Method getDurationUnits

src/utils/DateTime.java:242–258

Returns the suffix or "units" of the duration as a string. The result will be ms, s, m, h, d, w, n or y. @param duration The duration in the format #units, e.g. 1d or 6h @return Just the suffix, e.g. 'd' or 'h' @throws IllegalArgumentException if the duration is null, empty or if the units are inval

(final String duration)

   * @since 2.4
   */
  public static final String getDurationUnits(final String duration) {
    if (duration == null || duration.isEmpty()) {
      throw new IllegalArgumentException("Duration cannot be null or empty");
    }
    int unit = 0;
    while (unit < duration.length() && 
        Character.isDigit(duration.charAt(unit))) {
      unit++;
    }
    final String units = duration.substring(unit).toLowerCase();
    if (units.equals("ms") || units.equals("s") || units.equals("m") || 
        units.equals("h") || units.equals("d") || units.equals("w") || 
        units.equals("n") || units.equals("y")) {
      return units;
    }
    throw new IllegalArgumentException("Invalid units in the duration: " + units);
  }
  
  /**
   * Parses the prefix of the duration, the interval and returns it as a number.