/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* 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.core.ExprEvaluator;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.epl.spec.SelectClauseStreamCompiledSpec;
import com.espertech.esper.epl.table.mgmt.TableMetadata;
import com.espertech.esper.event.DecoratingEventBean;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.List;
import java.util.Map;
public class EvalSelectStreamWUnderlying extends EvalSelectStreamBaseMap implements SelectExprProcessor {
private static final Logger log = LoggerFactory.getLogger(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;
private final TableMetadata tableMetadata;
public EvalSelectStreamWUnderlying(SelectExprContext selectExprContext,
EventType resultEventType,
List<SelectClauseStreamCompiledSpec> namedStreams,
boolean usingWildcard,
List<SelectExprStreamDesc> unnamedStreams,
boolean singleStreamWrapper,
boolean underlyingIsFragmentEvent,
int underlyingStreamNumber,
EventPropertyGetter underlyingPropertyEventGetter,
ExprEvaluator underlyingExprEvaluator,
TableMetadata tableMetadata) {
super(selectExprContext, resultEventType, namedStreams, usingWildcard);
this.unnamedStreams = unnamedStreams;
this.singleStreamWrapper = singleStreamWrapper;
this.underlyingIsFragmentEvent = underlyingIsFragmentEvent;
this.underlyingStreamNumber = underlyingStreamNumber;
this.underlyingPropertyEventGetter = underlyingPropertyEventGetter;
this.underlyingExprEvaluator = underlyingExprEvaluator;
this.tableMetadata = tableMetadata;
}
public EventBean processSpecific(Map<String, Object> props, EventBean[] eventsPerStream, boolean isNewData, 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 theEvent = null;
if (underlyingIsFragmentEvent) {
EventBean eventBean = eventsPerStream[underlyingStreamNumber];
theEvent = (EventBean) eventBean.getFragment(unnamedStreams.get(0).getStreamSelected().getStreamName());
} else if (underlyingPropertyEventGetter != null) {
Object value = underlyingPropertyEventGetter.get(eventsPerStream[underlyingStreamNumber]);
if (value != null) {
theEvent = super.getSelectExprContext().getEventAdapterService().adapterForBean(value);
}
} else if (underlyingExprEvaluator != null) {
Object value = underlyingExprEvaluator.evaluate(eventsPerStream, true, exprEvaluatorContext);
if (value != null) {
theEvent = super.getSelectExprContext().getEventAdapterService().adapterForBean(value);
}
} else {
theEvent = eventsPerStream[underlyingStreamNumber];
if (tableMetadata != null && theEvent != null) {
theEvent = tableMetadata.getEventToPublic().convert(theEvent, eventsPerStream, isNewData, exprEvaluatorContext);
}
}
// 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(theEvent, props, super.getResultEventType());
}
}