fine-third/fine-jpa/src/com/fr/third/javax/persistence/JoinColumns.java

/*
 * 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 com.fr.third.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;

/**
 * Defines mapping for composite foreign keys. This annotation
 * groups <code>JoinColumn</code> annotations for the same relationship.
 *
 * <p> When the <code>JoinColumns</code> annotation is used,
 * both the <code>name</code> and the <code>referencedColumnName</code> elements
 * must be specified in each such <code>JoinColumn</code> annotation.
 *
 * <pre>
 *
 *    Example:
 *    &#064;ManyToOne
 *    &#064;JoinColumns({
 *        &#064;JoinColumn(name="ADDR_ID", referencedColumnName="ID"),
 *        &#064;JoinColumn(name="ADDR_ZIP", referencedColumnName="ZIP")
 *    })
 *    public Address getAddress() { return address; }
 * </pre>
 *
 * @see JoinColumn
 *
 * @since Java Persistence 1.0
 */
@Target({METHOD, FIELD})
@Retention(RUNTIME)
public @interface JoinColumns {

    /**
     * The join columns that map the relationship.
     */
    JoinColumn[] 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();
}