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Java > Open Source Codes > com > db4o > nativequery > expr > cmp > FieldValue


1 /* Copyright (C) 2004 - 2006 db4objects Inc. http://www.db4o.com
2
3 This file is part of the db4o open source object database.
4
5 db4o is free software; you can redistribute it and/or modify it under
6 the terms of version 2 of the GNU General Public License as published
7 by the Free Software Foundation and as clarified by db4objects' GPL
8 interpretation policy, available at
9 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;
22
23
24 public class FieldValue extends ComparisonOperandDescendant {
25     
26     private String JavaDoc _fieldName;
27     
28     private Object JavaDoc _tag;
29     
30     public FieldValue(ComparisonOperandAnchor root, String JavaDoc name) {
31         this(root, name, null);
32     }
33     
34     public FieldValue(ComparisonOperandAnchor root, String JavaDoc name, Object JavaDoc tag) {
35         super(root);
36         _fieldName=name;
37         _tag=tag;
38     }
39
40     public String JavaDoc fieldName() {
41         return _fieldName;
42     }
43     
44     public boolean equals(Object JavaDoc 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         }
54         else {
55             if(!_tag.equals(casted._tag)) {
56                 return false;
57             }
58         }
59         return _fieldName.equals(casted._fieldName);
60     }
61     
62     public int hashCode() {
63         int hash=super.hashCode()*29+_fieldName.hashCode();
64         if(_tag!=null) {
65             hash*=29+_tag.hashCode();
66         }
67         return hash;
68     }
69     
70     public String JavaDoc toString() {
71         return super.toString()+"."+_fieldName;
72     }
73     
74     public void accept(ComparisonOperandVisitor visitor) {
75         visitor.visit(this);
76     }
77     
78     /**
79      * Code analysis specific information.
80      *
81      * This is used in the .net side to preserve Mono.Cecil references
82      * for instance.
83      */

84     public Object JavaDoc tag() {
85         return _tag;
86     }
87     
88     public void tag(Object JavaDoc value) {
89         _tag = value;
90     }
91 }
92
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