@Override
    public void addListener( FileTransferEventListener eventListener )
    {
        eventListeners.add( eventListener );
    }
Returns true if the proxy transfer should be matched to an existing file transfer
in the system.

@return Returns true if the proxy transfer should be matched to an existing file
transfer in the system.
xmppserver/src/main/java/org/jivesoftware/openfire/filetransfer/DefaultFileTransferManager.java