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/*******************************************************************************
 * Copyright (c) 2011, 2012 Oracle and/or its affiliates. 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.
 *
 * Contributors:
 *     Oracle - initial API and implementation
 ******************************************************************************/  
package org.eclipse.persistence.nosql.annotations;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

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

/** 
 * Define a structured data type's foreign key field for an object mapped to NoSql data.
 * This is a generic form of the @JoinColumn annotation, which is not specific to relational databases.
 * It can be use to map EIS and NoSQL data.
 * 
 * @see NoSql
 * @author James Sutherland
 * @since EclipseLink 2.4
 */
@Target({METHOD, FIELD})
@Retention(RUNTIME)
public @interface JoinField {
    /**
     * (Optional) The name of the foreign key/id reference field in the source record.
     */
    String name() default "";
    
    /**
     * (Optional) The name of the id field in the target record.
     */
    String referencedFieldName() default "";
}