code: @Nullable
    public static CascadingStyleSheet readFromFile (@Nonnull final File aFile,
                                                    @Nonnull final Charset aFallbackCharset,
                                                    @Nonnull final ECSSVersion eVersion,
                                                    @Nullable final ICSSParseExceptionCallback aCustomExceptionHandler)
    {
      return readFromFile (aFile,
                           new CSSReaderSettings ().setFallbackCharset (aFallbackCharset)
                                                   .setCSSVersion (eVersion)
                                                   .setCustomExceptionHandler (aCustomExceptionHandler));
    }
docs: Read the CSS from the passed File.
  
  @param aFile
  The file containing the CSS to be parsed. May not be
  <code>null</code>.
  @param aFallbackCharset
  The charset to be used in case neither a <code>@charset</code> rule
  nor a BOM is present. May not be <code>null</code>.
  @param eVersion
  The CSS version to use. May not be <code>null</code>.
  @param aCustomExceptionHandler
  An optional custom exception handler that can be used to collect the
  unrecoverable parsing errors. May be <code>null</code>.
  @return <code>null</code> if reading failed, the CSS declarations
  otherwise.