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 java.util.UUID; 024 025import org.apache.directory.api.i18n.I18n; 026import org.slf4j.Logger; 027import org.slf4j.LoggerFactory; 028 029 030/** 031 * A comparator for UUID. We simply use the UUID compareTo method. 032 * 033 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 034 */ 035public class UuidComparator extends SerializableComparator<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( UuidComparator.class ); 042 043 /** A static instance of the UuidComparator */ 044 public static final UuidComparator INSTANCE = new UuidComparator( "1.3.6.1.1.16.4" ); 045 046 047 /** 048 * The UUIDComparator constructor. Its OID is the UUIDMatch matching 049 * rule OID. 050 * 051 * @param oid The Comparator's OID 052 */ 053 public UuidComparator( String oid ) 054 { 055 super( oid ); 056 } 057 058 059 /** 060 * {@inheritDoc} 061 */ 062 @Override 063 public int compare( String uuid1, String uuid2 ) 064 { 065 if ( LOG.isDebugEnabled() ) 066 { 067 LOG.debug( I18n.msg( I18n.MSG_13751_COMPARING_UUID, uuid1, uuid2 ) ); 068 } 069 070 // ------------------------------------------------------------------- 071 // Handle some basis cases 072 // ------------------------------------------------------------------- 073 if ( uuid1 == null ) 074 { 075 return -1; 076 } 077 078 return uuid1.compareTo( uuid2 ); 079 } 080 081 082 /** 083 * Compare two UUID. 084 * 085 * @param uuid1 The first UUID 086 * @param uuid2 he second UUID 087 * @return -1 if the first UUID is lower than the second UUID, 1 if it's higher, 0 088 * if they are equal 089 */ 090 public int compare( UUID uuid1, UUID uuid2 ) 091 { 092 if ( LOG.isDebugEnabled() ) 093 { 094 LOG.debug( I18n.msg( I18n.MSG_13751_COMPARING_UUID, uuid1, uuid2 ) ); 095 } 096 097 // ------------------------------------------------------------------- 098 // Handle some basis cases 099 // ------------------------------------------------------------------- 100 if ( uuid1 == null ) 101 { 102 return ( uuid2 == null ) ? 0 : -1; 103 } 104 105 if ( uuid2 == null ) 106 { 107 return 1; 108 } 109 110 return uuid1.compareTo( uuid2 ); 111 } 112}