01: /*
02: * $Header: /export/home/cvsroot/MyPersonalizerRepository/MyPersonalizer/Subsystems/Kernel/Sources/es/udc/mypersonalizer/kernel/model/query/ast/expr/GreaterThanExpression.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: import es.udc.mypersonalizer.kernel.util.exceptions.VisitorException;
43:
44: /**
45: * Relational expression comparing two numeric values (or StepExpressions
46: * evaluating to a numeric property) and evaluating to <code>TRUE</code> if
47: * the <code>LHS</code> is greater than the <code>RHS</code>.
48: *
49: * @author Abel Muinho
50: * @since 1.0
51: */
52: public class GreaterThanExpression extends RelationalExpression {
53:
54: public void setLHS(Expression e) {
55: if (e instanceof NumericExpression
56: || e instanceof StepExpression) {
57: super .setLHS(e);
58: } else {
59: throw new IllegalArgumentException(
60: "GreaterThan can only be"
61: + " applied to StepExpressions and NumericExpressions");
62: }
63: }
64:
65: public void setRHS(Expression e) {
66: if (e instanceof NumericExpression
67: || e instanceof StepExpression) {
68: super .setRHS(e);
69: } else {
70: throw new IllegalArgumentException(
71: "GreaterThan can only be"
72: + " applied to StepExpressions and NumericExpressions");
73: }
74: }
75:
76: public Object accept(ExpressionVisitor v) throws VisitorException {
77: return v.visit(this);
78: }
79:
80: }
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