/*
* *************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* 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.client.EventType;
import com.espertech.esper.epl.expression.ExprEvaluator;
import com.espertech.esper.epl.expression.ExprEvaluatorContext;
import com.espertech.esper.event.arr.ObjectArrayEventBean;
import com.espertech.esper.event.arr.ObjectArrayEventType;
import java.util.Collection;
public class EnumEvalMinMaxScalarLambda extends EnumEvalBase implements EnumEval {
private final boolean max;
private final ObjectArrayEventType resultEventType;
public EnumEvalMinMaxScalarLambda(ExprEvaluator innerExpression, int streamCountIncoming, boolean max, ObjectArrayEventType resultEventType) {
super(innerExpression, streamCountIncoming);
this.max = max;
this.resultEventType = resultEventType;
}
public Object evaluateEnumMethod(EventBean[] eventsLambda, Collection target, boolean isNewData, ExprEvaluatorContext context) {
Comparable minKey = null;
ObjectArrayEventBean resultEvent = new ObjectArrayEventBean(new Object[1], resultEventType);
Collection<Object> coll = (Collection<Object>) target;
for (Object next : coll) {
resultEvent.getProperties()[0] = next;
eventsLambda[streamNumLambda] = resultEvent;
Object comparable = innerExpression.evaluate(eventsLambda, isNewData, context);
if (comparable == null) {
continue;
}
if (minKey == null) {
minKey = (Comparable) comparable;
}
else {
if (max) {
if (minKey.compareTo(comparable) < 0) {
minKey = (Comparable) comparable;
}
}
else {
if (minKey.compareTo(comparable) > 0) {
minKey = (Comparable) comparable;
}
}
}
}
return minKey;
}
}