/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* 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.epl.agg.aggregator;
/**
* Aggregator for the very first value.
*/
public class AggregatorFirstEver implements AggregationMethod
{
protected final Class type;
protected boolean isSet;
protected Object firstValue;
/**
* Ctor.
* @param type type of value returned
*/
public AggregatorFirstEver(Class type) {
this.type = type;
}
public void clear()
{
firstValue = null;
isSet = false;
}
public void enter(Object object)
{
if (!isSet)
{
isSet = true;
firstValue = object;
}
}
public void leave(Object object)
{
}
public Object getValue()
{
return firstValue;
}
public Class getValueType()
{
return type;
}
public boolean isSet() {
return isSet;
}
public void setSet(boolean set) {
isSet = set;
}
public Object getFirstValue() {
return firstValue;
}
public void setFirstValue(Object firstValue) {
this.firstValue = firstValue;
}
}