/**************************************************************************************
* 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.view;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventType;
import com.espertech.esper.collection.EventDistinctIterator;
import com.espertech.esper.collection.MultiKey;
import com.espertech.esper.collection.UniformPair;
import com.espertech.esper.core.service.StatementContext;
import com.espertech.esper.core.service.StatementResultListener;
import com.espertech.esper.core.service.UpdateDispatchView;
import com.espertech.esper.epl.core.ResultSetProcessor;
import com.espertech.esper.epl.join.base.JoinExecutionStrategy;
import com.espertech.esper.view.Viewable;
import java.util.Iterator;
import java.util.Set;
public class OutputStrategyUtil
{
public static void output(boolean forceUpdate, UniformPair<EventBean[]> result, UpdateDispatchView finalView)
{
EventBean[] newEvents = result != null ? result.getFirst() : null;
EventBean[] oldEvents = result != null ? result.getSecond() : null;
if(newEvents != null || oldEvents != null)
{
finalView.newResult(result);
}
else if(forceUpdate)
{
finalView.newResult(result);
}
}
/**
* Indicate statement result.
* @param newOldEvents result
*/
public static void indicateEarlyReturn(StatementContext statementContext, UniformPair<EventBean[]> newOldEvents) {
if (newOldEvents == null) {
return;
}
if ((statementContext.getMetricReportingService() != null) &&
(statementContext.getMetricReportingService().getStatementOutputHooks() != null) &&
(!statementContext.getMetricReportingService().getStatementOutputHooks().isEmpty())) {
for (StatementResultListener listener : statementContext.getMetricReportingService().getStatementOutputHooks()) {
listener.update(newOldEvents.getFirst(), newOldEvents.getSecond(), statementContext.getStatementName(), null, null);
}
}
}
public static Iterator<EventBean> getIterator(JoinExecutionStrategy joinExecutionStrategy, ResultSetProcessor resultSetProcessor, Viewable parentView, boolean distinct) {
Iterator<EventBean> iterator;
EventType eventType;
if (joinExecutionStrategy != null)
{
Set<MultiKey<EventBean>> joinSet = joinExecutionStrategy.staticJoin();
iterator = resultSetProcessor.getIterator(joinSet);
eventType = resultSetProcessor.getResultEventType();
}
else if(resultSetProcessor != null)
{
iterator = resultSetProcessor.getIterator(parentView);
eventType = resultSetProcessor.getResultEventType();
}
else
{
iterator = parentView.iterator();
eventType = parentView.getEventType();
}
if (!distinct)
{
return iterator;
}
return new EventDistinctIterator(iterator, eventType);
}
}