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
18: * as provided by Sun in the GPL Version 2 section of the License file that
19: * accompanied this code. If applicable, add the following below the License
20: * Header, with the fields enclosed by brackets [] replaced by your own
21: * identifying information: "Portions Copyrighted [year]
22: * [name of copyright owner]"
23: *
24: * Contributor(s):
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]
28: * elects to include this software in this distribution under the [CDDL or GPL
29: * Version 2] license." If you don't indicate a single choice of license, a
30: * recipient has the option to distribute your version of this file under
31: * either the CDDL, the GPL Version 2 or to extend the choice of license to
32: * its licensees as provided above. However, if you add GPL Version 2 code
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: import java.util.*;
40:
41: /**
42: * INTERNAL
43: * <p><b>Purpose</b>: Represent a FROM
44: * <p><b>Responsibilities</b>:<ul>
45: * <li> Determines the context for the Parse Tree
46: * <li> Determine the reference class for a query
47: * <li> Handle any FROM ... IN clauses
48: * </ul>
49: * @author Jon Driscoll
50: * @since TopLink 5.0
51: */
52: public class FromNode extends MajorNode {
53:
54: private List declarations;
55:
56: public String getFirstVariable() {
57: String variable = null;
58: if ((declarations != null) && (declarations.size() > 0)) {
59: variable = ((IdentificationVariableDeclNode) declarations
60: .get(0)).getCanonicalVariableName();
61: }
62: return variable;
63: }
64:
65: public List getDeclarations() {
66: return declarations;
67: }
68:
69: public void setDeclarations(List decls) {
70: declarations = decls;
71: }
72:
73: /**
74: * INTERNAL
75: * Check the declaration nodes for a path expression starting with a
76: * unqualified field access and if so, replace it by a qualified field
77: * access.
78: */
79: public Node qualifyAttributeAccess(ParseTreeContext context) {
80: for (int i = 0; i < declarations.size(); i++) {
81: Node decl = (Node) declarations.get(i);
82: declarations.set(i, decl.qualifyAttributeAccess(context));
83: }
84: return this ;
85: }
86:
87: /**
88: * INTERNAL
89: * Validate the current node.
90: */
91: public void validate(ParseTreeContext context) {
92: for (Iterator i = declarations.iterator(); i.hasNext();) {
93: Node decl = (Node) i.next();
94: decl.validate(context);
95: }
96: }
97: }
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