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/*
 * 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; } }




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