/*
 ***************************************************************************************
 *  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.service;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.agg.aggregator.AggregationMethod;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;

import java.util.Collection;

/**
 * Implements an aggregation service for match recognize.
 */
public class AggregationServiceMatchRecognizeImpl implements AggregationServiceMatchRecognize {
    private ExprEvaluator[][] evaluatorsEachStream;
    private AggregationMethod[][] aggregatorsEachStream;
    private AggregationMethod[] aggregatorsAll;

    public AggregationServiceMatchRecognizeImpl(ExprEvaluator[][] evaluatorsEachStream, AggregationMethod[][] aggregatorsEachStream, AggregationMethod[] aggregatorsAll) {
        this.evaluatorsEachStream = evaluatorsEachStream;
        this.aggregatorsEachStream = aggregatorsEachStream;
        this.aggregatorsAll = aggregatorsAll;
    }

    public void applyEnter(EventBean[] eventsPerStream, int streamId, ExprEvaluatorContext exprEvaluatorContext) {

        ExprEvaluator[] evaluatorsStream = evaluatorsEachStream[streamId];
        if (evaluatorsStream == null) {
            return;
        }

        AggregationMethod[] aggregatorsStream = aggregatorsEachStream[streamId];
        for (int j = 0; j < evaluatorsStream.length; j++) {
            Object columnResult = evaluatorsStream[j].evaluate(eventsPerStream, true, exprEvaluatorContext);
            aggregatorsStream[j].enter(columnResult);
        }
    }

    public Object getValue(int column, int agentInstanceId, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) {
        return aggregatorsAll[column].getValue();
    }

    public Collection<EventBean> getCollectionOfEvents(int column, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context) {
        return null;
    }

    public Collection<Object> getCollectionScalar(int column, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context) {
        return null;
    }

    public EventBean getEventBean(int column, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context) {
        return null;
    }

    public void clearResults() {
        for (AggregationMethod aggregator : aggregatorsAll) {
            aggregator.clear();
        }
    }

    public Object getGroupKey(int agentInstanceId) {
        return null;
    }

    public Collection<Object> getGroupKeys(ExprEvaluatorContext exprEvaluatorContext) {
        return null;
    }
}