/*
* *************************************************************************************
* 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.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;
import java.util.LinkedHashMap;
import java.util.Map;
public class EnumEvalDistinctScalarLambda extends EnumEvalBase implements EnumEval {
private final ObjectArrayEventType resultEventType;
public EnumEvalDistinctScalarLambda(ExprEvaluator innerExpression, int streamCountIncoming, ObjectArrayEventType resultEventType) {
super(innerExpression, streamCountIncoming);
this.resultEventType = resultEventType;
}
public Object evaluateEnumMethod(EventBean[] eventsLambda, Collection target, boolean isNewData, ExprEvaluatorContext context) {
if (target == null || target.size() < 2) {
return target;
}
Map<Comparable, Object> set = new LinkedHashMap<Comparable, Object>();
ObjectArrayEventBean resultEvent = new ObjectArrayEventBean(new Object[1], resultEventType);
Collection<Object> values = (Collection<Object>) target;
for (Object next : values) {
resultEvent.getProperties()[0] = next;
eventsLambda[streamNumLambda] = resultEvent;
Comparable comparable = (Comparable) innerExpression.evaluate(eventsLambda, isNewData, context);
if (!set.containsKey(comparable)) {
set.put(comparable, next);
}
}
return set.values();
}
}