JPA is a library for cloning a persistent entity including the entire tree relationships thereof. The jpa-entitycloner not only copies the attributes of an object to another. This library looks at the whole context of relationships based on jpa annotations as @OneToOne, @OneToMany, @ManyToMany, @ManyToOne, @Embeddable, @Id, @Entity, and so on applying copies of the fields or using the original value according to the context.
MyEntityClass entity = entityDAO.find(id);
EntityCloner<MyEntityClass> cloner = new EntityCloner<MyEntityClass>(entity);
MyEntityClass clone = cloner.generateClone();The library provides two annotations to customize clone:
- @ForceClone: Fields with this annotation must be cloned even if the clone is not required.
- @IgnoreClone: Fields with this note will not be cloned even if the clone is required.
@Entity
public class MyEntityClass {
@Id
private Long id;
//Will be cloned
@Column
private String field1;
//Must be cloned necessarily independent of context
@ForceClone
private String field2;
//Will be ignored necessarily independent of context and the original value necessarily always will be setted.
@IgnoreClone
private String field3;
//Will be ignored necessarily independent of context and null will be setted in clone object
@IgnoreClone(setNull = true)
private String field4;
//Clone entire relationship tree evaluating the context based on the annotations.
//The library will seek @OneToMany, @ManyToOne, @ManyToMany, @OneToOne and @Embeddable annotations.
@OneToMany(mappedBy = "myEntityClass")
private Set<OtherEntity> list;
//....
}- Author: Victor Lindberg
- Email: [email protected]