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 the objectIdentifierMatch matchingRule. 030 * 031 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 032 * @version $Rev: 896579 $ 033 */ 034 public class ObjectIdentifierComparator extends LdapComparator<Object> 035 { 036 /** A logger for this class */ 037 private static final Logger LOG = LoggerFactory.getLogger( ObjectIdentifierComparator.class ); 038 039 /** The serialVersionUID */ 040 private static final long serialVersionUID = 1L; 041 042 043 /** 044 * The ObjectIdentifierComparator constructor. Its OID is the ObjectIdentifierMatch matching 045 * rule OID. 046 */ 047 public ObjectIdentifierComparator( 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( Object o1, Object o2 ) 057 { 058 LOG.debug( "comparing ObjectIdentifier objects '{}' with '{}'", o1, o2 ); 059 060 // ------------------------------------------------------------------- 061 // Handle some basis cases 062 // ------------------------------------------------------------------- 063 if ( o1 == null ) 064 { 065 return ( o2 == null ) ? 0 : -1; 066 } 067 else if ( o2 == null ) 068 { 069 return 1; 070 } 071 072 if ( o1.equals( o2 ) ) 073 { 074 return 0; 075 } 076 077 if ( !( o1 instanceof String && o2 instanceof String ) ) 078 { 079 if ( o1.equals( o2 ) ) 080 { 081 return 0; 082 } 083 084 return -1; 085 } 086 087 String s1 = ( ( String ) o1 ).trim().toLowerCase(), s2 = ( ( String ) o2 ).trim().toLowerCase(); 088 return s1.compareTo( s2 ); 089 } 090 }