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Java > Open Source Codes > org > apache > ldap > server > schema > SerializableComparator


1 /*
2  * Copyright 2004 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 package org.apache.ldap.server.schema;
18
19
20 import javax.naming.NamingException JavaDoc;
21 import java.io.Serializable JavaDoc;
22 import java.util.Comparator JavaDoc;
23
24
25 /**
26  * A serializable wrapper around a Comparator which uses delayed initialization
27  * of the underlying wrapped comparator which is JIT resolved from a static
28  * global registry.
29  *
30  * @author <a HREF="mailto:dev@directory.apache.org">Apache Directory Project</a>
31  * @version $Rev: 169198 $
32  */
33 public class SerializableComparator implements Comparator JavaDoc, Serializable JavaDoc
34 {
35     private static final long serialVersionUID = 3257566226288162870L;
36
37     /** the system global Comparator registry */
38     private static ComparatorRegistry registry = null;
39     /** the OID of the matchingRule for this comparator */
40     private String JavaDoc matchingRuleOid;
41     /** the transient wrapped comparator */
42     private transient Comparator JavaDoc wrapped;
43
44
45     // ------------------------------------------------------------------------
46 // S T A T I C M E T H O D S
47 // ------------------------------------------------------------------------
48
49
50     /**
51      * Sets the global Comparator registry for comparator lookups.
52      *
53      * @param registry the comparator registry to use for Comparator lookups
54      */
55     public static void setRegistry( ComparatorRegistry registry )
56     {
57         SerializableComparator.registry = registry;
58     }
59
60
61     // ------------------------------------------------------------------------
62 // C O N T R U C T O R S
63 // ------------------------------------------------------------------------
64
65
66     public SerializableComparator( String JavaDoc matchingRuleOid )
67     {
68         this.matchingRuleOid = matchingRuleOid;
69     }
70
71
72     // ------------------------------------------------------------------------
73 // 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
74 // ------------------------------------------------------------------------
75
76
77     /**
78      * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
79      */
80     public int compare( Object JavaDoc o1, Object JavaDoc o2 )
81     {
82         if ( wrapped == null )
83         {
84             try
85             {
86                 wrapped = registry.lookup( matchingRuleOid );
87             }
88             catch ( NamingException JavaDoc e )
89             {
90                 e.printStackTrace();
91             }
92         }
93
94         return wrapped.compare( o1, o2 );
95     }
96 }
97
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