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.internal.btree;
22:
23: import com.db4o.foundation.*;
24: import com.db4o.internal.*;
25:
26: /**
27: * @exclude
28: */
29: public class BTreeAdd extends BTreePatch {
30:
31: public BTreeAdd(Transaction transaction, Object obj) {
32: super (transaction, obj);
33: }
34:
35: protected Object rolledBack(BTree btree) {
36: btree.notifyRemoveListener(getObject());
37: return No4.INSTANCE;
38: }
39:
40: public String toString() {
41: return "(+) " + super .toString();
42: }
43:
44: public Object 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 key(Transaction trans) {
59: if (_transaction != trans) {
60: return No4.INSTANCE;
61: }
62: return getObject();
63: }
64:
65: public Object 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: }
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