/******************************************************************************* | |
* Copyright (c) 1998, 2013 Oracle and/or its affiliates. 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.internal.expressions.ConstantExpression; | |
/** | |
* INTERNAL | |
* <p><b>Purpose</b>: Represent an unary '-' in EJBQL | |
* <p><b>Responsibilities</b>:<ul> | |
* <li> Generate the correct expression for an unary '-' | |
* </ul> | |
*/ | |
public class UnaryMinus extends Node { | |
public UnaryMinus() { | |
super(); | |
} | |
/** | |
* INTERNAL | |
* Validate node and calculate its type. | |
*/ | |
public void validate(ParseTreeContext context) { | |
if (left != null) { | |
left.validate(context); | |
setType(left.getType()); | |
} | |
} | |
/** | |
* INTERNAL | |
*/ | |
public void validateParameter(ParseTreeContext context, Object contextType) { | |
// delegate to the argument node | |
left.validateParameter(context, contextType); | |
} | |
/** | |
* INTERNAL | |
* Generate the expression. | |
*/ | |
public Expression generateExpression(GenerationContext context) { | |
Expression whereClause = new ConstantExpression(Integer.valueOf(0), new ExpressionBuilder()); | |
whereClause = ExpressionMath.subtract(whereClause, getLeft().generateExpression(context)); | |
return whereClause; | |
} | |
} |