Java 使用SuperBuilder使用Lombok扩展父类

我有一个DTO使用Lombok功能，如下图所示。但现在由于一些要求，我不得不将我的DTO扩展到如下所示的父类。我如何对DTO进行最小的更改以支持该功能。我尝试使用@SuperBuilder注释，但失败了

DTO之前：

@Getter
@ToString
@EqualsAndHashCode
@Builder(toBuilder = true)
@AllArgsConstructor(access = AccessLevel.PRIVATE)
public class RequestMessage {
private final String name;
 }

需要扩展的父类

   @Data
   @SuperBuilder(toBuilder = true)
   @JsonDeserialize(builder = MyDTO.Builder.class)
   public abstract class MyDTO implements Serializable {
   @JsonIgnore private final ObjectMapper objectMapper = new ObjectMapper();
   protected String myAccountId;

   protected MyDTO() {}

   public static int hashCode(Object... objects) {
     return Arrays.deepHashCode(objects);
   }

   public static boolean equal(Object o1, Object o2) {
    // implementation of equals method
   }

   public abstract String emitSerializedPayload() throws JsonProcessingException;

   @JsonPOJOBuilder(withPrefix = "")
   protected abstract static class Builder<T extends MyDTO, B extends Builder<T, B>> {
   protected T dtoInstance;
   protected B builderInstance;

   public Builder() {
  dtoInstance = createDtoInstance();
  builderInstance = returnBuilderInstance();
}

protected abstract T createDtoInstance();

protected abstract B returnBuilderInstance();

public B myAccountId(String accountId) {
  dtoInstance.myAccountId = accountId;
  return builderInstance;
}

public T build() {
  return dtoInstance;
}
}
}

我的尝试如下所示：

 @Getter
 @ToString
 @EqualsAndHashCode(callSuper = true)
 @SuperBuilder(toBuilder = true)
 @AllArgsConstructor(access = AccessLevel.PRIVATE)
 public class RequestMessage extends MyDTO {
 private final String name;

 @Override
 public String emitSerializedPayload() throws JsonProcessingException {
// TODO Auto-generated method stub
return null;
}
} 
 

---

您不应该将lombok

@Builder

与静态内部构建器类混合使用。如果可以摆脱

Builder

类，那么下一个代码应该可以工作

请求消息：

@Getter
@ToString
@EqualsAndHashCode(callSuper = true)
@SuperBuilder(toBuilder = true)
@AllArgsConstructor(access = AccessLevel.PRIVATE)
public class RequestMessage extends MyDTO {
    private final String name;

    @Override
    public String emitSerializedPayload() throws JsonProcessingException {
    return null;
    }
    public RequestMessage(String myAccountId, String name) {
        super(myAccountId);
        this.name = name;
}
}

@Data
@SuperBuilder(toBuilder = true)
public abstract class MyDTO implements Serializable {
    @JsonIgnore private final ObjectMapper objectMapper = new ObjectMapper();
    protected String myAccountId;

    protected MyDTO() {}

    public MyDTO(String myAccountId) {
       this.myAccountId = myAccountId;
    }

    public static int hashCode(Object... objects) {
        return Arrays.deepHashCode(objects);
    }

    public static boolean equal(Object o1, Object o2) {
        // implementation of equals method
        return false;
    }
    public abstract String emitSerializedPayload() throws JsonProcessingException;
}

@Test
void name() {
    String myName = "myName";
    String myAccountId = "myAccountId";
    var request = RequestMessage.builder().name(myName).myAccountId(myAccountId).build();
    System.out.println("request = " + request);
    RequestMessage requestMessage = new RequestMessage(myAccountId, myName);
}
    

MyDTO：

@Getter
@ToString
@EqualsAndHashCode(callSuper = true)
@SuperBuilder(toBuilder = true)
@AllArgsConstructor(access = AccessLevel.PRIVATE)
public class RequestMessage extends MyDTO {
    private final String name;

    @Override
    public String emitSerializedPayload() throws JsonProcessingException {
    return null;
    }
    public RequestMessage(String myAccountId, String name) {
        super(myAccountId);
        this.name = name;
}
}

@Data
@SuperBuilder(toBuilder = true)
public abstract class MyDTO implements Serializable {
    @JsonIgnore private final ObjectMapper objectMapper = new ObjectMapper();
    protected String myAccountId;

    protected MyDTO() {}

    public MyDTO(String myAccountId) {
       this.myAccountId = myAccountId;
    }

    public static int hashCode(Object... objects) {
        return Arrays.deepHashCode(objects);
    }

    public static boolean equal(Object o1, Object o2) {
        // implementation of equals method
        return false;
    }
    public abstract String emitSerializedPayload() throws JsonProcessingException;
}

