/*
***************************************************************************************
* 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.example.runtimeconfig;
import com.espertech.esper.client.hook.AggregationFunctionFactory;
import com.espertech.esper.epl.agg.aggregator.AggregationMethod;
import com.espertech.esper.epl.agg.service.AggregationValidationContext;
public class MyConcatAggregationFunctionFactory implements AggregationFunctionFactory {
public void validate(AggregationValidationContext validationContext) {
if ((validationContext.getParameterTypes().length != 1) ||
(validationContext.getParameterTypes()[0] != String.class)) {
throw new IllegalArgumentException("Concat aggregation requires a single parameter of type String");
}
}
public Class getValueType() {
return String.class;
}
public void setFunctionName(String functionName) {
// not required here
}
public AggregationMethod newAggregator() {
return new MyConcatAggregationFunction();
}
}