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Java > Open Source Codes > org > jboss > ejb > plugins > cmp > jdbc > bridge > JDBCKeyGenVersionFieldBridge


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 import org.jboss.ejb.EntityEnterpriseContext;
25 import org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager;
26 import org.jboss.ejb.plugins.cmp.jdbc.metadata.JDBCCMPFieldMetaData;
27 import org.jboss.ejb.plugins.keygenerator.KeyGeneratorFactory;
28 import org.jboss.ejb.plugins.keygenerator.KeyGenerator;
29 import org.jboss.deployment.DeploymentException;
30
31 import javax.naming.InitialContext JavaDoc;
32 import javax.naming.NamingException JavaDoc;
33
34 /**
35  *
36  * @author <a HREF="mailto:alex@jboss.org">Alexey Loubyansky</a>
37  */
38 public class JDBCKeyGenVersionFieldBridge extends JDBCCMP2xVersionFieldBridge
39 {
40    private final KeyGenerator keyGenerator;
41
42    public JDBCKeyGenVersionFieldBridge(JDBCStoreManager manager,
43                                        JDBCCMPFieldMetaData metadata,
44                                        String JavaDoc keygenFactoryName)
45       throws DeploymentException
46    {
47       super(manager, metadata);
48       keyGenerator = initKeyGenerator(keygenFactoryName);
49    }
50
51    public JDBCKeyGenVersionFieldBridge(JDBCCMP2xFieldBridge cmpField, String JavaDoc keygenFactoryName)
52       throws DeploymentException
53    {
54       super(cmpField);
55       keyGenerator = initKeyGenerator(keygenFactoryName);
56    }
57
58    private KeyGenerator initKeyGenerator(String JavaDoc keygenFactoryName) throws DeploymentException
59    {
60       try
61       {
62          InitialContext JavaDoc ctx = new InitialContext JavaDoc();
63          KeyGeneratorFactory keygenFactory = (KeyGeneratorFactory)ctx.lookup(keygenFactoryName);
64          return keygenFactory.getKeyGenerator();
65       }
66       catch(NamingException JavaDoc e)
67       {
68          throw new DeploymentException("Could not lookup key generator factory: "
69             + keygenFactoryName, e);
70       }
71       catch(Exception JavaDoc e)
72       {
73          throw new DeploymentException("Could not create KeyGenerator instance.", e);
74       }
75    }
76
77    public void setFirstVersion(EntityEnterpriseContext ctx)
78    {
79       Object JavaDoc version = keyGenerator.generateKey();
80       setInstanceValue(ctx, version);
81    }
82
83    public Object JavaDoc updateVersion(EntityEnterpriseContext ctx)
84    {
85       Object JavaDoc next = keyGenerator.generateKey();
86       setInstanceValue(ctx, next);
87       return next;
88    }
89 }
90
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