/**************************************************************************************
* 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.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 ExprSumNodeFactory implements AggregationMethodFactory
{
private final Class resultType;
private final Class inputValueType;
private final boolean isDistinct;
private final boolean hasFilter;
public ExprSumNodeFactory(MethodResolutionService methodResolutionService, Class inputValueType, boolean isDistinct, boolean hasFilter)
{
this.inputValueType = inputValueType;
this.isDistinct = isDistinct;
this.resultType = methodResolutionService.getSumAggregatorType(inputValueType);
this.hasFilter = hasFilter;
}
public AggregationSpec getSpec(boolean isMatchRecognize)
{
return null; // default spec
}
public Class getResultType()
{
return resultType;
}
public AggregationAccessor getAccessor()
{
throw new UnsupportedOperationException();
}
public AggregationMethod make(MethodResolutionService methodResolutionService, int[] agentInstanceIds, int groupId, int aggregationId) {
AggregationMethod method = methodResolutionService.makeSumAggregator(agentInstanceIds, groupId, aggregationId, inputValueType, hasFilter);
if (!isDistinct) {
return method;
}
return methodResolutionService.makeDistinctAggregator(agentInstanceIds, groupId, aggregationId, method, inputValueType, hasFilter);
}
public AggregationMethodFactory getPrototypeAggregator() {
return this;
}
}