javax.persistence.ElementCollection Maven / Gradle / Ivy
// $Id: ElementCollection.java 17752 2009-10-15 01:19:21Z [email protected] $
// EJB3 Specification Copyright 2004-2009 Sun Microsystems, Inc.
package javax.persistence;
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static javax.persistence.FetchType.LAZY;
/**
* Defines a collection of instances of a basic type or embeddable
* class.
* Must be specified if the collection is to be mapped by
* means of a collection table.
*
*
* Example:
*
* @Entity public class Person {
* @Id protected String ssn;
* protected String name;
* ...
* @ElementCollection
* protected Set<String> nickNames = new HashSet();
* ...
* }
*
*
* @since Java Persistence 2.0
*/
@Target( { METHOD, FIELD })
@Retention(RUNTIME)
public @interface ElementCollection {
/**
* (Optional) The basic or embeddable class that is the element
* type of the collection. This element is optional only if the
* collection field or property is defined using Java generics,
* and must be specified otherwise. It defaults to the
* paramterized type of the collection when defined using
* generics.
*/
Class targetClass() default void.class;
/**
* (Optional) Whether the collection should be lazily loaded or must be
* eagerly fetched. The EAGER strategy is a requirement on
* the persistence provider runtime that the collection elements
* must be eagerly fetched. The LAZY strategy is a hint to the
* persistence provider runtime.
*/
FetchType fetch() default LAZY;
}