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


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.exceptions.EJBQLException;
25 /**
26  * INTERNAL
27  * <p><b>Purpose</b>: Represent a FETCH JOIN declaration as part of the FROM
28  * clause: FETCH JOIN o.customer.
29  * <p><b>Responsibilities</b>:<ul>
30  * <li> Manage the path node and the outer join flag of the FETCH JOIN clause.
31  * </ul>
32  */
33 public class FetchJoinNode extends Node {
34
35     private Node path;
36     private boolean outerJoin;
37
38     /** */
39     public Node getPath() {
40         return path;
41     }
42     
43     /** */
44     public void setPath(Node node) {
45         path = node;
46     }
47     
48     /** */
49     public boolean isOuterJoin() {
50         return outerJoin;
51     }
52
53     /** */
54     public void setOuterJoin(boolean outerJoin) {
55         this.outerJoin = outerJoin;
56     }
57
58     /**
59      * INTERNAL
60      * Validate node and calculate its type.
61      */
62     public void validate(ParseTreeContext context) {
63         if (path != null) {
64             path.validate(context);
65             setType(path.getType());
66
67             // join of embedded attribute is not supported.
68 if (path.isDotNode()) {
69                 TypeHelper typeHelper = context.getTypeHelper();
70                 VariableNode left = (VariableNode)path.getLeft();
71                 AttributeNode right = (AttributeNode)path.getRight();
72                 if ((left != null) && (right != null)) {
73                     if (typeHelper.isEmbeddedAttribute(left.getType(), right.getAttributeName()))
74                         throw EJBQLException.unsupportJoinArgument("Fetch Join", getType().toString());
75                 }
76             }
77         }
78     }
79 }
80
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