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.apache.directory.api.util.Strings;
025
026
027/**
028 * A comparator that compares the objectClass type with values: AUXILIARY,
029 * ABSTRACT, and STRUCTURAL.
030 * 
031 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
032 */
033public class ObjectClassTypeComparator<T> extends LdapComparator<T>
034{
035    /** The serial version UID */
036    private static final long serialVersionUID = 2L;
037
038
039    public ObjectClassTypeComparator( String oid )
040    {
041        super( oid );
042    }
043
044
045    public int compare( T o1, T o2 )
046    {
047        String s1 = getString( o1 );
048        String s2 = getString( o2 );
049
050        if ( s1 == null && s2 == null )
051        {
052            return 0;
053        }
054
055        if ( s1 == null )
056        {
057            return -1;
058        }
059
060        if ( s2 == null )
061        {
062            return 1;
063        }
064
065        return s1.compareTo( s2 );
066    }
067
068
069    String getString( T obj )
070    {
071        String strValue;
072
073        if ( obj == null )
074        {
075            return null;
076        }
077
078        if ( obj instanceof String )
079        {
080            strValue = ( String ) obj;
081        }
082        else if ( obj instanceof byte[] )
083        {
084            strValue = Strings.utf8ToString( ( byte[] ) obj );
085        }
086        else
087        {
088            strValue = obj.toString();
089        }
090
091        return strValue;
092    }
093}