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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License.
18   *
19   */
20  package org.apache.directory.mavibot.btree;
21  
22  
23  import java.util.Comparator;
24  
25  
26  /**
27   * A comparator for the RevisionName class
28   * 
29   * @author <a href="mailto:labs@labs.apache.org">Mavibot labs Project</a>
30   */
31  public class RevisionNameComparator implements Comparator<RevisionName>
32  {
33      /**
34       * {@inheritDoc}
35       */
36      public int compare( RevisionName rn1, RevisionName rn2 )
37      {
38          if ( rn1 == rn2 )
39          {
40              return 0;
41          }
42  
43          // First compare the revisions
44          if ( rn1.getRevision() < rn2.getRevision() )
45          {
46              return -1;
47          }
48          else if ( rn1.getRevision() > rn2.getRevision() )
49          {
50              return 1;
51          }
52  
53          // The revision are equal : check the name
54          return rn1.getName().compareTo( rn2.getName() );
55      }
56  }