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 the objectIdentifierMatch matchingRule.
30 *
31 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
32 */
33 public class ObjectIdentifierComparator extends LdapComparator<Object>
34 {
35 /** The serial version UID */
36 private static final long serialVersionUID = 2L;
37
38 /** A logger for this class */
39 private static final Logger LOG = LoggerFactory.getLogger( ObjectIdentifierComparator.class );
40
41
42 /**
43 * The ObjectIdentifierComparator constructor. Its OID is the ObjectIdentifierMatch matching
44 * rule OID.
45 */
46 public ObjectIdentifierComparator( String oid )
47 {
48 super( oid );
49 }
50
51
52 /**
53 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
54 */
55 public int compare( Object o1, Object o2 )
56 {
57 LOG.debug( "comparing ObjectIdentifier objects '{}' with '{}'", o1, o2 );
58
59 // -------------------------------------------------------------------
60 // Handle some basis cases
61 // -------------------------------------------------------------------
62 if ( o1 == null )
63 {
64 return ( o2 == null ) ? 0 : -1;
65 }
66 else if ( o2 == null )
67 {
68 return 1;
69 }
70
71 if ( o1.equals( o2 ) )
72 {
73 return 0;
74 }
75
76 if ( !( o1 instanceof String && o2 instanceof String ) )
77 {
78 // Both objects must be strings...
79 if ( o1.equals( o2 ) )
80 {
81 return 0;
82 }
83
84 return -1;
85 }
86
87 // Here, we should leverage the SchemaManager to compare the String and teh OID
88 return ( ( String ) o1 ).compareToIgnoreCase( ( String ) o2 );
89 }
90 }