org.mule.routing.DefaultRouterResultsHandler Maven / Gradle / Ivy

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/*
 * $Id: DefaultRouterResultsHandler.java 20321 2010-11-24 15:21:24Z 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.api.MuleContext;
import org.mule.api.MuleEvent;
import org.mule.api.MuleMessage;
import org.mule.api.MuleMessageCollection;
import org.mule.api.routing.RouterResultsHandler;

import java.util.List;

/**
 * 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
{
    public MuleEvent aggregateResults(List results, MuleEvent previous, MuleContext muleContext)
    {
        MuleMessage aggregate;

        if (results == null || results.size() == 0)
        {
            aggregate = null;
        }
        else if (results.size() == 1)
        {
            MuleEvent event = results.get(0);
            aggregate = event == null ? null : event.getMessage();
        }
        else
        {
            MuleMessageCollection coll = new DefaultMessageCollection(muleContext);
            for (MuleEvent event : results)
            {
                MuleMessage muleMessage = event == null ? null : event.getMessage();
                if(muleMessage!=null)
                {
                    coll.addMessage(muleMessage);
                }
            }
            aggregate = coll;
        }

        return aggregate == null ? null : new DefaultMuleEvent(aggregate, previous);
    }
}