/*
* 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.
ElementType.
TYPE;
import static java.lang.annotation.
RetentionPolicy.
RUNTIME;
/**
* Groups {@link PrimaryKeyJoinColumn} annotations.
* It is used to map composite foreign keys.
*
* <pre>
* Example: ValuedCustomer subclass
*
* @Entity
* @Table(name="VCUST")
* @DiscriminatorValue("VCUST")
* @PrimaryKeyJoinColumns({
* @PrimaryKeyJoinColumn(name="CUST_ID",
* referencedColumnName="ID"),
* @PrimaryKeyJoinColumn(name="CUST_TYPE",
* referencedColumnName="TYPE")
* })
* public class ValuedCustomer extends Customer { ... }
* </pre>
*
* @since Java Persistence 1.0
*/
@
Target({
TYPE,
METHOD,
FIELD })
@
Retention(
RUNTIME)
public @interface
PrimaryKeyJoinColumns {
/**
* One or more <code>PrimaryKeyJoinColumn</code> annotations.
*/
PrimaryKeyJoinColumn[] value();
/**
* (Optional) The foreign key constraint specification for the join columns. This is used only if table generation
* is in effect. Default is provider defined.
*
* @return The foreign key specification
*/
ForeignKey foreignKey() default @
ForeignKey();
}