/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
***************************************************************************************
*/
package com.espertech.esper.client.soda;
import java.io.StringWriter;
/**
* Grouping_id-function for use with rollup, cube or grouping sets.
*/
public class GroupingIdExpression extends ExpressionBase {
private static final long serialVersionUID = 4380882281898973262L;
/**
* Ctor - for use to create an expression tree, without child expression.
* <p>
* Use add methods to add child expressions to acts upon.
*/
public GroupingIdExpression() {
}
public ExpressionPrecedenceEnum getPrecedence() {
return ExpressionPrecedenceEnum.UNARY;
}
public void toPrecedenceFreeEPL(StringWriter writer) {
toPrecedenceFreeEPL("grouping_id", this.getChildren(), writer);
}
}