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 * @param <T> The type of object to compare 032 * 033 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 034 */ 035public class ObjectClassTypeComparator<T> extends LdapComparator<T> 036{ 037 /** The serial version UID */ 038 private static final long serialVersionUID = 2L; 039 040 041 /** 042 * Creates a new instance of ObjectClassTypeComparator. 043 * 044 * @param oid The Comparator's OID 045 */ 046 public ObjectClassTypeComparator( String oid ) 047 { 048 super( oid ); 049 } 050 051 052 /** 053 * {@inheritDoc} 054 */ 055 @Override 056 public int compare( T o1, T o2 ) 057 { 058 String s1 = getString( o1 ); 059 String s2 = getString( o2 ); 060 061 if ( s1 == null && s2 == null ) 062 { 063 return 0; 064 } 065 066 if ( s1 == null ) 067 { 068 return -1; 069 } 070 071 if ( s2 == null ) 072 { 073 return 1; 074 } 075 076 return s1.compareTo( s2 ); 077 } 078 079 080 String getString( T obj ) 081 { 082 String strValue; 083 084 if ( obj == null ) 085 { 086 return null; 087 } 088 089 if ( obj instanceof String ) 090 { 091 strValue = ( String ) obj; 092 } 093 else if ( obj instanceof byte[] ) 094 { 095 strValue = Strings.utf8ToString( ( byte[] ) obj ); 096 } 097 else 098 { 099 strValue = obj.toString(); 100 } 101 102 return strValue; 103 } 104}