01: /*
02: * $Header: /export/home/cvsroot/MyPersonalizerRepository/MyPersonalizer/Subsystems/Kernel/Sources/es/udc/mypersonalizer/kernel/model/query/ast/expr/RelationalExpression.java,v 1.1.1.1 2004/03/25 12:08:37 fbellas Exp $
03: * $Revision: 1.1.1.1 $
04: * $Date: 2004/03/25 12:08:37 $
05: *
06: * =============================================================================
07: *
08: * Copyright (c) 2003, The MyPersonalizer Development Group
09: * (http://www.tic.udc.es/~fbellas/mypersonalizer/index.html) at
10: * University Of A Coruņa
11: * All rights reserved.
12: *
13: * Redistribution and use in source and binary forms, with or without
14: * modification, are permitted provided that the following conditions are met:
15: *
16: * - Redistributions of source code must retain the above copyright notice,
17: * this list of conditions and the following disclaimer.
18: *
19: * - Redistributions in binary form must reproduce the above copyright notice,
20: * this list of conditions and the following disclaimer in the documentation
21: * and/or other materials provided with the distribution.
22: *
23: * - Neither the name of the University Of A Coruņa nor the names of its
24: * contributors may be used to endorse or promote products derived from
25: * this software without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
28: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30: * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
31: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37: * POSSIBILITY OF SUCH DAMAGE.
38: *
39: */
40: package es.udc.mypersonalizer.kernel.model.query.ast.expr;
41:
42: /**
43: * A binary expression which evaluates to a boolean value and whose arguments
44: * can be compared according to a given relation.
45: *
46: * @author Abel Muinho
47: * @since 1.0
48: */
49: public abstract class RelationalExpression implements BinaryExpression,
50: BooleanExpression {
51:
52: /** The left-hand side of the expression. */
53: private Expression lhs;
54:
55: /** The right-hand side of the expression. */
56: private Expression rhs;
57:
58: public Expression getLHS() {
59: return lhs;
60: }
61:
62: public void setLHS(Expression e) {
63: lhs = e;
64: }
65:
66: public Expression getRHS() {
67: return rhs;
68: }
69:
70: public void setRHS(Expression e) {
71: rhs = e;
72: }
73:
74: }
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