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.api.ldap.model.schema.comparators;
21
22
23 import java.util.UUID;
24
25 import org.slf4j.Logger;
26 import org.slf4j.LoggerFactory;
27
28
29 /**
30 * A comparator for UUID. We simply use the UUID compareTo method.
31 *
32 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
33 */
34 public class UuidComparator extends SerializableComparator<String>
35 {
36 /** The serial version UID */
37 private static final long serialVersionUID = 2L;
38
39 /** A logger for this class */
40 private static final Logger LOG = LoggerFactory.getLogger( UuidComparator.class );
41 private static final boolean IS_DEBUG = LOG.isDebugEnabled();
42
43 /** A static instance of the UuidComparator */
44 public static final UuidComparator INSTANCE = new UuidComparator( "1.3.6.1.1.16.4" );
45
46
47 /**
48 * The UUIDComparator constructor. Its OID is the UUIDMatch matching
49 * rule OID.
50 *
51 * @param oid The Comparator's OID
52 */
53 public UuidComparator( String oid )
54 {
55 super( oid );
56 }
57
58
59 /**
60 * {@inheritDoc}
61 */
62 @Override
63 public int compare( String uuid1, String uuid2 )
64 {
65 if ( IS_DEBUG )
66 {
67 LOG.debug( "comparing UUID objects '{}' with '{}'", uuid1, uuid2 );
68 }
69
70 // -------------------------------------------------------------------
71 // Handle some basis cases
72 // -------------------------------------------------------------------
73 if ( uuid1 == null )
74 {
75 return ( uuid2 == null ) ? 0 : -1;
76 }
77
78 if ( uuid2 == null )
79 {
80 return 1;
81 }
82
83 return uuid1.compareTo( uuid2 );
84 }
85
86
87 /**
88 * Compare two UUID.
89 *
90 * @param uuid1 The first UUID
91 * @param uuid2 he second UUID
92 * @return -1 if the first UUID is lower than the second UUID, 1 if it's higher, 0
93 * if they are equal
94 */
95 public int compare( UUID uuid1, UUID uuid2 )
96 {
97 if ( IS_DEBUG )
98 {
99 LOG.debug( "comparing UUID objects '{}' with '{}'", uuid1, uuid2 );
100 }
101
102 // -------------------------------------------------------------------
103 // Handle some basis cases
104 // -------------------------------------------------------------------
105 if ( uuid1 == null )
106 {
107 return ( uuid2 == null ) ? 0 : -1;
108 }
109
110 if ( uuid2 == null )
111 {
112 return 1;
113 }
114
115 return uuid1.compareTo( uuid2 );
116 }
117 }