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The CopyStreamListener class can accept CopyStreamEvents to keep track of the progress of a stream copying operation. However, it is currently not used that way within NetComponents for performance reasons. Rather the bytesTransferred(long, int) method is called directly rather than passing an event to bytesTransferred(CopyStreamEvent), saving the creation of a CopyStreamEvent instance. Also, the only place where CopyStreamListener is currently used within NetComponents is in the static methods of the uninstantiable class, which would preclude the use of addCopyStreamListener and removeCopyStreamListener methods. However, future additions may use the JavaBean event model, which is why the hooks have been included from the beginning.

$Id: 1299238 2012-03-10 17:12:28Z sebb $
See also:
public interface CopyStreamListener extends EventListener
This method is invoked by a CopyStreamEvent source after copying a block of bytes from a stream. The CopyStreamEvent will contain the total number of bytes transferred so far and the number of bytes transferred in the last write.

event The CopyStreamEvent fired by the copying of a block of bytes.
    public void bytesTransferred(CopyStreamEvent event);

This method is not part of the JavaBeans model and is used by the static methods in the class for efficiency. It is invoked after a block of bytes to inform the listener of the transfer.

totalBytesTransferred The total number of bytes transferred so far by the copy operation.
bytesTransferred The number of bytes copied by the most recent write.
streamSize The number of bytes in the stream being copied. This may be equal to CopyStreamEvent.UNKNOWN_STREAM_SIZE if the size is unknown.
    public void bytesTransferred(long totalBytesTransferred,
                                 int bytesTransferred,
                                 long streamSize);
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