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.i18n.I18n; 024import org.apache.directory.api.ldap.model.exception.LdapException; 025import org.apache.directory.api.ldap.model.exception.LdapInvalidDnException; 026import org.apache.directory.api.ldap.model.name.Dn; 027import org.apache.directory.api.ldap.model.schema.LdapComparator; 028import org.apache.directory.api.ldap.model.schema.SchemaManager; 029 030 031/** 032 * Compare two DNs 033 * 034 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 035 */ 036public class DnComparator extends LdapComparator<Object> 037{ 038 /** The serial version UID */ 039 private static final long serialVersionUID = 2L; 040 041 /** A reference to the schema manager */ 042 private SchemaManager schemaManager; 043 044 public DnComparator( String oid ) 045 { 046 super( oid ); 047 } 048 049 050 /** 051 * {@inheritDoc} 052 */ 053 public int compare( Object obj0, Object obj1 ) 054 { 055 Dn dn0 = null; 056 Dn dn1 = null; 057 058 try 059 { 060 dn0 = getDn( obj0 ); 061 dn1 = getDn( obj1 ); 062 } 063 catch ( LdapException e ) 064 { 065 // -- what do we do here ? 066 return -1; 067 } 068 069 int dn0Size = dn0.getRdns().size(); 070 int dn1Size = dn1.getRdns().size(); 071 072 // check the equality first, cause 073 // when both DNs are equal checking isAncestorOf() returns true 074 if ( dn0.equals( dn1 ) ) 075 { 076 return 0; 077 } 078 else if ( dn0Size > dn1Size ) 079 { 080 return -1; 081 } 082 else if ( dn1Size > dn0Size ) 083 { 084 return 1; 085 } 086 087 return dn0.getNormName().compareTo( dn1.getNormName() ); 088 } 089 090 091 private Dn getDn( Object obj ) throws LdapInvalidDnException 092 { 093 Dn dn = null; 094 095 if ( obj instanceof Dn ) 096 { 097 dn = ( Dn ) obj; 098 099 dn = ( dn.isSchemaAware() ? dn : dn.apply( schemaManager ) ); 100 } 101 else if ( obj instanceof String ) 102 { 103 dn = new Dn( schemaManager, ( String ) obj ); 104 } 105 else 106 { 107 throw new IllegalStateException( I18n.err( I18n.ERR_04218, ( obj == null ? null : obj.getClass() ) ) ); 108 } 109 110 return dn; 111 } 112 113 114 /** 115 * {@inheritDoc} 116 */ 117 public void setSchemaManager( SchemaManager schemaManager ) 118 { 119 this.schemaManager = schemaManager; 120 } 121}