com.espertech.esper.epl.expression.subquery.SubselectEvalStrategyNREqualsInAggregated Maven / Gradle / Ivy

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Complex event processing and event series analysis component

There is a newer version: 7.1.0

/*
 ***************************************************************************************
 *  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.AggregationService;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.util.SimpleNumberCoercer;

import java.util.Collection;

/**
 * Represents a in-subselect evaluation strategy.
 */
public class SubselectEvalStrategyNREqualsInAggregated extends SubselectEvalStrategyNREqualsInBase {

    private final ExprEvaluator havingEval;

    public SubselectEvalStrategyNREqualsInAggregated(ExprEvaluator valueEval, ExprEvaluator selectEval, boolean notIn, SimpleNumberCoercer coercer, ExprEvaluator havingEval) {
        super(valueEval, selectEval, notIn, coercer);
        this.havingEval = havingEval;
    }

    protected Object evaluateInternal(Object leftResult, EventBean[] events, boolean isNewData, Collection matchingEvents, ExprEvaluatorContext exprEvaluatorContext, AggregationService aggregationService) {
        if (leftResult == null) {
            return null;
        }

        if (havingEval != null) {
            Boolean pass = (Boolean) havingEval.evaluate(events, true, exprEvaluatorContext);
            if ((pass == null) || (!pass)) {
                return null;
            }
        }

        Object rightResult = selectEval.evaluate(events, true, exprEvaluatorContext);
        if (rightResult == null) {
            return null;
        }

        if (coercer == null) {
            if (leftResult.equals(rightResult)) {
                return !isNotIn;
            }
        } else {
            Number left = coercer.coerceBoxed((Number) leftResult);
            Number right = coercer.coerceBoxed((Number) rightResult);
            if (left.equals(right)) {
                return !isNotIn;
            }
        }
        return isNotIn;
    }
}