oracle.toplink.essentials.internal.parsing.SizeNode Maven / Gradle / Ivy
/*
* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the "License"). You may not use this file except
* in compliance with the License.
*
* You can obtain a copy of the license at
* glassfish/bootstrap/legal/CDDLv1.0.txt or
* https://glassfish.dev.java.net/public/CDDLv1.0.html.
* See the License for the specific language governing
* permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* HEADER in each file and include the License file at
* glassfish/bootstrap/legal/CDDLv1.0.txt. If applicable,
* add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your
* own identifying information: Portions Copyright [yyyy]
* [name of copyright owner]
*/
// Copyright (c) 1998, 2007, Oracle. All rights reserved.
package oracle.toplink.essentials.internal.parsing;
import oracle.toplink.essentials.expressions.*;
import oracle.toplink.essentials.exceptions.EJBQLException;
/**
* INTERNAL
* Purpose: Represent a SIZE function
*
Responsibilities:
* - Generate the correct expression for SIZE
*
*/
public class SizeNode extends ArithmeticFunctionNode {
/**
* Return a new SizeNode.
*/
public SizeNode() {
super();
}
/**
* INTERNAL
* Validate node and calculate its type.
*/
public void validate(ParseTreeContext context) {
if (left != null) {
left.validate(context);
}
TypeHelper typeHelper = context.getTypeHelper();
setType(typeHelper.getIntType());
}
/**
* INTERNAL
* Generate the TopLink expression for this node
*/
public Expression generateExpression(GenerationContext context) {
DotNode dotNode = (DotNode)getLeft();
Node prefix = dotNode.getLeft();
String variableName = ((AttributeNode)dotNode.getRight()).getAttributeName();
// check whether variable denotes a collection valued field
if (!dotNode.endsWithCollectionField(context)) {
throw EJBQLException.invalidSizeArgument(
context.getParseTreeContext().getQueryInfo(),
getLine(), getColumn(), variableName);
}
Expression whereClause = prefix.generateExpression(context);
whereClause = whereClause.size(variableName);
return whereClause;
}
}