[spring 21편] mapstruct 활용 2번째 (expression 사용)

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[spring 21편] mapstruct 활용 2번째 (expression 사용)

mapstruct expression 활용

• expression 을 통해 source list --> target list 으로 convert 하는 예제를 정리했습니다.

Source

	// ItemInfoMapper.java
	@Mapper(
	componentModel = "spring",
	injectionStrategy = InjectionStrategy.CONSTRUCTOR,
	unmappedTargetPolicy = ReportingPolicy.ERROR
	)
	public interface ItemInfoMapper {
	ItemInfoMapper INSTANCE = Mappers.getMapper(ItemInfoMapper.class);
	@Mapping(source = "id", target = "itemId")
	@Mapping(expression = "java(Item.resolveDescList(item))", target = "descList")
	ItemInfo.Base of(Item item);
	}
	// Item.java
	@Data
	@Entity
	@Builder
	@AllArgsConstructor
	@NoArgsConstructor
	public class Item {
	@Id
	private String id;
	@Column
	private String itemName;
	private List<ItemDescription> descriptionList;
	public static List<ItemInfo.Sub> resolveDescList(final Item item) {
	return item.getDescriptionList().stream().map(desc ->
	ItemInfo.Sub.builder()
	.desc1(desc.getDesc1())
	.desc2(desc.getDesc2())
	.desc3(desc.getDesc3())
	.build()
	).collect(Collectors.toList());
	}
	;
	@Data
	@AllArgsConstructor
	@Builder
	public static class ItemDescription {
	private String desc1;
	private String desc2;
	private String desc3;
	}
	}
	// ItemInfo.java
	public class ItemInfo {
	@Data
	@Builder
	@AllArgsConstructor
	@NoArgsConstructor
	public static class Base {
	private String itemId;
	private String itemName;
	List<Sub> descList;
	}
	@Data
	@SuperBuilder
	@EqualsAndHashCode(callSuper = true)
	public static class Sub extends SuperSub {
	private String etc1;
	}
	@NoArgsConstructor
	@AllArgsConstructor
	@Data
	@SuperBuilder
	public static class SuperSub {
	private String desc1;
	private String desc2;
	private String desc3;
	}
	}
	// ItemInfoMapperTest.java
	public class ItemInfoMapperTest {
	@Test
	void testItemInfoMapperTest() {
	final var item = Item.builder()
	.id("10")
	.itemName("testItem")
	.descriptionList(List.of(
	Item.ItemDescription.builder()
	.desc1("desc1")
	.desc2("desc2")
	.desc3("desc3")
	.build(),
	Item.ItemDescription.builder()
	.desc1("desc11")
	.desc2("desc22")
	.desc3("desc33")
	.build()
	))
	.build();
	final ItemInfo.Base result = ItemInfoMapper.INSTANCE.of(item);
	final ItemInfo.Base expected = getExpected();
	Assertions.assertEquals(result, expected);
	}
	private ItemInfo.Base getExpected() {
	final var expected = ItemInfo.Base.builder()
	.itemId("10")
	.itemName("testItem")
	.descList(List.of(
	ItemInfo.Sub.builder()
	.desc1("desc1")
	.desc2("desc2")
	.desc3("desc3")
	.build(),
	ItemInfo.Sub.builder()
	.desc1("desc11")
	.desc2("desc22")
	.desc3("desc33")
	.build()))
	.build();
	return expected;
	}
	}

view raw MapstructUsingExpression.java hosted with ❤ by GitHub