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 */
020 package org.apache.directory.shared.ldap.schema.comparators;
021
022
023 import org.apache.directory.shared.ldap.schema.LdapComparator;
024 import org.slf4j.Logger;
025 import 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 * @version $Rev$
035 */
036 public class CsnSidComparator extends LdapComparator<String>
037 {
038 /** A logger for this class */
039 private static final Logger LOG = LoggerFactory.getLogger( CsnSidComparator.class );
040
041 /** The serialVersionUID */
042 private static final long serialVersionUID = 1L;
043
044 /**
045 * The CsnSidComparator constructor. Its OID is the CsnSidMatch matching
046 * rule OID.
047 */
048 public CsnSidComparator( String oid )
049 {
050 super( oid );
051 }
052
053
054 /**
055 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
056 */
057 public int compare( String sidStr1, String sidStr2 )
058 {
059 LOG.debug( "comparing CSN SID objects '{}' with '{}'", sidStr1, sidStr2 );
060
061 // -------------------------------------------------------------------
062 // Handle some basis cases
063 // -------------------------------------------------------------------
064 if ( sidStr1 == null )
065 {
066 return ( sidStr2 == null ) ? 0 : -1;
067 }
068
069 if ( sidStr2 == null )
070 {
071 return 1;
072 }
073
074 int sid1 = 0;
075 int sid2 = 0;
076
077 try
078 {
079 sid1 = Integer.parseInt( sidStr1, 16 );
080 }
081 catch ( NumberFormatException nfe )
082 {
083 return -1;
084 }
085
086 try
087 {
088 sid2 = Integer.parseInt( sidStr2, 16 );
089 }
090 catch ( NumberFormatException nfe )
091 {
092 return 1;
093 }
094
095 if ( sid1 > sid2 )
096 {
097 return 1;
098 }
099 else if ( sid2 > sid1 )
100 {
101 return -1;
102 }
103
104 return 0;
105 }
106 }