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.ix;
22:
23: import com.db4o.foundation.*;
24: import com.db4o.internal.*;
25: import com.db4o.internal.freespace.*;
26:
27: /**
28: * A node to represent an entry removed from an Index
29: */
30: public class IxRemove extends IxPatch {
31:
32: public IxRemove(IndexTransaction a_ft, int a_parentID,
33: Object a_value) {
34: super (a_ft, a_parentID, a_value);
35: _size = 0;
36: }
37:
38: public int ownSize() {
39: return 0;
40: }
41:
42: public String toString() {
43: String str = "IxRemove "
44: + _parentID
45: + "\n "
46: + IxDeprecationHelper.comparableObject(handler(),
47: trans(), _value);
48:
49: return str;
50: }
51:
52: public void freespaceVisit(FreespaceVisitor visitor, int index) {
53: // do nothing
54: }
55:
56: public void visit(Object obj) {
57: // do nothing
58: }
59:
60: public void visit(Visitor4 visitor, int[] lowerAndUpperMatch) {
61: // do nothing
62: }
63:
64: public int write(Indexable4 a_handler, StatefulBuffer a_writer) {
65: // do nothing
66: return 0;
67: }
68:
69: public void visitAll(IntObjectVisitor visitor) {
70: // do nothing
71: }
72:
73: public Object shallowClone() {
74: IxRemove remove = new IxRemove(_fieldTransaction, _parentID,
75: _value);
76: super.shallowCloneInternal(remove);
77: return remove;
78: }
79: }
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