org.mule.routing.DefaultRouterResultsHandler Maven / Gradle / Ivy
/*
* $Id: DefaultRouterResultsHandler.java 24265 2012-04-16 06:54:00Z dfeist $
* --------------------------------------------------------------------------------------
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
*
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.routing;
import org.mule.DefaultMessageCollection;
import org.mule.DefaultMuleEvent;
import org.mule.VoidMuleEvent;
import org.mule.OptimizedRequestContext;
import org.mule.api.MuleContext;
import org.mule.api.MuleEvent;
import org.mule.api.MuleMessageCollection;
import org.mule.api.routing.RouterResultsHandler;
import org.mule.util.CollectionUtils;
import java.util.List;
import org.apache.commons.collections.Predicate;
/**
* The default results handler for all outbound endpoint. Depending on the number of messages passed it the
* returning message will be different. If the 'results' param is null or empty, null is returned. If the
* 'results' param contains a single {@link org.mule.api.MuleMessage}, than that message is returned. If the
* 'results' param contains more than one message a {@link org.mule.api.MuleMessageCollection} instance is
* returned.
*
* Note that right now (as of Mule 2.0.1) this SPI is not pluggable and this implementation is the default and
* only implementation.
*
* @see org.mule.api.MuleMessageCollection
* @see org.mule.api.MuleMessage
* @see org.mule.DefaultMessageCollection
*/
public class DefaultRouterResultsHandler implements RouterResultsHandler
{
@SuppressWarnings(value = {"unchecked"})
public MuleEvent aggregateResults(final List results,
final MuleEvent previous,
MuleContext muleContext)
{
if (results == null)
{
return null;
}
else if (results.size() == 1)
{
MuleEvent event = results.get(0);
if (event == null)
{
return null;
}
else if (event instanceof VoidMuleEvent)
{
return event;
}
else if (event != null && event.getMessage() != null)
{
return event;
}
else
{
return VoidMuleEvent.getInstance();
}
}
else
{
List nonNullResults = (List) CollectionUtils.select(results,
new Predicate()
{
public boolean evaluate(Object object)
{
return object != null && ((MuleEvent) object).getMessage() != null
&& !VoidMuleEvent.getInstance().equals(object);
}
});
if (nonNullResults.size() == 0)
{
return VoidMuleEvent.getInstance();
}
else if (nonNullResults.size() == 1)
{
return nonNullResults.get(0);
}
else
{
return createMessageCollection(nonNullResults, previous, muleContext);
}
}
}
private MuleEvent createMessageCollection(final List nonNullResults,
final MuleEvent previous,
MuleContext muleContext)
{
MuleMessageCollection coll = new DefaultMessageCollection(muleContext);
for (MuleEvent event : nonNullResults)
{
coll.addMessage(event.getMessage());
}
coll.propagateRootId(previous.getMessage());
MuleEvent resultEvent = new DefaultMuleEvent(coll, previous, previous.getSession());
for (String name : previous.getFlowVariableNames())
{
resultEvent.setFlowVariable(name, previous.getFlowVariable(name));
}
return OptimizedRequestContext.unsafeSetEvent(resultEvent);
}
}