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 */
020package org.apache.directory.api.ldap.model.schema.comparators;
021
022
023import org.apache.directory.api.ldap.model.schema.LdapComparator;
024import org.slf4j.Logger;
025import 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 */
033public class ObjectIdentifierComparator extends LdapComparator<Object>
034{
035    /** The serial version UID */
036    private static final long serialVersionUID = 2L;
037
038    /** A logger for this class */
039    private static final Logger LOG = LoggerFactory.getLogger( ObjectIdentifierComparator.class );
040
041
042    /**
043     * The ObjectIdentifierComparator constructor. Its OID is the ObjectIdentifierMatch matching
044     * rule OID.
045     */
046    public ObjectIdentifierComparator( String oid )
047    {
048        super( oid );
049    }
050
051
052    /**
053     * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
054     */
055    public int compare( Object o1, Object o2 )
056    {
057        LOG.debug( "comparing ObjectIdentifier objects '{}' with '{}'", o1, o2 );
058
059        // -------------------------------------------------------------------
060        // Handle some basis cases
061        // -------------------------------------------------------------------
062        if ( o1 == null )
063        {
064            return ( o2 == null ) ? 0 : -1;
065        }
066        else if ( o2 == null )
067        {
068            return 1;
069        }
070
071        if ( o1.equals( o2 ) )
072        {
073            return 0;
074        }
075
076        if ( !( o1 instanceof String && o2 instanceof String ) )
077        {
078            // Both objects must be strings...
079            if ( o1.equals( o2 ) )
080            {
081                return 0;
082            }
083
084            return -1;
085        }
086
087        // Here, we should leverage the SchemaManager to compare the String and teh OID
088        return ( ( String ) o1 ).compareToIgnoreCase( ( String ) o2 );
089    }
090}