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 UUID. We simply use the UUID compareTo method. 030 * 031 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 032 * @version $Rev$ 033 */ 034 public class UUIDComparator extends LdapComparator<String> 035 { 036 /** A logger for this class */ 037 private static final Logger LOG = LoggerFactory.getLogger( UUIDComparator.class ); 038 039 /** The serialVersionUID */ 040 private static final long serialVersionUID = 1L; 041 042 /** 043 * The UUIDComparator constructor. Its OID is the UUIDMatch matching 044 * rule OID. 045 */ 046 public UUIDComparator( String oid ) 047 { 048 super( oid ); 049 } 050 051 052 /** 053 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object) 054 */ 055 public int compare( String uuid1, String uuid2 ) 056 { 057 LOG.debug( "comparing UUID objects '{}' with '{}'", uuid1, uuid2 ); 058 059 // ------------------------------------------------------------------- 060 // Handle some basis cases 061 // ------------------------------------------------------------------- 062 if ( uuid1 == null ) 063 { 064 return ( uuid2 == null ) ? 0 : -1; 065 } 066 067 if ( uuid2 == null ) 068 { 069 return 1; 070 } 071 072 return uuid1.compareTo( uuid2 ); 073 } 074 }