JDBCCMP2xAutoUpdatedFieldBridge


1   /*
2   * JBoss, Home of Professional Open Source
3   * Copyright 2005, JBoss Inc., and individual contributors as indicated
4   * by the @authors tag. See the copyright.txt in the distribution for a
5   * full listing of individual contributors.
6   *
7   * This is free software; you can redistribute it and/or modify it
8   * under the terms of the GNU Lesser General Public License as
9   * published by the Free Software Foundation; either version 2.1 of
10  * the License, or (at your option) any later version.
11  *
12  * This software is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this software; if not, write to the Free
19  * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20  * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21  */
22  package org.jboss.ejb.plugins.cmp.jdbc.bridge;
23  
24  
25  import org.jboss.deployment.DeploymentException;
26  import org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager;
27  import org.jboss.ejb.plugins.cmp.jdbc.metadata.JDBCCMPFieldMetaData;
28  import org.jboss.ejb.EntityEnterpriseContext;
29  
30  import java.sql.PreparedStatement  ;
31  
32  /**
33   * The base class for all automatically updated fields such as audit and version.
34   *
35   * @author <a HREF="mailto:alex@jboss.org">Alex Loubyansky</a>
36   * @version $Revision: 37459 $
37   */
38  public abstract class JDBCCMP2xAutoUpdatedFieldBridge extends JDBCCMP2xFieldBridge
39  {
40     // Constructors
41  
42     public JDBCCMP2xAutoUpdatedFieldBridge(JDBCStoreManager manager,
43                                            JDBCCMPFieldMetaData metadata)
44        throws DeploymentException
45     {
46        super(manager, metadata);
47        defaultFlags |= JDBCEntityBridge.ADD_TO_SET_ON_UPDATE;
48     }
49  
50     public JDBCCMP2xAutoUpdatedFieldBridge(JDBCCMP2xFieldBridge cmpField)
51        throws DeploymentException
52     {
53        super(
54           (JDBCStoreManager) cmpField.getManager(),
55           cmpField.getFieldName(),
56           cmpField.getFieldType(),
57           cmpField.getJDBCType(),
58           cmpField.isReadOnly(),               // should always be false?
59           cmpField.getReadTimeOut(),
60           cmpField.getPrimaryKeyClass(),
61           cmpField.getPrimaryKeyField(),
62           cmpField,
63           null,                                // it should not be a foreign key
64           cmpField.getColumnName()
65        );
66        defaultFlags |= JDBCEntityBridge.ADD_TO_SET_ON_UPDATE; // it should be redundant
67        cmpField.addDefaultFlag(JDBCEntityBridge.ADD_TO_SET_ON_UPDATE);
68     }
69  
70     public void initInstance(EntityEnterpriseContext ctx)
71     {
72        setFirstVersion(ctx);
73     }
74  
75     public int setInstanceParameters(PreparedStatement   ps,
76                                      int parameterIndex,
77                                      EntityEnterpriseContext ctx)
78     {
79        Object   value;
80        if(ctx.isValid())
81        {
82           // update
83           // generate new value unless it is already provided by the user
84           value = isDirty(ctx) ? getInstanceValue(ctx) : updateVersion(ctx);
85        }
86        else
87        {
88           // create
89           value = getInstanceValue(ctx);
90        }
91        return setArgumentParameters(ps, parameterIndex, value);
92     }
93  
94     public abstract void setFirstVersion(EntityEnterpriseContext ctx);
95     public abstract Object   updateVersion(EntityEnterpriseContext ctx);
96  }
97
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags