protected void doCloseInternal () throws CIFSException {
        try {
            @SuppressWarnings ( "resource" )
            SmbTreeHandleImpl th = getTreeHandle();
            if ( this.fileId != null && th.isConnected() ) {
                th.send(new Smb2CloseRequest(th.getConfig(), this.fileId));
            }
        }
        finally {
            this.fileId = null;
        }
    }