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.nativequery.expr.cmp.operand;
22:
23: public class ConstValue implements ComparisonOperand {
24: private Object _value;
25:
26: public ConstValue(Object value) {
27: this ._value = value;
28: }
29:
30: public Object value() {
31: return _value;
32: }
33:
34: public void value(Object value) {
35: _value = value;
36: }
37:
38: public String toString() {
39: if (_value == null)
40: return "null";
41: if (_value instanceof String)
42: return "\"" + _value + "\"";
43: return _value.toString();
44: }
45:
46: public boolean equals(Object other) {
47: if (this == other) {
48: return true;
49: }
50: if (other == null || getClass() != other.getClass()) {
51: return false;
52: }
53: Object otherValue = ((ConstValue) other)._value;
54: if (otherValue == _value) {
55: return true;
56: }
57: if (otherValue == null || _value == null) {
58: return false;
59: }
60: return _value.equals(otherValue);
61: }
62:
63: public int hashCode() {
64: return _value.hashCode();
65: }
66:
67: public void accept(ComparisonOperandVisitor visitor) {
68: visitor.visit(this);
69: }
70: }
|