@Test
void name() {
    String myName = "myName";
    String myAccountId = "myAccountId";
    var request = RequestMessage.builder().name(myName).myAccountId(myAccountId).build();
    System.out.println("request = " + request);
    RequestMessage requestMessage = new RequestMessage(myAccountId, myName);
}
    

测试：

@Getter
@ToString
@EqualsAndHashCode(callSuper = true)
@SuperBuilder(toBuilder = true)
@AllArgsConstructor(access = AccessLevel.PRIVATE)
public class RequestMessage extends MyDTO {
    private final String name;

    @Override
    public String emitSerializedPayload() throws JsonProcessingException {
    return null;
    }
    public RequestMessage(String myAccountId, String name) {
        super(myAccountId);
        this.name = name;
}
}

@Data
@SuperBuilder(toBuilder = true)
public abstract class MyDTO implements Serializable {
    @JsonIgnore private final ObjectMapper objectMapper = new ObjectMapper();
    protected String myAccountId;

    protected MyDTO() {}

    public MyDTO(String myAccountId) {
       this.myAccountId = myAccountId;
    }

    public static int hashCode(Object... objects) {
        return Arrays.deepHashCode(objects);
    }

    public static boolean equal(Object o1, Object o2) {
        // implementation of equals method
        return false;
    }
    public abstract String emitSerializedPayload() throws JsonProcessingException;
}

@Test
void name() {
    String myName = "myName";
    String myAccountId = "myAccountId";
    var request = RequestMessage.builder().name(myName).myAccountId(myAccountId).build();
    System.out.println("request = " + request);
    RequestMessage requestMessage = new RequestMessage(myAccountId, myName);
}
    

---

您不应该将lombok

@Builder

与静态内部构建器类混合使用。如果可以摆脱

Builder

类，那么下一个代码应该可以工作

请求消息：

@Getter
@ToString
@EqualsAndHashCode(callSuper = true)
@SuperBuilder(toBuilder = true)
@AllArgsConstructor(access = AccessLevel.PRIVATE)
public class RequestMessage extends MyDTO {
    private final String name;

    @Override
    public String emitSerializedPayload() throws JsonProcessingException {
    return null;
    }
    public RequestMessage(String myAccountId, String name) {
        super(myAccountId);
        this.name = name;
}
}

@Data
@SuperBuilder(toBuilder = true)
public abstract class MyDTO implements Serializable {
    @JsonIgnore private final ObjectMapper objectMapper = new ObjectMapper();
    protected String myAccountId;

    protected MyDTO() {}

    public MyDTO(String myAccountId) {
       this.myAccountId = myAccountId;
    }

    public static int hashCode(Object... objects) {
        return Arrays.deepHashCode(objects);
    }

    public static boolean equal(Object o1, Object o2) {
        // implementation of equals method
        return false;
    }
    public abstract String emitSerializedPayload() throws JsonProcessingException;
}

@Test
void name() {
    String myName = "myName";
    String myAccountId = "myAccountId";
    var request = RequestMessage.builder().name(myName).myAccountId(myAccountId).build();
    System.out.println("request = " + request);
    RequestMessage requestMessage = new RequestMessage(myAccountId, myName);
}
    

MyDTO：

@Getter
@ToString
@EqualsAndHashCode(callSuper = true)
@SuperBuilder(toBuilder = true)
@AllArgsConstructor(access = AccessLevel.PRIVATE)
public class RequestMessage extends MyDTO {
    private final String name;

    @Override
    public String emitSerializedPayload() throws JsonProcessingException {
    return null;
    }
    public RequestMessage(String myAccountId, String name) {
        super(myAccountId);
        this.name = name;
}
}

@Data
@SuperBuilder(toBuilder = true)
public abstract class MyDTO implements Serializable {
    @JsonIgnore private final ObjectMapper objectMapper = new ObjectMapper();
    protected String myAccountId;

    protected MyDTO() {}

    public MyDTO(String myAccountId) {
       this.myAccountId = myAccountId;
    }

    public static int hashCode(Object... objects) {
        return Arrays.deepHashCode(objects);
    }

    public static boolean equal(Object o1, Object o2) {
        // implementation of equals method
        return false;
    }
    public abstract String emitSerializedPayload() throws JsonProcessingException;
}

