code: public void setDatapoints(Map<Long, Double> datapoints) {
  		_datapoints.clear();
  		if (datapoints != null) {
  			_datapoints.putAll(datapoints);
  		}
  	}
docs: Deletes the current set of data points and replaces them with a new set.
  
  @param  datapoints  The new set of data points. If null or empty, only the deletion of the current set of data points is performed.