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1   /*
2    * Copyright 2004 Charles Blaxland
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package mnemosyne.core;
17  
18  import org.apache.commons.logging.Log;
19  import org.apache.commons.logging.LogFactory;
20  
21  /***
22   * @version $Id: VersionManager.java,v 1.1.1.1 2004/08/07 06:41:16 charlesblaxland Exp $
23   */
24  public class VersionManager
25  {
26      private static final Log log = LogFactory.getLog(VersionManager.class);
27  
28      private Version latestVersion;
29  
30      public VersionManager()
31      {
32          this.latestVersion = new LongVersion(0);
33      }
34  
35      public VersionManager(Version initialVersion)
36      {
37          this.latestVersion = initialVersion;
38      }
39  
40      public Version getLatestVersion()
41      {
42          return latestVersion;
43      }
44  
45      public void setLatestVersion(Version latestVersion)
46      {
47          this.latestVersion = latestVersion;
48      }
49  
50      public Version getNextVersion()
51      {
52          return latestVersion.getNext();
53      }
54  
55      public void advanceThisThreadsVersion()
56      {
57          log.info("Advancing version to " + latestVersion);
58          PersistentContext.get(this).setVersion(latestVersion);
59      }
60  }