/*******************************************************************************
* Copyright (c) 1998, 2011 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.internal.jpa.parsing;
import org.eclipse.persistence.expressions.*;
import org.eclipse.persistence.queries.ObjectLevelReadQuery;
import org.eclipse.persistence.queries.ReportQuery;
/**
* INTERNAL
* <p><b>Purpose</b>: Represent a '+' in EJBQL
* <p><b>Responsibilities</b>:<ul>
* <li> Generate the correct expression for a '+'
* </ul>
* @author Jon Driscoll and Joel Lucuik
* @since July 2003
*/
public class PlusNode extends BinaryOperatorNode {
public PlusNode() {
super();
}
/**
* INTERNAL
* Apply this node to the passed query
*/
public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext context) {
if (theQuery.isReportQuery()) {
ReportQuery reportQuery = (ReportQuery)theQuery;
reportQuery.addAttribute("plus", generateExpression(context), (Class)getType());
}
}
/**
* INTERNAL
* Validate node and calculates its type.
*/
public void validate(ParseTreeContext context) {
super.validate(context);
if ((left != null) && (right != null)) {
TypeHelper typeHelper = context.getTypeHelper();
setType(typeHelper.extendedBinaryNumericPromotion(
left.getType(), right.getType()));
}
}
/**
* INTERNAL
* Generate the expression. The steps are:
* 1. Generate the expression for the left node
* 2. Add the .plus to the where clause returned from step 1
* 3. Generate the expression for the right side and use it as the parameter for the .plus()
* 4. Return the completed where clause to the caller
*/
public Expression generateExpression(GenerationContext context) {
Expression whereClause = getLeft().generateExpression(context);
whereClause = ExpressionMath.add(whereClause, getRight().generateExpression(context));
return whereClause;
}
public boolean isPlusNode() {
return true;
}
}