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 }