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Java > Open Source Codes > com > db4o > inside > btree > BTreeAdd


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.inside.btree;
22
23 import com.db4o.*;
24 import com.db4o.foundation.*;
25
26 /**
27  * @exclude
28  */
29 public class BTreeAdd extends BTreePatch{
30
31     public BTreeAdd(Transaction transaction, Object JavaDoc obj) {
32         super(transaction, obj);
33     }
34
35     protected Object JavaDoc rolledBack(BTree btree){
36         btree.notifyRemoveListener(getObject());
37         return No4.INSTANCE;
38     }
39     
40     public String JavaDoc toString() {
41         return "(+) " + super.toString();
42     }
43
44     public Object JavaDoc commit(Transaction trans, BTree btree) {
45         if(_transaction == trans){
46             return getObject();
47         }
48         return this;
49     }
50
51     public BTreePatch forTransaction(Transaction trans) {
52         if(_transaction == trans){
53             return this;
54         }
55         return null;
56     }
57     
58     public Object JavaDoc key(Transaction trans) {
59         if (_transaction != trans) {
60             return No4.INSTANCE;
61         }
62         return getObject();
63     }
64
65     public Object JavaDoc rollback(Transaction trans, BTree btree) {
66         if(_transaction == trans){
67             return rolledBack(btree);
68         }
69         return this;
70     }
71
72     public boolean isAdd() {
73         return true;
74     }
75
76 }
77
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