CopyStreamAdapter unconditionally resets the CopyStreamEvent source and is 
inefficient
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                 Key: NET-359
                 URL: https://issues.apache.org/jira/browse/NET-359
             Project: Commons Net
          Issue Type: Bug
            Reporter: Sebb


The CopyStreamAdapter.bytesTransferred(CopyStreamEvent event) method unpacks 
the event in order to pass the parameters to bytesTransferred(long, int, long) 
method which creates a new event and propagates it to the listeners.

This means that the original event source is lost, and there is an unnecessary 
event creation.

It seems wrong for the bytesTransferred(long, int, long) method to create a 
CopyStreamEvent - the interface Javadoc specifically says that the 
bytesTransferred(long, int, long) method was added to avoid the need to create 
the event.

It would make more sense if the adapter handled the methods independently, i.e. 
if the caller provides an event, pass that on, otherwise pass on the individual 
parameters to the listeners.

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