View Javadoc

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:dev@directory.apache.org">Apache Directory Project</a>
30   */
31  /* no qualifier*/class NameRevisionComparator implements Comparator<NameRevision>
32  {
33      /**
34       * {@inheritDoc}
35       */
36      public int compare( NameRevision rn1, NameRevision rn2 )
37      {
38          if ( rn1 == rn2 )
39          {
40              return 0;
41          }
42  
43          // First compare the name
44          int comp =  rn1.getName().compareTo( rn2.getName() );
45  
46          if ( comp < 0 )
47          {
48              return -1;
49          }
50          else if ( comp > 0 )
51          {
52              return 1;
53          }
54  
55          if ( rn1.getRevision() < rn2.getRevision() )
56          {
57              return -1;
58          }
59          else if ( rn1.getRevision() > rn2.getRevision() )
60          {
61              return 1;
62          }
63  
64          // The name are equal : check the revision
65          if ( rn1.getRevision() < rn2.getRevision() )
66          {
67              return -1;
68          }
69          else if ( rn1.getRevision() > rn2.getRevision() )
70          {
71              return 1;
72          }
73  
74          return 0;
75      }
76  }