SupportAggregator.java

/*
 ***************************************************************************************
 *  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.supportregression.epl;

import com.espertech.esper.epl.agg.aggregator.AggregationMethod;
import com.espertech.esper.epl.core.EngineImportService;

public class SupportAggregator implements AggregationMethod
{
    private int sum;

    public void clear()
    {
        
    }

    public void enter(Object value)
    {
        if (value != null)
        {
            sum += (Integer) value;
        }
    }

    public void leave(Object value)
    {
        if (value != null)
        {
            sum -= (Integer) value;
        }
    }

    public Object getValue()
    {
        return sum;
    }

    public AggregationMethod newAggregator(EngineImportService engineImportService)
    {
        return new SupportAggregator();
    }

    public String getFunctionName() {
        return "supportagg";
    }
}