/*
***************************************************************************************
* 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.epl.agg.access;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
public class AggregationAgentRewriteStreamWFilter implements AggregationAgent {
private final int streamNum;
private final ExprEvaluator filterEval;
public AggregationAgentRewriteStreamWFilter(int streamNum, ExprEvaluator filterEval) {
this.streamNum = streamNum;
this.filterEval = filterEval;
}
public void applyEnter(EventBean[] eventsPerStream, ExprEvaluatorContext exprEvaluatorContext, AggregationState aggregationState) {
Boolean pass = (Boolean) filterEval.evaluate(eventsPerStream, true, exprEvaluatorContext);
if (pass != null && pass) {
EventBean[] rewrite = new EventBean[]{eventsPerStream[streamNum]};
aggregationState.applyEnter(rewrite, exprEvaluatorContext);
}
}
public void applyLeave(EventBean[] eventsPerStream, ExprEvaluatorContext exprEvaluatorContext, AggregationState aggregationState) {
Boolean pass = (Boolean) filterEval.evaluate(eventsPerStream, false, exprEvaluatorContext);
if (pass != null && pass) {
EventBean[] rewrite = new EventBean[]{eventsPerStream[streamNum]};
aggregationState.applyLeave(rewrite, exprEvaluatorContext);
}
}
}