/*
* *************************************************************************************
* 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.expression;
import com.espertech.esper.client.hook.AggregationFunctionFactory;
import com.espertech.esper.epl.agg.AggregationAccessor;
import com.espertech.esper.epl.agg.AggregationMethod;
import com.espertech.esper.epl.agg.AggregationMethodFactory;
import com.espertech.esper.epl.agg.AggregationSpec;
import com.espertech.esper.epl.core.MethodResolutionService;
public class ExprPlugInAggFunctionFactory implements AggregationMethodFactory
{
private final AggregationFunctionFactory aggregationFunctionFactory;
private final boolean distinct;
private final Class aggregatedValueType;
public ExprPlugInAggFunctionFactory(AggregationFunctionFactory aggregationFunctionFactory, boolean distinct, Class aggregatedValueType) {
this.aggregationFunctionFactory = aggregationFunctionFactory;
this.distinct = distinct;
this.aggregatedValueType = aggregatedValueType;
}
public Class getResultType()
{
return aggregationFunctionFactory.getValueType();
}
public AggregationSpec getSpec(boolean isMatchRecognize)
{
return null; // defaults apply
}
public AggregationAccessor getAccessor()
{
return null; // no accessor
}
public AggregationMethod make(MethodResolutionService methodResolutionService, int agentInstanceId, int groupId, int aggregationId) {
AggregationMethod method = aggregationFunctionFactory.newAggregator();
if (!distinct) {
return method;
}
return methodResolutionService.makeDistinctAggregator(agentInstanceId, groupId, aggregationId, method, aggregatedValueType,false);
}
public AggregationMethodFactory getPrototypeAggregator() {
return this;
}
}