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.comparator;
21  
22  
23  import java.util.Comparator;
24  
25  
26  /**
27   * Compares chars
28   * 
29   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
30   */
31  public class CharComparator implements Comparator<Character>
32  {
33      /**
34       * Compare two chars.
35       * 
36       * @param char1 First char
37       * @param char2 Second char
38       * @return 1 if char1 > char2, 0 if char1 == char2, -1 if char1 < char2
39       */
40      public int compare( Character char1, Character char2 )
41      {
42          if ( char1 == char2 )
43          {
44              return 0;
45          }
46  
47          if ( char1 == null )
48          {
49              if ( char2 == null )
50              {
51                  return 0;
52              }
53              else
54              {
55                  return -1;
56              }
57          }
58          else
59          {
60              if ( char2 == null )
61              {
62                  return 1;
63              }
64              else
65              {
66                  if ( char1 < char2 )
67                  {
68                      return -1;
69                  }
70                  else if ( char1 > char2 )
71                  {
72                      return 1;
73                  }
74                  else
75                  {
76                      return 0;
77                  }
78              }
79          }
80      }
81  }