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

Go to download
/*
 ***************************************************************************************
 *  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.enummethod.eval;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.expression.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.event.arr.ObjectArrayEventBean;
import com.espertech.esper.event.arr.ObjectArrayEventType;

import java.util.ArrayDeque;
import java.util.Collection;
import java.util.Collections;

public class EnumEvalTakeWhileIndexEvents implements EnumEval {

    private ExprEvaluator innerExpression;
    private int streamNumLambda;
    private ObjectArrayEventType indexEventType;

    public EnumEvalTakeWhileIndexEvents(ExprEvaluator innerExpression, int streamNumLambda, ObjectArrayEventType indexEventType) {
        this.innerExpression = innerExpression;
        this.streamNumLambda = streamNumLambda;
        this.indexEventType = indexEventType;
    }

    public int getStreamNumSize() {
        return streamNumLambda + 2;
    }

    public Object evaluateEnumMethod(EventBean[] eventsLambda, Collection target, boolean isNewData, ExprEvaluatorContext context) {
        if (target.isEmpty()) {
            return target;
        }

        ObjectArrayEventBean indexEvent = new ObjectArrayEventBean(new Object[1], indexEventType);

        Collection beans = (Collection) target;
        if (target.size() == 1) {
            EventBean item = beans.iterator().next();
            indexEvent.getProperties()[0] = 0;
            eventsLambda[streamNumLambda] = item;
            eventsLambda[streamNumLambda + 1] = indexEvent;

            Object pass = innerExpression.evaluate(eventsLambda, isNewData, context);
            if (pass == null || (!(Boolean) pass)) {
                return Collections.emptyList();
            }
            return Collections.singletonList(item);
        }

        ArrayDeque