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:
38: package oracle.toplink.essentials.internal.parsing;
39:
40: import oracle.toplink.essentials.expressions.*;
41: import oracle.toplink.essentials.exceptions.EJBQLException;
42:
43: /**
44: * INTERNAL
45: * <p><b>Purpose</b>: Represent a SIZE function
46: * <p><b>Responsibilities</b>:<ul>
47: * <li> Generate the correct expression for SIZE
48: * </ul>
49: */
50: public class SizeNode extends ArithmeticFunctionNode {
51:
52: /**
53: * Return a new SizeNode.
54: */
55: public SizeNode() {
56: super ();
57: }
58:
59: /**
60: * INTERNAL
61: * Validate node and calculate its type.
62: */
63: public void validate(ParseTreeContext context) {
64: if (left != null) {
65: left.validate(context);
66: }
67: TypeHelper typeHelper = context.getTypeHelper();
68: setType(typeHelper.getIntType());
69: }
70:
71: /**
72: * INTERNAL
73: * Generate the TopLink expression for this node
74: */
75: public Expression generateExpression(GenerationContext context) {
76: DotNode dotNode = (DotNode) getLeft();
77: Node prefix = dotNode.getLeft();
78: String variableName = ((AttributeNode) dotNode.getRight())
79: .getAttributeName();
80:
81: // check whether variable denotes a collection valued field
82: if (!dotNode.endsWithCollectionField(context)) {
83: throw EJBQLException.invalidSizeArgument(context
84: .getParseTreeContext().getQueryInfo(), getLine(),
85: getColumn(), variableName);
86: }
87: Expression whereClause = prefix.generateExpression(context);
88: whereClause = whereClause.size(variableName);
89: return whereClause;
90: }
91:
92: }
|