javax.persistence.ElementCollection Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of hibernate-jpa-2.1-api Show documentation

Clean-room definition of JPA APIs intended for use in developing Hibernate JPA implementation. See README.md for details

There is a newer version: 1.0.2.Final

Show newest version

/*
 * Copyright (c) 2008, 2009, 2011 Oracle, Inc. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
 * which accompanies this distribution.  The Eclipse Public License is available
 * at http://www.eclipse.org/legal/epl-v10.html and the Eclipse Distribution License
 * is available at http://www.eclipse.org/org/documents/edl-v10.php.
 */
package javax.persistence;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
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;
}