@Test
void name() {
    String myName = "myName";
    String myAccountId = "myAccountId";
    var request = RequestMessage.builder().name(myName).myAccountId(myAccountId).build();
    System.out.println("request = " + request);
    RequestMessage requestMessage = new RequestMessage(myAccountId, myName);
}
    

测试：

@Getter
@ToString
@EqualsAndHashCode(callSuper = true)
@SuperBuilder(toBuilder = true)
@AllArgsConstructor(access = AccessLevel.PRIVATE)
public class RequestMessage extends MyDTO {
    private final String name;

    @Override
    public String emitSerializedPayload() throws JsonProcessingException {
    return null;
    }
    public RequestMessage(String myAccountId, String name) {
        super(myAccountId);
        this.name = name;
}
}

@Data
@SuperBuilder(toBuilder = true)
public abstract class MyDTO implements Serializable {
    @JsonIgnore private final ObjectMapper objectMapper = new ObjectMapper();
    protected String myAccountId;

    protected MyDTO() {}

    public MyDTO(String myAccountId) {
       this.myAccountId = myAccountId;
    }

    public static int hashCode(Object... objects) {
        return Arrays.deepHashCode(objects);
    }

    public static boolean equal(Object o1, Object o2) {
        // implementation of equals method
        return false;
    }
    public abstract String emitSerializedPayload() throws JsonProcessingException;
}

@Test
void name() {
    String myName = "myName";
    String myAccountId = "myAccountId";
    var request = RequestMessage.builder().name(myName).myAccountId(myAccountId).build();
    System.out.println("request = " + request);
    RequestMessage requestMessage = new RequestMessage(myAccountId, myName);
}
    

---

您应该尝试将

@Builder

或

@SuperBuilder

注释添加到父类中，我也这样做了@SuperBuilder（toBuilder=true），但它不起作用，我更新了父类。您不应该将lombok

@Builder

与静态内部类生成器混合使用。在您的情况下，最简单的方法是重构父类，并用

@SuperBuilder（toBuilder=true）

注释替换

Builder

类。它给出的错误是，RequestMessage.Builder无法解析为类型。请在此代码行中的RequestMessage.Builder（）.name（myName）.myAccountId（myAcId）.build（）类型中创建类生成器；您应该使用

.builder（）

而不是

.builder（）

您应该尝试将

@builder

或

@SuperBuilder

注释添加到父类中，我也这样做了@SuperBuilder（toBuilder=true），但它不起作用，我更新了父类。您不应该将lombok

@Builder

与静态内部类生成器混合使用。在您的情况下，最简单的方法是重构父类，并用

@SuperBuilder（toBuilder=true）

注释替换

Builder

类。它给出的错误是，RequestMessage.Builder无法解析为类型。请在此代码行中的RequestMessage.Builder（）.name（myName）.myAccountId（myAcId）.build（）类型中创建类生成器；您应该使用

.builder（）

而不是

.builder（）

好的，我正在尝试用new实例化它，即new RequestMessage.builder（）.name（myName）.myAccountId（myAccountId）.build（）我不能使用new吗？equals和hashcode（callSuper=true）之间应该有什么区别和以前一样，我只是使用EqualsAndHashCode。所以我可以继续使用相同的或应该执行callSuper=true。

new

关键字与生成器模式无关。如果您想使用它，您需要在父类中声明一个构造函数，然后在子构造函数中使用它（调用

（super（）

）。根据文档：lombok.equalsAndHashCode.callSuper=[call | skip | warn]（默认值：warn）如果设置为call，lombok将生成对hashCode的超类实现的调用，如果您的类扩展了某些内容，则将生成equals。如果设置为skip，则不会生成此类调用。默认行为类似于skip，并带有一个附加警告。好的，我正试图用new（即new Req）实例化它uestMessage.builder（）.name（myName）.myAccountId（myAccountId）.build（）我不能使用new吗？EqualsAndHashCode（callSuper=true）之间应该有什么区别还有EqualsAndHashCode。和以前一样，我只是使用EqualsAndHashCode。我可以继续使用相同的还是应该使用callSuper=true。

new

关键字与生成器模式无关。如果要使用它，需要在父类中声明一个构造函数，然后使用它（调用

（super（）

）在子构造函数中。根据docs:lombok.equalsAndHashCode.callSuper=[call | skip | warn]（默认值：warn）如果设置为call，lombok将生成对hashCode的超类实现的调用，如果您的类扩展了某些内容，则会生成相等的调用。如果设置为skip，则不会生成此类调用。默认行为类似于skip，并带有附加警告。