View Javadoc
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       * @param oid The Comparator's OID
47       */
48      public ObjectIdentifierComparator( String oid )
49      {
50          super( oid );
51      }
52  
53  
54      /**
55       * {@inheritDoc}
56       */
57      @Override
58      public int compare( Object o1, Object o2 )
59      {
60          LOG.debug( "comparing ObjectIdentifier objects '{}' with '{}'", o1, o2 );
61  
62          // -------------------------------------------------------------------
63          // Handle some basis cases
64          // -------------------------------------------------------------------
65          if ( o1 == null )
66          {
67              return ( o2 == null ) ? 0 : -1;
68          }
69          else if ( o2 == null )
70          {
71              return 1;
72          }
73  
74          if ( o1.equals( o2 ) )
75          {
76              return 0;
77          }
78  
79          if ( !( o1 instanceof String && o2 instanceof String ) )
80          {
81              // Both objects must be strings...
82              return -1;
83          }
84  
85          // Here, we should leverage the SchemaManager to compare the String and teh OID
86          return ( ( String ) o1 ).compareToIgnoreCase( ( String ) o2 );
87      }
88  }