code: protected void closeFile() {
  	if (this.qw != null) {
  	    try {
  		this.qw.close();
  	    }
  	    catch (java.io.IOException e) {
  		// Exceptionally, it does not make sense to delegate to an
  		// ErrorHandler. Since a closed appender is basically dead.
  		LogLog.error("Could not close " + qw, e);
  	    }
  	}
      }
docs: Closes the previously opened file.