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


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.Expression;
25
26 /**
27  * INTERNAL
28  * <p><b>Purpose</b>: Represent a WHERE
29  * <p><b>Responsibilities</b>:<ul>
30  * <li> Apply this where clause to a query
31  * </ul>
32  * @author Jon Driscoll
33  * @since TopLink 5.0
34  */
35 public class WhereNode extends MajorNode {
36
37     /**
38      * INTERNAL
39      * Validate node and calculate its type.
40      */
41     public void validate(ParseTreeContext context) {
42         if (left != null) {
43             left.validate(context);
44             TypeHelper typeHelper = context.getTypeHelper();
45             setType(typeHelper.getBooleanType());
46         }
47     }
48
49     /**
50      * INTERNAL
51      * @param context The generation context
52      * @return A TopLink expression
53      */
54     public Expression generateExpression(GenerationContext context) {
55         Expression whereClause = null;
56         if (getLeft() != null) {
57             whereClause = getLeft().generateExpression(context);
58         }
59         return whereClause;
60     }
61
62 }
63
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