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 org.apache.directory.api.ldap.model.schema.LdapComparator;
24 import org.slf4j.Logger;
25 import org.slf4j.LoggerFactory;
26
27
28 /**
29 * A comparator for CSN SID.
30 *
31 * The SID is supposed to be an hexadecimal number between 0x0 and 0xfff
32 *
33 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
34 */
35 public class CsnSidComparator extends LdapComparator<String>
36 {
37 /** The serial version UID */
38 private static final long serialVersionUID = 2L;
39
40 /** A logger for this class */
41 private static final Logger LOG = LoggerFactory.getLogger( CsnSidComparator.class );
42
43
44 /**
45 * The CsnSidComparator constructor. Its OID is the CsnSidMatch matching
46 * rule OID.
47 *
48 * @param oid The Comparator's OID
49 */
50 public CsnSidComparator( String oid )
51 {
52 super( oid );
53 }
54
55
56 /**
57 * {@inheritDoc}
58 */
59 public int compare( String sidStr1, String sidStr2 )
60 {
61 LOG.debug( "comparing CSN SID objects '{}' with '{}'", sidStr1, sidStr2 );
62
63 // -------------------------------------------------------------------
64 // Handle some basis cases
65 // -------------------------------------------------------------------
66 if ( sidStr1 == null )
67 {
68 return ( sidStr2 == null ) ? 0 : -1;
69 }
70
71 if ( sidStr2 == null )
72 {
73 return 1;
74 }
75
76 int sid1 = 0;
77 int sid2;
78
79 try
80 {
81 sid1 = Integer.parseInt( sidStr1, 16 );
82 }
83 catch ( NumberFormatException nfe )
84 {
85 return -1;
86 }
87
88 try
89 {
90 sid2 = Integer.parseInt( sidStr2, 16 );
91 }
92 catch ( NumberFormatException nfe )
93 {
94 return 1;
95 }
96
97 if ( sid1 > sid2 )
98 {
99 return 1;
100 }
101 else if ( sid2 > sid1 )
102 {
103 return -1;
104 }
105
106 return 0;
107 }
108 }