001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied. See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 *
019 */
020 package org.apache.directory.shared.ldap.schema.comparators;
021
022
023 import org.apache.directory.shared.ldap.schema.LdapComparator;
024 import org.slf4j.Logger;
025 import org.slf4j.LoggerFactory;
026
027
028 /**
029 * A comparator for the objectIdentifierMatch matchingRule.
030 *
031 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
032 * @version $Rev: 896579 $
033 */
034 public class ObjectIdentifierComparator extends LdapComparator<Object>
035 {
036 /** A logger for this class */
037 private static final Logger LOG = LoggerFactory.getLogger( ObjectIdentifierComparator.class );
038
039 /** The serialVersionUID */
040 private static final long serialVersionUID = 1L;
041
042
043 /**
044 * The ObjectIdentifierComparator constructor. Its OID is the ObjectIdentifierMatch matching
045 * rule OID.
046 */
047 public ObjectIdentifierComparator( String oid )
048 {
049 super( oid );
050 }
051
052
053 /**
054 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
055 */
056 public int compare( Object o1, Object o2 )
057 {
058 LOG.debug( "comparing ObjectIdentifier objects '{}' with '{}'", o1, o2 );
059
060 // -------------------------------------------------------------------
061 // Handle some basis cases
062 // -------------------------------------------------------------------
063 if ( o1 == null )
064 {
065 return ( o2 == null ) ? 0 : -1;
066 }
067 else if ( o2 == null )
068 {
069 return 1;
070 }
071
072 if ( o1.equals( o2 ) )
073 {
074 return 0;
075 }
076
077 if ( !( o1 instanceof String && o2 instanceof String ) )
078 {
079 if ( o1.equals( o2 ) )
080 {
081 return 0;
082 }
083
084 return -1;
085 }
086
087 String s1 = ( ( String ) o1 ).trim().toLowerCase(), s2 = ( ( String ) o2 ).trim().toLowerCase();
088 return s1.compareTo( s2 );
089 }
090 }