code: @Nonnull
    public String getCSSAsString (@Nonnull final CascadingStyleSheet aCSS)
    {
      final NonBlockingStringWriter aSW = new NonBlockingStringWriter ();
      try
      {
        writeCSS (aCSS, aSW);
      }
      catch (final IOException ex)
      {
        // Should never occur since NonBlockingStringWriter does not throw such an
        // exception
        throw new IllegalStateException ("Totally unexpected", ex);
      }
      return aSW.getAsString ();
    }
docs: Create the CSS without a specific charset.
  
  @param aCSS
  The CSS object to be converted to text. May not be <code>null</code>
  .
  @return The text representation of the CSS.
  @see #writeCSS(CascadingStyleSheet, Writer)