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.Collection;
public class EnumEvalMaxBy extends EnumEvalBase implements EnumEval {
public EnumEvalMaxBy(ExprEvaluator innerExpression, int streamCountIncoming) {
super(innerExpression, streamCountIncoming);
}
public Object evaluateEnumMethod(Collection target, boolean isNewData, ExprEvaluatorContext context) {
Comparable maxKey = null;
EventBean result = null;
Collection<EventBean> beans = (Collection<EventBean>) target;
for (EventBean next : beans) {
eventsLambda[streamNumLambda] = next;
Object comparable = innerExpression.evaluate(eventsLambda, isNewData, context);
if (comparable == null) {
continue;
}
if (maxKey == null) {
maxKey = (Comparable) comparable;
result = next;
}
else {
if (maxKey.compareTo(comparable) < 0) {
maxKey = (Comparable) comparable;
result = next;
}
}
}
return result; // unpack of EventBean to underlying performed at another stage
}
}