CODEWITHSUNDEEP
javahibernatejpalombok
Giovanni Paolo Gibilisco
Giovanni Paolo Gibilisco

Reputation: 81

How to expose fields of and @EmbeddedId

I have an @Entity with three fields A, B, C out of which A and B act as composite primary key. I created an @EmbeddedId class holding A and B. To ease the burden of defining getters and setters i used lombok @Data annotation. 

@Entity
@Data
public class MyClass {
    @EmbeddedId
    private PrimaryKey id;
}

@Embeddable
@Data
public class PrimareyKey implements Serializable {
    private String A;
    private String B;
}

I would not like to expose that A and B are the primary key and access A and access all fields in the same way. 

//Exposes primary key
myObject.getid().getA();
myObject.getid().getB();
myObject.getC();

//Hides primary key
myObject.getA();
myObject.getB();
myObject.getC();

Currently one could use @IdClass tagging each filed as @Id as suggested in this answer but if I still need to use @EmbeddedId (or any @Embedded actually) the only way (I know) to achieve this is to write ad hoc getters and setters bypassing the id variable such as

@Entity
@Data
public class MyClass {
    @EmbeddedId
    private PrimaryKey id;

    public String A getA(){
        return id.getA()
    }

    public String A setA(String a){
        id.setA(a);
    }
    //same for B and any other fiels in PrimaryKey

}

This looks like a lot of boilerplate code to write and maintain.

Is there an annotation to expose @EmbeddedId getters and setters?

Upvotes: 4

Views: 3528

Answers (2)

KayV
KayV

Reputation: 13855

You can use the AccessLevel with @Getter and @Setter as follows:

@Getter(AccessLevel.NONE)
@Setter(AccessLevel.NONE)
private PrimaryKey id;

When using @Data, you have the public access to accessors by default, and using AccessLevel.NONE will overwrite the default behaviour and will not allow to access the accessors.

Upvotes: 1

Luay Abdulraheem
Luay Abdulraheem

Reputation: 761

In MyClass, add Lombok @Delegate annotation to your PrimaryKey. It should look like:

@Entity
@Data
public class MyClass {
    @Delegate
    @EmbeddedId
    private PrimaryKey id;
}

Then you can set/get PrimaryKey fields directly from MyClass. Here is a link for you to read more about it.

Upvotes: 3

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