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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   * @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       * 
43       * Creates a new instance of ObjectClassTypeComparator.
44       *
45       * @param oid The Comparator's OID
46       */
47      public ObjectClassTypeComparator( String oid )
48      {
49          super( oid );
50      }
51  
52  
53      /**
54       * {@inheritDoc}
55       */
56      @Override
57      public int compare( T o1, T o2 )
58      {
59          String s1 = getString( o1 );
60          String s2 = getString( o2 );
61  
62          if ( s1 == null && s2 == null )
63          {
64              return 0;
65          }
66  
67          if ( s1 == null )
68          {
69              return -1;
70          }
71  
72          if ( s2 == null )
73          {
74              return 1;
75          }
76  
77          return s1.compareTo( s2 );
78      }
79  
80  
81      String getString( T obj )
82      {
83          String strValue;
84  
85          if ( obj == null )
86          {
87              return null;
88          }
89  
90          if ( obj instanceof String )
91          {
92              strValue = ( String ) obj;
93          }
94          else if ( obj instanceof byte[] )
95          {
96              strValue = Strings.utf8ToString( ( byte[] ) obj );
97          }
98          else
99          {
100             strValue = obj.toString();
101         }
102 
103         return strValue;
104     }
105 }