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.apache.directory.api.util.Strings;
25
26
27 /**
28 * A comparator that compares the objectClass type with values: AUXILIARY,
29 * ABSTRACT, and STRUCTURAL.
30 *
31 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
32 */
33 public class ObjectClassTypeComparator<T> extends LdapComparator<T>
34 {
35 /** The serial version UID */
36 private static final long serialVersionUID = 2L;
37
38
39 public ObjectClassTypeComparator( String oid )
40 {
41 super( oid );
42 }
43
44
45 public int compare( T o1, T o2 )
46 {
47 String s1 = getString( o1 );
48 String s2 = getString( o2 );
49
50 if ( s1 == null && s2 == null )
51 {
52 return 0;
53 }
54
55 if ( s1 == null )
56 {
57 return -1;
58 }
59
60 if ( s2 == null )
61 {
62 return 1;
63 }
64
65 return s1.compareTo( s2 );
66 }
67
68
69 String getString( T obj )
70 {
71 String strValue;
72
73 if ( obj == null )
74 {
75 return null;
76 }
77
78 if ( obj instanceof String )
79 {
80 strValue = ( String ) obj;
81 }
82 else if ( obj instanceof byte[] )
83 {
84 strValue = Strings.utf8ToString( ( byte[] ) obj );
85 }
86 else
87 {
88 strValue = obj.toString();
89 }
90
91 return strValue;
92 }
93 }