/*
 * 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.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/**
 * Specifies a composite primary key class that is mapped to
 * multiple fields or properties of the entity.
 * <p>
 * <p> 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.
 * <p>
 * <pre>
 *
 *   Example:
 *
 *   &#064;IdClass(com.acme.EmployeePK.class)
 *   &#064;Entity
 *   public class Employee {
 *      &#064;Id String empName;
 *      &#064;Id Date birthDay;
 *      ...
 *   }
 * </pre>
 *
 * @since Java Persistence 1.0
 */
@Target({TYPE})
@Retention(RUNTIME)

public @interface IdClass {

  Class value();
}