KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > db4o > nativequery > expr > BoolConstExpression


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;
22
23
24 public class BoolConstExpression implements Expression {
25     public static final BoolConstExpression TRUE=new BoolConstExpression(true);
26     public static final BoolConstExpression FALSE=new BoolConstExpression(false);
27
28     private boolean _value;
29     
30     private BoolConstExpression(boolean value) {
31         this._value=value;
32     }
33     
34     public boolean value() {
35         return _value;
36     }
37     
38     public String JavaDoc toString() {
39         return String.valueOf(_value);
40     }
41     
42     public static BoolConstExpression expr(boolean value) {
43         return (value ? TRUE : FALSE);
44     }
45
46     public void accept(ExpressionVisitor visitor) {
47         visitor.visit(this);
48     }
49
50     public Expression negate() {
51         return (_value ? FALSE : TRUE);
52     }
53 }
54
Popular Tags