EJB30ConversionManager


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 
5    * in compliance with the License.
6    * 
7    * You can obtain a copy of the license at 
8    * glassfish/bootstrap/legal/CDDLv1.0.txt or 
9    * https://glassfish.dev.java.net/public/CDDLv1.0.html. 
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 in each file and include the License file at 
15   * glassfish/bootstrap/legal/CDDLv1.0.txt.  If applicable, 
16   * add the following below this CDDL HEADER, with the 
17   * fields enclosed by brackets "[]" replaced with your 
18   * own identifying information: Portions Copyright [yyyy] 
19   * [name of copyright owner]
20   */
21  // Copyright (c) 1998, 2006, Oracle. All rights reserved.  
22  package oracle.toplink.essentials.internal.helper;
23  
24  /**
25   * <p>
26   * <b>Purpose</b>: Extension to the existing conversion manager to support the
27   * EJB 3.0 spec. 
28   * <p>
29   * <b>Responsibilities</b>:
30   * <ul>
31   * <li> Allow a null value default to be read into primitives. With the current
32   * conversion manager, setting a null into a primitive causes and exception. 
33   * This conversion manager was added to avoid that exception and therefore, add 
34   * support for schemas that were built before the object model was mapped 
35   * (using a primitive). Therefore, TopLink will not change the null column value 
36   * in the database through this conversion. The value on the dataabse will only 
37   * be changed if the user actually sets a new primitive value.
38   * <li> Allows users to define their own set of default null values to be used
39   * in the conversion.
40   * </ul>
41   * 
42   * @author Guy Pelletier
43   * @since TopLink 10.1.4 RI
44   */
45  public class EJB30ConversionManager extends ConversionManager {
46      public EJB30ConversionManager() {
47          super();
48      }
49  
50      /**
51       * INTERNAL:
52       */
53      public Object   getDefaultNullValue(Class   theClass) {
54          Object   defaultNullValue = getDefaultNullValues().get(theClass);
55          
56          if (defaultNullValue == null && theClass.isPrimitive()) {
57              return 0;
58          } else {
59              return defaultNullValue;
60          }
61      }
62  }
63
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