code: private void addDataUsageNameToList(String dataUsageName) {
          validateStringValue(dataUsageName);
          Set<String> currentValues = getDataUsageNameList();
          currentValues.add(dataUsageName);
          setProperty(ProcessContextProperty.ALL_DATA_USAGES, ArrayUtils.toString(currentValues.toArray()));
      }
docs: Adds a new data usage property name to the list of data usage properties
  (DATA_USAGES-field).
  
  @param dataUsageName The name of the data usage-property to add (e.g.
  DATA_USAGE_5).
  @throws ParameterException if the given property name is invalid.