1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 *
19 */
20 package org.apache.directory.api.ldap.model.schema.comparators;
21
22
23 import java.io.Serializable;
24 import java.util.Comparator;
25
26 import org.apache.directory.api.i18n.I18n;
27 import org.apache.directory.api.ldap.model.exception.LdapException;
28 import org.apache.directory.api.ldap.model.schema.LdapComparator;
29 import org.apache.directory.api.ldap.model.schema.SchemaManager;
30
31
32 /**
33 * A serializable wrapper around a Comparator which uses delayed initialization
34 * of the underlying wrapped comparator which is JIT resolved from a static
35 * global registry.
36 *
37 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
38 */
39 public class SerializableComparator<E> extends LdapComparator<E> implements Serializable
40 {
41 /** The serial version UID */
42 private static final long serialVersionUID = 2L;
43
44 /** the OID of the matchingRule for this comparator */
45 private String matchingRuleOid;
46
47 /** the transient wrapped comparator */
48 private transient Comparator<E> wrapped;
49
50 /** A reference to the schema manager */
51 private transient SchemaManager schemaManager;
52
53
54 // ------------------------------------------------------------------------
55 // C O N T R U C T O R S
56 // ------------------------------------------------------------------------
57 public SerializableComparator( String matchingRuleOid )
58 {
59 super( matchingRuleOid );
60 this.matchingRuleOid = matchingRuleOid;
61 }
62
63
64 // ------------------------------------------------------------------------
65 // 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
66 // ------------------------------------------------------------------------
67
68 /**
69 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
70 */
71 @SuppressWarnings("unchecked")
72 public int compare( E o1, E o2 )
73 {
74 if ( wrapped == null )
75 {
76 try
77 {
78 wrapped = ( Comparator<E> ) schemaManager.lookupComparatorRegistry( matchingRuleOid );
79 }
80 catch ( LdapException e )
81 {
82 throw new RuntimeException( I18n.err( I18n.ERR_04221, matchingRuleOid ) );
83 }
84 }
85
86 return wrapped.compare( o1, o2 );
87 }
88
89
90 /**
91 * @param schemaManager the schemaManager to set
92 */
93 @SuppressWarnings("unchecked")
94 public void setSchemaManager( SchemaManager schemaManager )
95 {
96 if ( wrapped == null )
97 {
98 try
99 {
100 wrapped = ( Comparator<E> )
101 schemaManager.lookupComparatorRegistry( matchingRuleOid );
102 }
103 catch ( LdapException ne )
104 {
105 // Not found : get the default comparator
106 wrapped = ( Comparator<E> )
107 new ComparableComparator<Comparable<E>>( matchingRuleOid );
108 }
109 }
110
111 ( ( LdapComparator<E> ) wrapped ).setSchemaManager( schemaManager );
112 super.setSchemaManager( schemaManager );
113 this.schemaManager = schemaManager;
114 }
115 }