com.espertech.esper.epl.agg.factory.AggregationMethodFactoryCountEver Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of esper Show documentation
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.agg.factory;

import com.espertech.esper.client.EventType;
import com.espertech.esper.epl.agg.access.AggregationAccessor;
import com.espertech.esper.epl.agg.access.AggregationAgent;
import com.espertech.esper.epl.agg.access.AggregationStateKey;
import com.espertech.esper.epl.agg.aggregator.*;
import com.espertech.esper.epl.agg.service.AggregationMethodFactory;
import com.espertech.esper.epl.agg.service.AggregationValidationUtil;
import com.espertech.esper.epl.agg.service.AggregationStateFactory;
import com.espertech.esper.epl.expression.baseagg.ExprAggregateNodeBase;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprValidationException;
import com.espertech.esper.epl.expression.methodagg.ExprCountEverNode;
import com.espertech.esper.epl.expression.methodagg.ExprMethodAggUtil;

public class AggregationMethodFactoryCountEver implements AggregationMethodFactory {
    protected final ExprCountEverNode parent;
    protected final boolean ignoreNulls;

    public AggregationMethodFactoryCountEver(ExprCountEverNode parent, boolean ignoreNulls) {
        this.parent = parent;
        this.ignoreNulls = ignoreNulls;
    }

    public boolean isAccessAggregation() {
        return false;
    }

    public Class getResultType() {
        return long.class;
    }

    public AggregationStateKey getAggregationStateKey(boolean isMatchRecognize) {
        throw new IllegalStateException("Not an access aggregation function");
    }

    public AggregationStateFactory getAggregationStateFactory(boolean isMatchRecognize) {
        throw new IllegalStateException("Not an access aggregation function");
    }

    public AggregationAccessor getAccessor() {
        throw new IllegalStateException("Not an access aggregation function");
    }

    public AggregationMethod make() {
        return makeCountEverValueAggregator(parent.hasFilter(), ignoreNulls);
    }

    public ExprAggregateNodeBase getAggregationExpression() {
        return parent;
    }

    public void validateIntoTableCompatible(AggregationMethodFactory intoTableAgg) throws ExprValidationException {
        AggregationValidationUtil.validateAggregationType(this, intoTableAgg);
        AggregationMethodFactoryCountEver that = (AggregationMethodFactoryCountEver) intoTableAgg;
        if (that.ignoreNulls != ignoreNulls) {
            throw new ExprValidationException("The aggregation declares " +
                    (ignoreNulls ? "ignore-nulls" : "no-ignore-nulls") +
                    " and provided is " +
                    (that.ignoreNulls ? "ignore-nulls" : "no-ignore-nulls"));
        }
        AggregationValidationUtil.validateAggregationFilter(parent.hasFilter(), that.parent.hasFilter());
    }

    public AggregationAgent getAggregationStateAgent() {
        return null;
    }

    public ExprEvaluator getMethodAggregationEvaluator(boolean join, EventType[] typesPerStream) throws ExprValidationException {
        return ExprMethodAggUtil.getDefaultEvaluator(parent.getPositionalParams(), join, typesPerStream);
    }

    private AggregationMethod makeCountEverValueAggregator(boolean hasFilter, boolean ignoreNulls) {
        if (!hasFilter) {
            if (ignoreNulls) {
                return new AggregatorCountEverNonNull();
            }
            return new AggregatorCountEver();
        } else {
            if (ignoreNulls) {
                return new AggregatorCountEverNonNullFilter();
            }
            return new AggregatorCountEverFilter();
        }
    }
}