code: @Nonnull
    @Nonempty
    public static String getHSLAColorValue (final int nHue,
                                            final int nSaturation,
                                            final int nLightness,
                                            final float fOpacity)
    {
      return new StringBuilder (32).append (CCSSValue.PREFIX_HSLA_OPEN)
                                   .append (getHSLHueValue (nHue))
                                   .append (',')
                                   .append (getHSLPercentageValue (nSaturation))
                                   .append ("%,")
                                   .append (getHSLPercentageValue (nLightness))
                                   .append ("%,")
                                   .append (getOpacityToUse (fOpacity))
                                   .append (CCSSValue.SUFFIX_HSLA_CLOSE)
                                   .toString ();
    }
docs: Get the passed values as CSS HSLA color value
  
  @param nHue
  Hue - is scaled to 0-359
  @param nSaturation
  Saturation - is scaled to 0-100
  @param nLightness
  Lightness - is scaled to 0-100
  @param fOpacity
  Opacity - is scaled to 0-1
  @return The CSS string to use