01: /*
02: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
03: *
04: * // Copyright (c) 1998, 2007, Oracle. All rights reserved.
05: *
06: *
07: * The contents of this file are subject to the terms of either the GNU
08: * General Public License Version 2 only ("GPL") or the Common Development
09: * and Distribution License("CDDL") (collectively, the "License"). You
10: * may not use this file except in compliance with the License. You can obtain
11: * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
12: * or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
13: * language governing permissions and limitations under the License.
14: *
15: * When distributing the software, include this License Header Notice in each
16: * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
17: * Sun designates this particular file as subject to the "Classpath" exception
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19: * accompanied this code. If applicable, add the following below the License
20: * Header, with the fields enclosed by brackets [] replaced by your own
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25: *
26: * If you wish your version of this file to be governed by only the CDDL or
27: * only the GPL Version 2, indicate your decision by adding "[Contributor]
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29: * Version 2] license." If you don't indicate a single choice of license, a
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33: * and therefore, elected the GPL Version 2 license, then the option applies
34: * only if the new code is made subject to such option by the copyright
35: * holder.
36: */
37: package oracle.toplink.essentials.internal.parsing;
38:
39: /**
40: * INTERNAL
41: * <p><b>Purpose</b>: Represent a Sort Direction for an
42: * Order By Item
43: * <p><b>Responsibilities</b>:<ul>
44: * <li> Apply itself to a query correctly
45: *
46: * This node represents either an ASC or DESC encountered on the input stream
47: * e.g SELECT ... FROM ... WHERE ... ORDER BY emp.salary ASC
48: * </ul>
49: * @author Jon Driscoll
50: * @since TopLink 5.0
51: */
52: import oracle.toplink.essentials.expressions.Expression;
53: import oracle.toplink.essentials.expressions.ExpressionOperator;
54:
55: public class SortDirectionNode extends Node {
56: private int sortDirection = ExpressionOperator.Ascending;
57:
58: /**
59: * INTERNAL
60: * Return the parent expression unmodified
61: */
62: public Expression addToExpression(Expression parentExpression,
63: GenerationContext context) {
64: return parentExpression.getFunction(getSortDirection());
65: }
66:
67: public void useAscending() {
68: setSortDirection(ExpressionOperator.Ascending);
69: }
70:
71: public void useDescending() {
72: setSortDirection(ExpressionOperator.Descending);
73: }
74:
75: // Accessors
76: public int getSortDirection() {
77: return sortDirection;
78: }
79:
80: public void setSortDirection(int sortDirection) {
81: this.sortDirection = sortDirection;
82: }
83: }
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