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.server.core.partition.impl.btree.mavibot;
021
022import java.util.Comparator;
023
024import org.apache.directory.api.ldap.model.name.Dn;
025import org.apache.directory.api.ldap.model.schema.comparators.DnComparator;
026import org.apache.directory.mavibot.btree.Tuple;
027
028/**
029 * TODO LdifTupleComparator.
030 *
031 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
032 */
033public class LdifTupleComparator implements Comparator<Tuple<Dn, String>>
034{
035    /** The DN comparator to use */
036    DnComparator comparator = new DnComparator( null );
037
038    @Override
039    public int compare( Tuple<Dn, String> t1, Tuple<Dn, String> t2 )
040    {
041        Dn dn1 = t1.getKey();
042        Dn dn2 = t2.getKey();
043
044        if ( dn1.isAncestorOf( dn2 ) )
045        {
046            return -1;
047        }
048        else if ( dn2.isAncestorOf( dn1 ) )
049        {
050            return 1;
051        }
052        else if ( dn1.equals( dn2 ) )
053        {
054            return 0;
055        }
056
057        return comparator.compare( dn1,  dn2 );
058    }
059}