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 * https://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 * @param <T> The type of object to compare
32 *
33 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
34 */
35 public class ObjectClassTypeComparator<T> extends LdapComparator<T>
36 {
37 /** The serial version UID */
38 private static final long serialVersionUID = 2L;
39
40
41 /**
42 * Creates a new instance of ObjectClassTypeComparator.
43 *
44 * @param oid The Comparator's OID
45 */
46 public ObjectClassTypeComparator( String oid )
47 {
48 super( oid );
49 }
50
51
52 /**
53 * {@inheritDoc}
54 */
55 @Override
56 public int compare( T o1, T o2 )
57 {
58 String s1 = getString( o1 );
59 String s2 = getString( o2 );
60
61 if ( s1 == null && s2 == null )
62 {
63 return 0;
64 }
65
66 if ( s1 == null )
67 {
68 return -1;
69 }
70
71 if ( s2 == null )
72 {
73 return 1;
74 }
75
76 return s1.compareTo( s2 );
77 }
78
79
80 String getString( T obj )
81 {
82 String strValue;
83
84 if ( obj == null )
85 {
86 return null;
87 }
88
89 if ( obj instanceof String )
90 {
91 strValue = ( String ) obj;
92 }
93 else if ( obj instanceof byte[] )
94 {
95 strValue = Strings.utf8ToString( ( byte[] ) obj );
96 }
97 else
98 {
99 strValue = obj.toString();
100 }
101
102 return strValue;
103 }
104 }