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Java > Open Source Codes > oracle > toplink > essentials > internal > parsing > LowerNode


1 /*
2  * The contents of this file are subject to the terms
3  * of the Common Development and Distribution License
4  * (the "License"). You may not use this file except
5  * in compliance with the License.
6  *
7  * You can obtain a copy of the license at
8  * glassfish/bootstrap/legal/CDDLv1.0.txt or
9  * https://glassfish.dev.java.net/public/CDDLv1.0.html.
10  * See the License for the specific language governing
11  * permissions and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL
14  * HEADER in each file and include the License file at
15  * glassfish/bootstrap/legal/CDDLv1.0.txt. If applicable,
16  * add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your
18  * own identifying information: Portions Copyright [yyyy]
19  * [name of copyright owner]
20  */
21 // Copyright (c) 1998, 2005, Oracle. All rights reserved.
22 package oracle.toplink.essentials.internal.parsing;
23
24 import oracle.toplink.essentials.expressions.*;
25
26 /**
27  * INTERNAL
28  * <p><b>Purpose</b>: Represent a LOWER
29  * <p><b>Responsibilities</b>:<ul>
30  * <li> Generate the correct expression for LOWER
31  * </ul>
32  */
33 public class LowerNode extends StringFunctionNode {
34
35     /**
36      * LowerNode constructor comment.
37      */
38     public LowerNode() {
39         super();
40     }
41
42     /**
43      * INTERNAL
44      * Validate node and calculate its type.
45      */
46     public void validate(ParseTreeContext context) {
47         TypeHelper typeHelper = context.getTypeHelper();
48         if (left != null) {
49             left.validate(context);
50             left.validateParameter(context, typeHelper.getStringType());
51         }
52         setType(typeHelper.getStringType());
53     }
54
55     /**
56      * INTERNAL
57      * Generate the TopLink expression for this node
58      */
59     public Expression generateExpression(GenerationContext context) {
60         Expression whereClause = getLeft().generateExpression(context);
61         whereClause = whereClause.toLowerCase();
62         return whereClause;
63     }
64     
65 }
66
67
68
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