicationUsage(String id, Integer compId) {
       this.appUsage = new ApplicationUsagePK(id, compId); //This is present in ApplicationUsagePK initiated here which acts are composite key
    }

ApplicationUsage aUsage = ApplicationUsageMapper.MAPPER.entityToDao(agreement.getBody());
aUsage.initiateApplicationUsage(agreement.getBody().getId(), compId);

源对象如下所示：

public class ApplicationUsage {

    @SerializedName("id")
    @Expose
    private String id;
    @SerializedName("name")
    @Expose
    private String name;

我需要将源对象的ID映射到ApplicationSage（字符串ID和CompID来自其他变量，它需要映射到ApplicationSage（..，整数CompID）

在上述类或映射器中需要进行哪些更改才能实现相同的效果

以下是当前的映射程序：

@Mapper
public interface ApplicationUsageMapper {
    ApplicationUsageMapper MAPPER = Mappers.getMapper( ApplicationUsageMapper.class );

    ApplicationUsage entityToDao(com.inte.meow.vo.computer.ApplicationUsage source);
}

坏方法：

我使用了一种不好的方法来解决这个问题，您可以理解以下内容：

public class ApplicationUsage {
    @Id
    private ApplicationUsagePK appUsage;    //Guid  No documentation available.
    private String name;
    .
    .
    public ApplicationUsage(String id, Integer compId) {
       this.appUsage = new ApplicationUsagePK(id, compId); //This is present in ApplicationUsagePK initiated here which acts are composite key
    }

ApplicationUsage aUsage = ApplicationUsageMapper.MAPPER.entityToDao(agreement.getBody());
aUsage.initiateApplicationUsage(agreement.getBody().getId(), compId);

---

您可以使用

@Context

注释来完成

@Mapper
public interface ApplicationUsageMapper {
    ApplicationUsageMapper MAPPER = Mappers.getMapper( ApplicationUsageMapper.class );

    @Mapping(target = "appUsage", source = "source", qualifiedByName = "getAppUsage")
    ApplicationUsage entityToDao(com.inte.meow.vo.computer.ApplicationUsage source, @Context Integer compId);

    @Named("getAppUsage")
    default ApplicationUsagePK toAppUsage(com.inte.meow.vo.computer.ApplicationUsage source, @Context Integer compId) {
        return new ApplicationUsagePK (source.getId(), compId));
    }
}