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 Longs
28 *
29 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
30 */
31 public class LongComparator implements Comparator<Long>
32 {
33 /** A static instance of a LongComparator */
34 public static final LongComparator INSTANCE = new LongComparator();
35
36 /**
37 * A private constructor of the BooleanArrayComparator class
38 */
39 private LongComparator()
40 {
41 }
42 /**
43 * Compare two longs.
44 *
45 * @param long1 First long
46 * @param long2 Second long
47 * @return 1 if long1 > long2, 0 if long1 == long2, -1 if long1 < long2
48 */
49 public int compare( Long long1, Long long2 )
50 {
51 if ( long1 == long2 )
52 {
53 return 0;
54 }
55
56 if ( long1 == null )
57 {
58 if ( long2 == null )
59 {
60 return 0;
61 }
62 else
63 {
64 return -1;
65 }
66 }
67 else
68 {
69 if ( long2 == null )
70 {
71 return 1;
72 }
73 else
74 {
75 if ( long1 < long2 )
76 {
77 return -1;
78 }
79 else if ( long1 > long2 )
80 {
81 return 1;
82 }
83 else
84 {
85 return 0;
86 }
87 }
88 }
89 }
90 }