com.espertech.esper.epl.approx.CountMinSketchAggAccessorFrequency Maven / Gradle / Ivy

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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.approx;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.agg.access.AggregationAccessor;
import com.espertech.esper.epl.agg.access.AggregationState;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;

import java.util.Collection;

public class CountMinSketchAggAccessorFrequency implements AggregationAccessor {

    private final ExprEvaluator evaluator;

    public CountMinSketchAggAccessorFrequency(ExprEvaluator evaluator) {
        this.evaluator = evaluator;
    }

    public Object getValue(AggregationState aggregationState, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) {
        Object value = evaluator.evaluate(eventsPerStream, true, exprEvaluatorContext);
        CountMinSketchAggState state = (CountMinSketchAggState) aggregationState;
        return state.frequency(value);
    }

    public Collection getEnumerableEvents(AggregationState state, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) {
        return null;
    }

    public EventBean getEnumerableEvent(AggregationState state, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) {
        return null;
    }

    public Collection