/*
* *************************************************************************************
* 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.core.eval;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventPropertyGetter;
import com.espertech.esper.client.EventType;
import com.espertech.esper.epl.core.SelectExprProcessor;
import com.espertech.esper.epl.expression.ExprEvaluator;
import com.espertech.esper.epl.expression.ExprEvaluatorContext;
import com.espertech.esper.epl.spec.SelectClauseStreamCompiledSpec;
import com.espertech.esper.event.DecoratingEventBean;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.List;
import java.util.Map;
public class EvalSelectStreamWUnderlying extends EvalSelectStreamBase implements SelectExprProcessor {
private static final Log log = LogFactory.getLog(EvalSelectStreamWUnderlying.class);
private final List<SelectExprStreamDesc> unnamedStreams;
private final boolean singleStreamWrapper;
private final boolean underlyingIsFragmentEvent;
private final int underlyingStreamNumber;
private final EventPropertyGetter underlyingPropertyEventGetter;
private final ExprEvaluator underlyingExprEvaluator;
public EvalSelectStreamWUnderlying(SelectExprContext selectExprContext,
EventType resultEventType,
List<SelectClauseStreamCompiledSpec> namedStreams,
boolean usingWildcard,
List<SelectExprStreamDesc> unnamedStreams,
boolean singleStreamWrapper,
boolean underlyingIsFragmentEvent,
int underlyingStreamNumber,
EventPropertyGetter underlyingPropertyEventGetter,
ExprEvaluator underlyingExprEvaluator) {
super(selectExprContext, resultEventType, namedStreams, usingWildcard);
this.unnamedStreams = unnamedStreams;
this.singleStreamWrapper = singleStreamWrapper;
this.underlyingIsFragmentEvent = underlyingIsFragmentEvent;
this.underlyingStreamNumber = underlyingStreamNumber;
this.underlyingPropertyEventGetter = underlyingPropertyEventGetter;
this.underlyingExprEvaluator = underlyingExprEvaluator;
}
public EventBean processSpecific(Map<String, Object> props, EventBean[] eventsPerStream, ExprEvaluatorContext exprEvaluatorContext)
{
// In case of a wildcard and single stream that is itself a
// wrapper bean, we also need to add the map properties
if(singleStreamWrapper)
{
DecoratingEventBean wrapper = (DecoratingEventBean)eventsPerStream[0];
if(wrapper != null)
{
Map<String, Object> map = wrapper.getDecoratingProperties();
props.putAll(map);
}
}
EventBean event = null;
if (underlyingIsFragmentEvent)
{
EventBean eventBean = eventsPerStream[underlyingStreamNumber];
event = (EventBean) eventBean.getFragment(unnamedStreams.get(0).getStreamSelected().getStreamName());
}
else if (underlyingPropertyEventGetter != null)
{
Object value = underlyingPropertyEventGetter.get(eventsPerStream[underlyingStreamNumber]);
if (value != null)
{
event = super.getSelectExprContext().getEventAdapterService().adapterForBean(value);
}
}
else if (underlyingExprEvaluator != null) {
Object value = underlyingExprEvaluator.evaluate(eventsPerStream, true, exprEvaluatorContext);
if (value != null)
{
event = super.getSelectExprContext().getEventAdapterService().adapterForBean(value);
}
}
else
{
event = eventsPerStream[underlyingStreamNumber];
}
// Using a wrapper bean since we cannot use the same event type else same-type filters match.
// Wrapping it even when not adding properties is very inexpensive.
return super.getSelectExprContext().getEventAdapterService().adapterForTypedWrapper(event, props, super.getResultEventType());
}
}