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Java > Open Source Codes > com > db4o > YapFieldNull


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;
22
23 import com.db4o.inside.marshall.*;
24
25 class YapFieldNull extends YapField{
26     
27     public YapFieldNull(){
28         super(null);
29     }
30     
31     YapComparable prepareComparison(Object JavaDoc obj){
32         return Null.INSTANCE;
33     }
34     
35     Object JavaDoc read(MarshallerFamily mf, YapWriter a_bytes) {
36         return null;
37     }
38     
39     Object JavaDoc readQuery(Transaction a_trans, MarshallerFamily mf, YapReader a_reader) throws CorruptionException {
40         return null;
41     }
42 }
43
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