/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *  
 *    http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License. 
 *  
 */
package org.apache.directory.server.core.partition.impl.btree.jdbm;


import org.apache.directory.api.ldap.model.name.Dn;
import org.apache.directory.api.ldap.model.schema.comparators.SerializableComparator;


/**
 * A comparator used to compare {@link Dn} stored in the Dn index.
 *  
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 */
public class DnSerializerComparator extends SerializableComparator<Dn>
{
    /** The serialVersionUID */
    private static final long serialVersionUID = 1L;


    /**
     * Creates a new instance of DnSerializer.
     * 
     * @param schemaManager The reference to the global schemaManager
     */
    public DnSerializerComparator( String oid )
    {
        super( oid );
    }


    /**
     * {@inheritDoc}
     */
    @Override
    public int compare( Dn dn1, Dn dn2 )
    {
        if ( dn1 == null )
        {
            if ( dn2 == null )
            {
                return 0;
            }

            return -1;
        }

        if ( dn2 == null )
        {
            return 1;
        }

        return dn1.getNormName().compareTo( dn2.getNormName() );
    }
}
