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/*
 * Copyright (c) 2008, 2009 Sun Microsystems. 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:
 *     Linda DeMichiel - Java Persistence 2.0 - Version 2.0 (October 1, 2009)
 *     Specification available from http://jcp.org/en/jsr/detail?id=317
 */

// $Id: IdClass.java 20957 2011-06-13 09:58:51Z stliu $

package javax.persistence;

import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

/**
 * Specifies a composite primary key class that is mapped to
 * multiple fields or properties of the entity.
 *
 * 

The names of the fields or properties in the primary key * class and the primary key fields or properties of the entity * must correspond and their types must be the same. * *

 *
 *   Example:
 *
 *   @IdClass(com.acme.EmployeePK.class)
 *   @Entity
 *   public class Employee {
 *      @Id String empName;
 *      @Id Date birthDay;
 *      ...
 *   }
 * 
* * @since Java Persistence 1.0 */ @Target({TYPE}) @Retention(RUNTIME) public @interface IdClass { /** Primary key class */ Class value(); }




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