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 public CsnSidComparator( String oid )
49 {
50 super( oid );
51 }
52
53
54 /**
55 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
56 */
57 public int compare( String sidStr1, String sidStr2 )
58 {
59 LOG.debug( "comparing CSN SID objects '{}' with '{}'", sidStr1, sidStr2 );
60
61 // -------------------------------------------------------------------
62 // Handle some basis cases
63 // -------------------------------------------------------------------
64 if ( sidStr1 == null )
65 {
66 return ( sidStr2 == null ) ? 0 : -1;
67 }
68
69 if ( sidStr2 == null )
70 {
71 return 1;
72 }
73
74 int sid1 = 0;
75 int sid2 = 0;
76
77 try
78 {
79 sid1 = Integer.parseInt( sidStr1, 16 );
80 }
81 catch ( NumberFormatException nfe )
82 {
83 return -1;
84 }
85
86 try
87 {
88 sid2 = Integer.parseInt( sidStr2, 16 );
89 }
90 catch ( NumberFormatException nfe )
91 {
92 return 1;
93 }
94
95 if ( sid1 > sid2 )
96 {
97 return 1;
98 }
99 else if ( sid2 > sid1 )
100 {
101 return -1;
102 }
103
104 return 0;
105 }
106 }