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.shared.ldap.model.schema.comparators; 021 022 023import org.apache.directory.shared.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 * The CsnSidComparator constructor. Its OID is the CsnSidMatch matching 045 * rule OID. 046 */ 047 public CsnSidComparator( String oid ) 048 { 049 super( oid ); 050 } 051 052 053 /** 054 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object) 055 */ 056 public int compare( String sidStr1, String sidStr2 ) 057 { 058 LOG.debug( "comparing CSN SID objects '{}' with '{}'", sidStr1, sidStr2 ); 059 060 // ------------------------------------------------------------------- 061 // Handle some basis cases 062 // ------------------------------------------------------------------- 063 if ( sidStr1 == null ) 064 { 065 return ( sidStr2 == null ) ? 0 : -1; 066 } 067 068 if ( sidStr2 == null ) 069 { 070 return 1; 071 } 072 073 int sid1 = 0; 074 int sid2 = 0; 075 076 try 077 { 078 sid1 = Integer.parseInt( sidStr1, 16 ); 079 } 080 catch ( NumberFormatException nfe ) 081 { 082 return -1; 083 } 084 085 try 086 { 087 sid2 = Integer.parseInt( sidStr2, 16 ); 088 } 089 catch ( NumberFormatException nfe ) 090 { 091 return 1; 092 } 093 094 if ( sid1 > sid2 ) 095 { 096 return 1; 097 } 098 else if ( sid2 > sid1 ) 099 { 100 return -1; 101 } 102 103 return 0; 104 } 105}