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 CSN SID.
030 *
031 * The SID is supposed to be an hexadecimal number between 0x0 and 0xfff
032 * 
033 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
034 */
035public class CsnSidComparator extends LdapComparator<String>
036{
037    /** The serial version UID */
038    private static final long serialVersionUID = 2L;
039
040    /** A logger for this class */
041    private static final Logger LOG = LoggerFactory.getLogger( CsnSidComparator.class );
042
043
044    /**
045     * The CsnSidComparator constructor. Its OID is the CsnSidMatch matching
046     * rule OID.
047     * 
048     * @param oid The Comparator's OID
049     */
050    public CsnSidComparator( String oid )
051    {
052        super( oid );
053    }
054
055
056    /**
057     * {@inheritDoc}
058     */
059    public int compare( String sidStr1, String sidStr2 )
060    {
061        LOG.debug( "comparing CSN SID objects '{}' with '{}'", sidStr1, sidStr2 );
062
063        // -------------------------------------------------------------------
064        // Handle some basis cases
065        // -------------------------------------------------------------------
066        if ( sidStr1 == null )
067        {
068            return ( sidStr2 == null ) ? 0 : -1;
069        }
070
071        if ( sidStr2 == null )
072        {
073            return 1;
074        }
075
076        int sid1 = 0;
077        int sid2;
078
079        try
080        {
081            sid1 = Integer.parseInt( sidStr1, 16 );
082        }
083        catch ( NumberFormatException nfe )
084        {
085            return -1;
086        }
087
088        try
089        {
090            sid2 = Integer.parseInt( sidStr2, 16 );
091        }
092        catch ( NumberFormatException nfe )
093        {
094            return 1;
095        }
096
097        if ( sid1 > sid2 )
098        {
099            return 1;
100        }
101        else if ( sid2 > sid1 )
102        {
103            return -1;
104        }
105
106        return 0;
107    }
108}