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Java > Open Source Codes > com > db4o > ext > ObjectInfo


1 /* Copyright (C) 2004 - 2006 db4objects Inc. http://www.db4o.com
2
3 This file is part of the db4o open source object database.
4
5 db4o is free software; you can redistribute it and/or modify it under
6 the terms of version 2 of the GNU General Public License as published
7 by the Free Software Foundation and as clarified by db4objects' GPL
8 interpretation policy, available at
9 http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10 Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11 Suite 350, San Mateo, CA 94403, USA.
12
13 db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 package com.db4o.ext;
22
23
24 /**
25  * interface to the internal reference that an ObjectContainer
26  * holds for a stored object.
27  */
28 public interface ObjectInfo {
29     
30     /**
31      * returns the object that is referenced.
32      * <br><br>This method may return null, if the object has
33      * been garbage collected.
34      * @return the referenced object or null, if the object has
35      * been garbage collected.
36      */
37     public Object JavaDoc getObject();
38     
39     /**
40      * returns a UUID representation of the referenced object.
41      * UUID generation has to be turned on, in order to be able
42      * to use this feature:
43      * {@link com.db4o.config.Configuration#generateUUIDs(int)}
44      * @return the UUID of the referenced object.
45      */
46     public Db4oUUID getUUID();
47     
48     /**
49      * returns the transaction serial number ("version") the
50      * referenced object was stored with last.
51      * Version number generation has to be turned on, in order to
52      * be able to use this feature:
53      * {@link com.db4o.config.Configuration#generateVersionNumbers(int)}
54      * @return the version number.
55      */
56     public long getVersion();
57     
58     
59     
60     
61
62 }
63
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