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.apache.directory.api.util.Strings; 025 026 027/** 028 * A comparator that compares the objectClass type with values: AUXILIARY, 029 * ABSTRACT, and STRUCTURAL. 030 * 031 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 032 */ 033public class ObjectClassTypeComparator<T> extends LdapComparator<T> 034{ 035 /** The serial version UID */ 036 private static final long serialVersionUID = 2L; 037 038 039 public ObjectClassTypeComparator( String oid ) 040 { 041 super( oid ); 042 } 043 044 045 public int compare( T o1, T o2 ) 046 { 047 String s1 = getString( o1 ); 048 String s2 = getString( o2 ); 049 050 if ( s1 == null && s2 == null ) 051 { 052 return 0; 053 } 054 055 if ( s1 == null ) 056 { 057 return -1; 058 } 059 060 if ( s2 == null ) 061 { 062 return 1; 063 } 064 065 return s1.compareTo( s2 ); 066 } 067 068 069 String getString( T obj ) 070 { 071 String strValue; 072 073 if ( obj == null ) 074 { 075 return null; 076 } 077 078 if ( obj instanceof String ) 079 { 080 strValue = ( String ) obj; 081 } 082 else if ( obj instanceof byte[] ) 083 { 084 strValue = Strings.utf8ToString( ( byte[] ) obj ); 085 } 086 else 087 { 088 strValue = obj.toString(); 089 } 090 091 return strValue; 092 } 093}