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Java > Open Source Codes > org > apache > ojb > odmg > OJB


1 package org.apache.ojb.odmg;
2
3 /* Copyright 2002-2005 The Apache Software Foundation
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 import org.apache.ojb.broker.util.factory.ConfigurableFactory;
19 import org.odmg.Implementation;
20
21
22 /**
23  * Facade to the persistence ObjectServer system.
24  * Implements the factory interface for a particular ODMG implementation.
25  *
26  * @author <a HREF="mailto:armin@codeAuLait.de">Armin Waibel</a>
27  * @version $Id: OJB.java,v 1.17.2.2 2005/12/21 22:29:21 tomdz Exp $
28  */
29 public class OJB extends ConfigurableFactory
30 {
31     private static OJB instance;
32
33     static
34     {
35         instance = new OJB();
36     }
37
38     /**
39      * protected Constructor: use static factory method
40      * getInstance() to obtain an instance of {@link Implementation}
41      */
42     protected OJB()
43     {
44     }
45
46     /**
47      * Return new instance of the {@link org.odmg.Implementation} class.
48      * The used implementation class can be specified in OJB properties file.
49      */
50     public static ImplementationExt getInstance()
51     {
52         return (ImplementationExt) instance.createNewInstance();
53     }
54
55     protected String JavaDoc getConfigurationKey()
56     {
57         return "ImplementationClass";
58     }
59 }
60
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