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 java.util.Comparator; 024 025 import org.apache.directory.shared.i18n.I18n; 026 import org.apache.directory.shared.ldap.exception.LdapException; 027 import org.apache.directory.shared.ldap.schema.LdapComparator; 028 import org.apache.directory.shared.ldap.schema.SchemaManager; 029 030 031 /** 032 * A serializable wrapper around a Comparator which uses delayed initialization 033 * of the underlying wrapped comparator which is JIT resolved from a static 034 * global registry. 035 * 036 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 037 * @version $Rev: 923524 $ 038 */ 039 public class SerializableComparator<E> extends LdapComparator<E> 040 { 041 private static final long serialVersionUID = 3257566226288162870L; 042 043 /** the OID of the matchingRule for this comparator */ 044 private String matchingRuleOid; 045 046 /** the transient wrapped comparator */ 047 private transient Comparator<E> wrapped; 048 049 /** A reference to the schema manager */ 050 private transient SchemaManager schemaManager; 051 052 // ------------------------------------------------------------------------ 053 // C O N T R U C T O R S 054 // ------------------------------------------------------------------------ 055 public SerializableComparator( String matchingRuleOid ) 056 { 057 super( matchingRuleOid ); 058 this.matchingRuleOid = matchingRuleOid; 059 } 060 061 062 // ------------------------------------------------------------------------ 063 // C O M P A R A T O R I M P L E M E N T A T I O N S 064 // ------------------------------------------------------------------------ 065 066 /** 067 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object) 068 */ 069 @SuppressWarnings("unchecked") 070 public int compare( E o1, E o2 ) 071 { 072 if ( wrapped == null ) 073 { 074 try 075 { 076 wrapped = (Comparator<E>)schemaManager.lookupComparatorRegistry( matchingRuleOid ); 077 } 078 catch ( LdapException e ) 079 { 080 throw new RuntimeException( I18n.err( I18n.ERR_04221, matchingRuleOid ) ); 081 } 082 } 083 084 return wrapped.compare( o1, o2 ); 085 } 086 087 088 /** 089 * @param schemaManager the schemaManager to set 090 */ 091 public void setSchemaManager( SchemaManager schemaManager ) 092 { 093 if ( wrapped == null ) 094 { 095 try 096 { 097 wrapped = (Comparator<E>)schemaManager.lookupComparatorRegistry( matchingRuleOid ); 098 } 099 catch ( LdapException ne ) 100 { 101 // Not found : get the default comparator 102 wrapped = (Comparator<E>)new ComparableComparator<Comparable<E>>( matchingRuleOid ); 103 } 104 } 105 106 ((LdapComparator<E>)wrapped).setSchemaManager( schemaManager ); 107 super.setSchemaManager( schemaManager ); 108 } 109 }