01: /*
02: * $Header: /export/home/cvsroot/MyPersonalizerRepository/MyPersonalizer/Subsystems/Kernel/Sources/es/udc/mypersonalizer/kernel/model/query/ast/expr/StepExpression.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 java.util.List;
43:
44: import es.udc.mypersonalizer.kernel.util.exceptions.VisitorException;
45:
46: /**
47: * Expression representing one or more filtering steps. Used to build
48: * predicates like:
49: * <p>
50: * <code>foo[bar = 7]</code>
51: * <p>
52: * <code>foo</code> will be represented by a <code>Step</code> with a
53: * predicate made up by an <code>AND</code> expression, whose LHS is a
54: * <code>StepExpression</code>, and the RHS is a constant.
55: *
56: * @author Abel Muinho
57: * @since 1.0
58: */
59: public class StepExpression implements Expression {
60:
61: private List steps = null;
62:
63: /**
64: * Obtains the list of <code>Step</code>s referenced by this object.
65: * @return the <code>Step</code>s.
66: */
67: public List getSteps() {
68: return steps;
69: }
70:
71: /**
72: * Sets the list of <code>Step</code>s referenced by this object.
73: * @param steps the <code>Step</code>s.
74: */
75: public void setSteps(List steps) {
76: this .steps = steps;
77: }
78:
79: public Object accept(ExpressionVisitor v) throws VisitorException {
80: return v.visit(this);
81: }
82: }
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