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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.comparator;
21  
22  
23  import java.util.Comparator;
24  
25  
26  /**
27   * Compares bytes
28   * 
29   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
30   */
31  public class ByteComparator implements Comparator<Byte>
32  {
33      /**
34       * Compare two bytes.
35       * 
36       * @param byte1 First byte
37       * @param byte2 Second byte
38       * @return 1 if byte1 > byte2, 0 if byte1 == byte2, -1 if byte1 < byte2
39       */
40      public int compare( Byte byte1, Byte byte2 )
41      {
42          if ( byte1 == byte2 )
43          {
44              return 0;
45          }
46  
47          if ( byte1 == null )
48          {
49              return -1;
50          }
51  
52          if ( byte2 == null )
53          {
54              return 1;
55          }
56  
57          if ( byte1 < byte2 )
58          {
59              return -1;
60          }
61          else if ( byte1 > byte2 )
62          {
63              return 1;
64          }
65          else
66          {
67              return 0;
68          }
69      }
70  }