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.slf4j.Logger; 026import org.slf4j.LoggerFactory; 027 028 029/** 030 * A comparator for UUID. We simply use the UUID compareTo method. 031 * 032 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 033 */ 034public class UuidComparator extends SerializableComparator<String> 035{ 036 /** The serial version UID */ 037 private static final long serialVersionUID = 2L; 038 039 /** A logger for this class */ 040 private static final Logger LOG = LoggerFactory.getLogger( UuidComparator.class ); 041 private static final boolean IS_DEBUG = LOG.isDebugEnabled(); 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 ( IS_DEBUG ) 066 { 067 LOG.debug( "comparing UUID objects '{}' with '{}'", uuid1, uuid2 ); 068 } 069 070 // ------------------------------------------------------------------- 071 // Handle some basis cases 072 // ------------------------------------------------------------------- 073 if ( uuid1 == null ) 074 { 075 return ( uuid2 == null ) ? 0 : -1; 076 } 077 078 if ( uuid2 == null ) 079 { 080 return 1; 081 } 082 083 return uuid1.compareTo( uuid2 ); 084 } 085 086 087 /** 088 * Compare two UUID. 089 * 090 * @param uuid1 The first UUID 091 * @param uuid2 he second UUID 092 * @return -1 if the first UUID is lower than the second UUID, 1 if it's higher, 0 093 * if they are equal 094 */ 095 public int compare( UUID uuid1, UUID uuid2 ) 096 { 097 if ( IS_DEBUG ) 098 { 099 LOG.debug( "comparing UUID objects '{}' with '{}'", uuid1, uuid2 ); 100 } 101 102 // ------------------------------------------------------------------- 103 // Handle some basis cases 104 // ------------------------------------------------------------------- 105 if ( uuid1 == null ) 106 { 107 return ( uuid2 == null ) ? 0 : -1; 108 } 109 110 if ( uuid2 == null ) 111 { 112 return 1; 113 } 114 115 return uuid1.compareTo( uuid2 ); 116 } 117}