IdClass


1   /*
2    * The contents of this file are subject to the terms 
3    * of the Common Development and Distribution License 
4    * (the License).  You may not use this file except in
5    * compliance with the License.
6    * 
7    * You can obtain a copy of the license at 
8    * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9    * glassfish/bootstrap/legal/CDDLv1.0.txt.
10   * See the License for the specific language governing 
11   * permissions and limitations under the License.
12   * 
13   * When distributing Covered Code, include this CDDL 
14   * Header Notice in each file and include the License file 
15   * at glassfish/bootstrap/legal/CDDLv1.0.txt.  
16   * If applicable, add the following below the CDDL Header, 
17   * with the fields enclosed by brackets [] replaced by
18   * you own identifying information: 
19   * "Portions Copyrighted [year] [name of copyright owner]"
20   * 
21   * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22   */
23  package javax.persistence;
24  
25  import java.lang.annotation.Target  ;
26  import java.lang.annotation.Retention  ;
27  import static java.lang.annotation.ElementType.TYPE  ;
28  import static java.lang.annotation.RetentionPolicy.RUNTIME  ;
29  
30  /**
31   * Specifies a composite primary key class that is mapped to 
32   * multiple fields or properties of the entity.  
33   *
34   * <p> The names of the fields or properties in the primary key 
35   * class and the primary key fields or properties of the entity 
36   * must correspond and their types must be the same.
37   *
38   * <pre>
39   *
40   *   Example:
41   *
42   *   &#064;IdClass(com.acme.EmployeePK.class)
43   *   &#064;Entity
44   *   public class Employee {
45   *     &#064;Id String empName;
46   *     &#064;Id Date birthDay;
47   *     ...
48   *   }
49   * </pre>
50   *
51   * @since Java Persistence 1.0
52   */
53  @Target  ({TYPE})
54  @Retention  (RUNTIME)
55  
56  public @interface IdClass {
57  
58      /** Primary key class */
59      Class   value();
60  }
61
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