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 UUID. We simply use the UUID compareTo method. 030 * 031 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 032 */ 033public class UUIDComparator extends LdapComparator<String> 034{ 035 /** The serial version UID */ 036 private static final long serialVersionUID = 2L; 037 038 /** A logger for this class */ 039 private static final Logger LOG = LoggerFactory.getLogger( UUIDComparator.class ); 040 041 /** 042 * The UUIDComparator constructor. Its OID is the UUIDMatch matching 043 * rule OID. 044 */ 045 public UUIDComparator( String oid ) 046 { 047 super( oid ); 048 } 049 050 051 /** 052 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object) 053 */ 054 public int compare( String uuid1, String uuid2 ) 055 { 056 LOG.debug( "comparing UUID objects '{}' with '{}'", uuid1, uuid2 ); 057 058 // ------------------------------------------------------------------- 059 // Handle some basis cases 060 // ------------------------------------------------------------------- 061 if ( uuid1 == null ) 062 { 063 return ( uuid2 == null ) ? 0 : -1; 064 } 065 066 if ( uuid2 == null ) 067 { 068 return 1; 069 } 070 071 return uuid1.compareTo( uuid2 ); 072 } 073}