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 FieldValue extends ComparisonOperandDescendant {
24:
25: private String _fieldName;
26:
27: private Object _tag;
28:
29: public FieldValue(ComparisonOperandAnchor root, String name) {
30: this (root, name, null);
31: }
32:
33: public FieldValue(ComparisonOperandAnchor root, String name,
34: Object tag) {
35: super (root);
36: _fieldName = name;
37: _tag = tag;
38: }
39:
40: public String fieldName() {
41: return _fieldName;
42: }
43:
44: public boolean equals(Object other) {
45: if (!super .equals(other)) {
46: return false;
47: }
48: FieldValue casted = (FieldValue) other;
49: if (_tag == null) {
50: if (casted._tag != null) {
51: return false;
52: }
53: } else {
54: if (!_tag.equals(casted._tag)) {
55: return false;
56: }
57: }
58: return _fieldName.equals(casted._fieldName);
59: }
60:
61: public int hashCode() {
62: int hash = super .hashCode() * 29 + _fieldName.hashCode();
63: if (_tag != null) {
64: hash *= 29 + _tag.hashCode();
65: }
66: return hash;
67: }
68:
69: public String toString() {
70: return super .toString() + "." + _fieldName;
71: }
72:
73: public void accept(ComparisonOperandVisitor visitor) {
74: visitor.visit(this );
75: }
76:
77: /**
78: * Code analysis specific information.
79: *
80: * This is used in the .net side to preserve Mono.Cecil references
81: * for instance.
82: */
83: public Object tag() {
84: return _tag;
85: }
86:
87: public void tag(Object value) {
88: _tag = value;
89: }
90: }
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