/**************************************************************************************
* 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.expression;
import com.espertech.esper.client.EventBean;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.Map;
public class ExprDotEvalStreamEventBean implements ExprEvaluator
{
private static final Log log = LogFactory.getLog(ExprDotEvalStreamEventBean.class);
private final int streamNumber;
private final ExprDotEval[] evaluators;
public ExprDotEvalStreamEventBean(int streamNumber, ExprDotEval[] evaluators) {
this.streamNumber = streamNumber;
this.evaluators = evaluators;
}
public Class getType()
{
return evaluators[evaluators.length - 1].getTypeInfo().getSingleValueType();
}
public Map<String, Object> getEventType() {
return null;
}
public Object evaluate(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext)
{
EventBean theEvent = eventsPerStream[streamNumber];
if (theEvent == null) {
return null;
}
Object inner = theEvent;
for (ExprDotEval methodEval : evaluators) {
inner = methodEval.evaluate(inner, eventsPerStream, isNewData, exprEvaluatorContext);
if (inner == null) {
break;
}
}
return inner;
}
}