01: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
02:
03: This file is part of the db4o open source object database.
04:
05: db4o is free software; you can redistribute it and/or modify it under
06: the terms of version 2 of the GNU General Public License as published
07: by the Free Software Foundation and as clarified by db4objects' GPL
08: interpretation policy, available at
09: 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.config;
22:
23: import com.db4o.*;
24:
25: /**
26: * interface to allow instantiating objects by calling specific constructors.
27: * <br><br>
28: * By writing classes that implement this interface, it is possible to
29: * define which constructor is to be used during the instantiation of a stored object.
30: * <br><br>
31: * Before starting a db4o session, translator classes that implement the
32: * <code>ObjectConstructor</code> or
33: * {@link ObjectTranslator ObjectTranslator}
34: * need to be registered.<br><br>
35: * Example:<br>
36: * <code>
37: * Configuration config = Db4o.configure();<br>
38: * ObjectClass oc = config.objectClass("package.className");<br>
39: * oc.translate(new FooTranslator());</code><br><br>
40: */
41: public interface ObjectConstructor extends ObjectTranslator {
42:
43: /**
44: * db4o calls this method when a stored object needs to be instantiated.
45: * <br><br>
46: * @param container the ObjectContainer used
47: * @param storedObject the object stored with
48: * {@link ObjectTranslator#onStore ObjectTranslator.onStore}.
49: * @return the instantiated object.
50: */
51: public Object onInstantiate(ObjectContainer container,
52: Object storedObject);
53:
54: }
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