01: /*
02: * $Header: /export/home/cvsroot/MyPersonalizerRepository/MyPersonalizer/Subsystems/Kernel/Sources/es/udc/mypersonalizer/kernel/model/query/ast/expr/PropertyListExpression.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.ArrayList;
43: import java.util.List;
44:
45: import es.udc.mypersonalizer.kernel.util.exceptions.VisitorException;
46:
47: /**
48: * Concrete class representing an expression which evaluates to a list
49: * of <code>Property</code> objects.
50: * <p>
51: * This class provides the functionality to bridge data between different
52: * query engines/persistence types. For example, a query could be divided
53: * in several fragments (one per persistence type affected), which would be
54: * resolved from last to first. Each query executor will return it's data
55: * as a <code>PropertyListExpression</code>.
56: * <p>
57: * It is <b>not</b> intended to use this class to provide operations to
58: * create properties programatically in a query beyond the above described
59: * scenario.
60: *
61: * @author Abel Muinho
62: * @since 1.0
63: */
64: public class PropertyListExpression implements Expression {
65:
66: private List properties = new ArrayList();
67:
68: /**
69: * Obtains the list of properties generated by this expression.
70: * @return the list of properties.
71: */
72: public List getProperties() {
73: return properties;
74: }
75:
76: /**
77: * Sets the list of properties generated by this expression.
78: * @param properties the list of properties generated by this expression.
79: */
80: public void setProperties(List properties) {
81: this .properties = properties;
82: }
83:
84: public Object accept(ExpressionVisitor v) throws VisitorException {
85: return v.visit(this);
86: }
87:
88: }
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