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: /**
24: * Composite key for field indexes, first compares on the actual
25: * indexed field _value and then on the _parentID (which is a
26: * reference to the containing object).
27: *
28: * @exclude
29: */
30: public class FieldIndexKey {
31:
32: private final Object _value;
33:
34: private final int _parentID;
35:
36: public FieldIndexKey(int parentID, Object value) {
37: _parentID = parentID;
38: _value = value;
39: }
40:
41: public int parentID() {
42: return _parentID;
43: }
44:
45: public Object value() {
46: return _value;
47: }
48:
49: public String toString() {
50: return "FieldIndexKey(" + _parentID + ", " + safeString(_value)
51: + ")";
52: }
53:
54: private String safeString(Object value) {
55: if (null == value) {
56: return "null";
57: }
58: return value.toString();
59: }
60: }
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