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 javax.naming.NamingException;
026
027 import org.apache.directory.shared.i18n.I18n;
028 import org.apache.directory.shared.ldap.schema.LdapComparator;
029 import org.apache.directory.shared.ldap.schema.SchemaManager;
030
031
032 /**
033 * A serializable wrapper around a Comparator which uses delayed initialization
034 * of the underlying wrapped comparator which is JIT resolved from a static
035 * global registry.
036 *
037 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
038 * @version $Rev: 912436 $
039 */
040 public class SerializableComparator<E> extends LdapComparator<E>
041 {
042 private static final long serialVersionUID = 3257566226288162870L;
043
044 /** the OID of the matchingRule for this comparator */
045 private String matchingRuleOid;
046
047 /** the transient wrapped comparator */
048 private transient Comparator<E> wrapped;
049
050 /** A reference to the schema manager */
051 private transient SchemaManager schemaManager;
052
053 // ------------------------------------------------------------------------
054 // C O N T R U C T O R S
055 // ------------------------------------------------------------------------
056 public SerializableComparator( String matchingRuleOid )
057 {
058 super( matchingRuleOid );
059 this.matchingRuleOid = matchingRuleOid;
060 }
061
062
063 // ------------------------------------------------------------------------
064 // 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
065 // ------------------------------------------------------------------------
066
067 /**
068 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
069 */
070 @SuppressWarnings("unchecked")
071 public int compare( E o1, E o2 )
072 {
073 if ( wrapped == null )
074 {
075 try
076 {
077 wrapped = (Comparator<E>)schemaManager.lookupComparatorRegistry( matchingRuleOid );
078 }
079 catch ( NamingException e )
080 {
081 throw new RuntimeException( I18n.err( I18n.ERR_04221, matchingRuleOid ) );
082 }
083 }
084
085 return wrapped.compare( o1, o2 );
086 }
087
088
089 /**
090 * @param schemaManager the schemaManager to set
091 */
092 public void setSchemaManager( SchemaManager schemaManager )
093 {
094 if ( wrapped == null )
095 {
096 try
097 {
098 wrapped = (Comparator<E>)schemaManager.lookupComparatorRegistry( matchingRuleOid );
099 }
100 catch ( NamingException ne )
101 {
102 // Not found : get the default comparator
103 wrapped = (Comparator<E>)new ComparableComparator<Comparable<E>>( matchingRuleOid );
104 }
105 }
106
107 ((LdapComparator<E>)wrapped).setSchemaManager( schemaManager );
108 super.setSchemaManager( schemaManager );
109 }
110 }