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 org.apache.directory.api.ldap.model.schema.LdapComparator; 024import org.slf4j.Logger; 025import 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 */ 033public class ObjectIdentifierComparator extends LdapComparator<Object> 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( ObjectIdentifierComparator.class ); 040 041 042 /** 043 * The ObjectIdentifierComparator constructor. Its OID is the ObjectIdentifierMatch matching 044 * rule OID. 045 */ 046 public ObjectIdentifierComparator( 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( Object o1, Object o2 ) 056 { 057 LOG.debug( "comparing ObjectIdentifier objects '{}' with '{}'", o1, o2 ); 058 059 // ------------------------------------------------------------------- 060 // Handle some basis cases 061 // ------------------------------------------------------------------- 062 if ( o1 == null ) 063 { 064 return ( o2 == null ) ? 0 : -1; 065 } 066 else if ( o2 == null ) 067 { 068 return 1; 069 } 070 071 if ( o1.equals( o2 ) ) 072 { 073 return 0; 074 } 075 076 if ( !( o1 instanceof String && o2 instanceof String ) ) 077 { 078 // Both objects must be strings... 079 if ( o1.equals( o2 ) ) 080 { 081 return 0; 082 } 083 084 return -1; 085 } 086 087 // Here, we should leverage the SchemaManager to compare the String and teh OID 088 return ( ( String ) o1 ).compareToIgnoreCase( ( String ) o2 ); 089 } 090}