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Complex event processing and event series analysis component

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/*
 ***************************************************************************************
 *  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.expression.subquery;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.agg.service.common.AggregationService;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.type.RelationalOpEnum;

import java.util.Collection;

public class SubselectEvalStrategyNRRelOpAllAnyAggregated extends SubselectEvalStrategyNRRelOpBase {
    private final ExprEvaluator havingEval;

    public SubselectEvalStrategyNRRelOpAllAnyAggregated(ExprEvaluator valueEval, ExprEvaluator selectEval, boolean resultWhenNoMatchingEvents, RelationalOpEnum.Computer computer, ExprEvaluator havingEval) {
        super(valueEval, selectEval, resultWhenNoMatchingEvents, computer);
        this.havingEval = havingEval;
    }

    protected Object evaluateInternal(Object leftResult, EventBean[] events, boolean isNewData, Collection matchingEvents, ExprEvaluatorContext exprEvaluatorContext, AggregationService aggregationService) {
        if (havingEval != null) {
            Boolean pass = (Boolean) havingEval.evaluate(events, true, exprEvaluatorContext);
            if ((pass == null) || (!pass)) {
                return null;
            }
        }
        Object valueRight = selectEval.evaluate(events, true, exprEvaluatorContext);
        if (valueRight == null) {
            return null;
        }
        return computer.compare(leftResult, valueRight);
    }
}