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Hibernate definition of the Java Persistence 2.0 (JSR 317) API.

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// $Id: IdClass.java 17752 2009-10-15 01:19:21Z [email protected] $
// EJB3 Specification Copyright 2004-2009 Sun Microsystems, Inc.
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();
}