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.ArrayDeque;
import java.util.Collection;
import java.util.Collections;
public class EnumEvalTakeWhileLastEvents extends EnumEvalBase implements EnumEval {
public EnumEvalTakeWhileLastEvents(ExprEvaluator innerExpression, int streamCountIncoming) {
super(innerExpression, streamCountIncoming);
}
public Object evaluateEnumMethod(Collection target, boolean isNewData, ExprEvaluatorContext context) {
if (target.isEmpty()) {
return target;
}
Collection<EventBean> beans = (Collection<EventBean>) target;
if (target.size() == 1) {
EventBean item = beans.iterator().next();
eventsLambda[streamNumLambda] = item;
Object pass = innerExpression.evaluate(eventsLambda, isNewData, context);
if (pass == null || (!(Boolean) pass)) {
return Collections.emptyList();
}
return Collections.singletonList(item);
}
int size = target.size();
EventBean[] all = new EventBean[size];
int count = 0;
for (EventBean item : beans) {
all[count++] = item;
}
ArrayDeque<Object> result = new ArrayDeque<Object>();
for (int i = all.length - 1; i >= 0; i--) {
eventsLambda[streamNumLambda] = all[i];
Object pass = innerExpression.evaluate(eventsLambda, isNewData, context);
if (pass == null || (!(Boolean) pass)) {
break;
}
result.addFirst(all[i]);
}
return result;
}
}