code: private static List<DataUsage> parseDataUsageString(String dataUsageString) throws ParameterException {
  		List<String> dataUsageStrings = Arrays.asList(dataUsageString.split("\\s*,\\s*"));
  		List<DataUsage> dataUsageList = new ArrayList<>(dataUsageStrings.size());
  		for (String d : dataUsageStrings) {
  			DataUsage dataUsage = DataUsage.parse(d);
  			if (!dataUsageList.contains(dataUsage))
  				dataUsageList.add(dataUsage);
  		}
  		return dataUsageList;
  	}
docs: Takes a String containing {@link DataUsage} identifier separated by commas, removes every leading and training whitespace, and parses them into a {@link List}. <br>
  TODO move to TOVAL into enum {@link DataUsage}?