/*
***************************************************************************************
* 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;
/**
* Median projection (aggregation) in the distinct and regular form.
*/
public class MedianProjectionExpression extends ExpressionBase {
private boolean distinct;
private static final long serialVersionUID = 4859634868887801690L;
/**
* Ctor.
*/
public MedianProjectionExpression() {
}
/**
* Ctor - for use to create an expression tree, without inner expression
*
* @param isDistinct true if distinct
*/
public MedianProjectionExpression(boolean isDistinct) {
this.distinct = isDistinct;
}
/**
* Ctor - adds the expression to project.
*
* @param expression returning values to project
* @param isDistinct true if distinct
*/
public MedianProjectionExpression(Expression expression, boolean isDistinct) {
this.distinct = isDistinct;
this.getChildren().add(expression);
}
public ExpressionPrecedenceEnum getPrecedence() {
return ExpressionPrecedenceEnum.UNARY;
}
public void toPrecedenceFreeEPL(StringWriter writer) {
ExpressionBase.renderAggregation(writer, "median", distinct, this.getChildren());
}
/**
* Returns true if the projection considers distinct values only.
*
* @return true if distinct
*/
public boolean isDistinct() {
return distinct;
}
/**
* Returns true if the projection considers distinct values only.
*
* @return true if distinct
*/
public boolean getDistinct() {
return distinct;
}
/**
* Set the distinct flag indicating the projection considers distinct values only.
*
* @param distinct true for distinct, false for not distinct
*/
public void setDistinct(boolean distinct) {
this.distinct = distinct;
}
}