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package org.directwebremoting.event;

import org.directwebremoting.ConversionException;
import org.directwebremoting.Hub;
import org.directwebremoting.extend.ConverterManager;
import org.directwebremoting.extend.RealRawData;

/**
 * An MessageEvent is fired to a set of {@link MessageListener}s by the DWR
 * {@link Hub}.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class DefaultMessageEvent implements MessageEvent
{
    /**
     * Constructor for use with server-side originated messages
     * @param hub The hub used to send the data
     * @param data The data to publish
     */
    public DefaultMessageEvent(Hub hub, Object data)
    {
        this.hub = hub;
        this.data = data;

        source = Source.SERVER;
    }

    /**
     * Constructor for use with client-side originated messages
     * @param hub The hub used to send the data
     * @param converterManager ...
     * @param rawData ...
     */
    public DefaultMessageEvent(Hub hub, ConverterManager converterManager, RealRawData rawData)
    {
        this.hub = hub;
        this.converterManager = converterManager;
        this.rawData = rawData;

        source = Source.INTERNET;
    }

    public Hub getHub()
    {
        return hub;
    }

    @SuppressWarnings("unchecked")
    public  T getData(Class asType)
    {
        if (source == Source.SERVER)
        {
            try
            {
                return (T) data;
            }
            catch (ClassCastException ex)
            {
                throw new ConversionException(asType, ex);
            }
        }
        else
        {
            return converterManager.convertInbound(asType, rawData);
        }
    }

    /**
     * WARNING: This method is for internal use only. It may well disappear at
     * some stage in the future
     * Sometimes we just want to get at whatever the data was originally without
     * any conversion.
     * @return The original data probably of type RawData
     */
    public Object getRawData()
    {
        if (source == Source.SERVER)
        {
            return data;
        }
        else
        {
            return rawData;
        }
    }

    /**
     * Did the data come from the web or from the server?
     */
    private enum Source
    {
        SERVER, INTERNET
    }

    private Hub hub;
    private Object data;
    private RealRawData rawData;
    private Source source;
    private ConverterManager converterManager;
}