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

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Complex event processing and event series analysis component

There is a newer version: 7.1.0

package com.espertech.esper.epl.enummethod.eval;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.expression.ExprEvaluator;
import com.espertech.esper.epl.expression.ExprEvaluatorContext;

import java.util.*;

public class EnumEvalOrderByAscDescEvents extends EnumEvalBase implements EnumEval {

    private final boolean descending;

    public EnumEvalOrderByAscDescEvents(ExprEvaluator innerExpression, int streamCountIncoming, boolean descending) {
        super(innerExpression, streamCountIncoming);
        this.descending = descending;
    }

    public Object evaluateEnumMethod(Collection target, boolean isNewData, ExprEvaluatorContext context) {
        TreeMap sort = new TreeMap();
        boolean hasColl = false;

        Collection beans = (Collection) target;
        for (EventBean next : beans) {
            eventsLambda[streamNumLambda] = next;

            Comparable comparable = (Comparable) innerExpression.evaluate(eventsLambda, isNewData, context);
            Object entry = sort.get(comparable);

            if (entry == null) {
                sort.put(comparable, next);
                continue;
            }

            if (entry instanceof Collection) {
                ((Collection) entry).add(next);
                continue;
            }

            Deque