java - 如何消除 2 个不同类的 util 类上的重复项

Question

我声明了两个具有相同成员但由于某些原因分开的类。我实现了一个 util 类，将这 2 个类转换为 1 个相同的类，如下所示。

@Data
@Builder
public class VO1 {
  private int id;
  private String value1;
  private String value2;
  ...
  private String value20;
}

@Data
@Builder
public class VO2 {
  private int id;
  private String value1;
  private String value2;
  ...
  private String value20;
}

@Data
@Builder
public class DomainEntity {
  private int id;
  private String value1;
  private String value2;
  ...
  private String value15;
}

public class Converter {
  public static DomainEntity fromVO1(VO1 vo1) {
    return DomainEntity.builder.id(vo1.getId())
             .value1(vo1.getValue1())
             .value2(vo1.getValue2())
             ...
             .value15(vo1.getValue15())
             .build();
  }

  public static DomainEntity fromVO2(VO2 vo2) {
    return DomainEntity.builder.id(vo2.getId())
             .value1(vo2.getValue1())
             .value2(vo2.getValue2())
             ...
             .value15(vo2.getValue15())
             .build();
  }
}

现在我在“转换器”中有重复的代码，我想消除它们。当然我知道我可以使用继承来删除它。不过我也想使用“Lombok”，因为这些类有很多属性。并且使用继承使得“Lombok”的使用变得更加困惑。有谁知道解决这种情况的优雅方法？

谢谢。

Answer 1

我使用继承尝试了你的示例，我不觉得代码变得更困惑，我错过了什么吗？

对于继承，您可以使用实验性的 @SuperBuilder

       package lombok;

        @Getter
        @Setter
        @SuperBuilder
        public class BaseVO {


            private String s1;
            private String s2;
            private String s3;
            private String s4;
            private String s5;
            private String s6;
            private String s7;
            private String s8;
            private String s9;

        }


        package lombok;

        @Getter
        @Setter
        @SuperBuilder
        public class VO1 extends BaseVO{

            private String vo1Specific;
        }


        package lombok;

        @Getter
        @Setter
        @SuperBuilder
        public class VO2 extends BaseVO {

            private String vo2Specific;
        }

        package lombok;

        @Builder
        @ToString
        public class DomainEntity {

            private String s1;
            private String s2;
            private String s3;
            private String s4;
            private String s5;
            private String s6;
            private String s7;
            private String s8;
            private String s9;
            private String specific;

        }


package lombok;

import lombok.DomainEntity.DomainEntityBuilder;

public class Converter {

    public static <T extends BaseVO> DomainEntity fromVO(T basevo) {

        DomainEntityBuilder builder = DomainEntity.builder();
        builder.s1(basevo.getS1()).s2(basevo.getS2()).s3(basevo.getS3());

        if (basevo instanceof VO1) {
            VO1 vo1 = (VO1) basevo;
            builder.specific(vo1.getVo1Specific());

        }

        if (basevo instanceof VO2) {
            VO2 vo1 = (VO2) basevo;
            builder.specific(vo1.getVo2Specific());

        }

        return builder.build();

    }

}

        package lombok;

        public class App {

            public static void main(String[] args) {

            VO1 vo1 = VO1.builder().s1("VO1S1").vo1Specific("VO1 specific property").build();

            VO2 vo2 = VO2.builder().s1("VO2S1").vo2Specific("VO2 specific property").build();

            DomainEntity d1 = Converter.<VO1>fromVO(vo1);
            System.out.println(" d1 " + d1);
            DomainEntity d2 = Converter.<VO2>fromVO(vo2);

            System.out.println(" d2 " + d2);

            }

        }