/*
***************************************************************************************
* 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.expression.subquery;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.agg.service.AggregationService;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import java.util.ArrayDeque;
import java.util.Collection;
import java.util.Map;
/**
* Represents a subselect in an expression tree.
*/
public class SubselectEvalStrategyRowUnfilteredSelectedGroupedNoHaving extends SubselectEvalStrategyRowUnfilteredSelected
implements SubselectEvalStrategyRow {
public Object evaluate(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext exprEvaluatorContext, ExprSubselectRowNode parent) {
Collection<Object> groupKeys = parent.getSubselectAggregationService().getGroupKeys(exprEvaluatorContext);
if (groupKeys.isEmpty() || groupKeys.size() > 1) {
return null;
}
parent.getSubselectAggregationService().setCurrentAccess(groupKeys.iterator().next(), exprEvaluatorContext.getAgentInstanceId(), null);
return super.evaluate(eventsPerStream, newData, matchingEvents, exprEvaluatorContext, parent);
}
public Collection evaluateGetCollScalar(EventBean[] eventsPerStream, boolean isNewData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
return null;
}
public EventBean evaluateGetEventBean(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
return null;
}
public Collection<EventBean> evaluateGetCollEvents(EventBean[] eventsPerStream, boolean newData, Collection<EventBean> matchingEvents, ExprEvaluatorContext context, ExprSubselectRowNode parent) {
AggregationService aggregationService = parent.getSubselectAggregationService().getContextPartitionAggregationService(context.getAgentInstanceId());
Collection<Object> groupKeys = aggregationService.getGroupKeys(context);
if (groupKeys.isEmpty()) {
return null;
}
Collection<EventBean> events = new ArrayDeque<EventBean>(groupKeys.size());
for (Object groupKey : groupKeys) {
aggregationService.setCurrentAccess(groupKey, context.getAgentInstanceId(), null);
Map<String, Object> row = parent.evaluateRow(null, true, context);
EventBean event = parent.subselectMultirowType.getEventAdapterService().adapterForTypedMap(row, parent.subselectMultirowType.getEventType());
events.add(event);
}
return events;
}
}