【MapStruct】Object Factory を使う

Object Factoryを使って、マッピングするオブジェクトを生成することができる。

環境

• MapStruct : 1.2.0.Final
• Java : 9
• JUnit : 4.12
• AssertJ : 3.9.1

---

Object Factoryの作成

public class StudentFactory {
    public Student createStudent() {
        Student student = new Student();
        student.setAddress("STUDENT_FACTORY");
        return student;
    }
}

Mapperの作成

@Mapper にFactoryクラスを指定する。

@Mapper(uses = StudentFactory.class)
public interface StudentMapper {

    StudentMapper MAPPER = Mappers.getMapper(StudentMapper.class);

    @Mapping(target = "address", ignore = true)
    Student toStudent(StudentEntity entity);
}

生成されたコード

/*
@Generated(
    value = "org.mapstruct.ap.MappingProcessor",
    date = "2018-03-18T14:54:28+0900",
    comments = "version: 1.2.0.Final, compiler: javac, environment: Java 9.0.1 (Oracle Corporation)"
)
*/
public class StudentMapperImpl implements StudentMapper {

    private final StudentFactory studentFactory = new StudentFactory();

    @Override
    public Student toStudent(StudentEntity entity) {
        if ( entity == null ) {
            return null;
        }

        Student student = studentFactory.createStudent();

        student.setName( entity.getName() );
        student.setAge( entity.getAge() );

        return student;
    }
}

テストコード

@Test
public void test() {
    StudentEntity entity = new StudentEntity();
    Student student = StudentMapper.MAPPER.toStudent(entity);
    assertThat(student.getAddress()).isEqualTo("STUDENT_FACTORY");
}