com.espertech.esper.epl.enummethod.eval.ExprDotEvalOrderByAscDesc Maven / Gradle / Ivy

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Complex event processing and event series analysis component
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/*
 * *************************************************************************************
 *  Copyright (C) 2006-2015 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.enummethod.eval;

import com.espertech.esper.client.EventType;
import com.espertech.esper.epl.core.EngineImportService;
import com.espertech.esper.epl.rettype.EPTypeHelper;
import com.espertech.esper.epl.core.StreamTypeService;
import com.espertech.esper.epl.enummethod.dot.*;
import com.espertech.esper.epl.expression.dot.ExprDotNodeUtility;
import com.espertech.esper.event.EventAdapterService;
import com.espertech.esper.event.arr.ObjectArrayEventType;

import java.util.List;

public class ExprDotEvalOrderByAscDesc extends ExprDotEvalEnumMethodBase {

    public EventType[] getAddStreamTypes(String enumMethodUsedName, List goesToNames, EventType inputEventType, Class collectionComponentType, List bodiesAndParameters, EventAdapterService eventAdapterService) {
        return ExprDotNodeUtility.getSingleLambdaParamEventType(enumMethodUsedName, goesToNames, inputEventType, collectionComponentType, eventAdapterService);
    }

    public EnumEval getEnumEval(EngineImportService engineImportService, EventAdapterService eventAdapterService, StreamTypeService streamTypeService, int statementId, String enumMethodUsedName, List bodiesAndParameters, EventType inputEventType, Class collectionComponentType, int numStreamsIncoming, boolean disablePropertyExpressionEventCollCache) {

        boolean isDescending = this.getEnumMethodEnum() == EnumMethodEnum.ORDERBYDESC;

        if (bodiesAndParameters.isEmpty()) {
            super.setTypeInfo(EPTypeHelper.collectionOfSingleValue(collectionComponentType));
            return new EnumEvalOrderByAscDescScalar(numStreamsIncoming, isDescending);
        }

        ExprDotEvalParamLambda first = (ExprDotEvalParamLambda) bodiesAndParameters.get(0);
        if (inputEventType == null) {
            super.setTypeInfo(EPTypeHelper.collectionOfSingleValue(collectionComponentType));
            return new EnumEvalOrderByAscDescScalarLambda(first.getBodyEvaluator(), first.getStreamCountIncoming(), isDescending,
                    (ObjectArrayEventType) first.getGoesToTypes()[0]);
        }
        super.setTypeInfo(EPTypeHelper.collectionOfEvents(inputEventType));
        return new EnumEvalOrderByAscDescEvents(first.getBodyEvaluator(), first.getStreamCountIncoming(), isDescending);
    }
}