concatenate method

@override UnitConverter concatenate(UnitConverter converter)

Concatenates this converter with another converter.

The resulting converter is equivalent to first converting by the specified converter, and then converting by this converter.

Implementation

@override
UnitConverter concatenate(UnitConverter converter) {
  if (converter is RationalConverter) {
    var that = converter;
    var dividendLong = factor.dividend * that.factor.dividend;
    var divisorLong = factor.divisor * that.factor.divisor;
    var gcd = _gcd(dividendLong, divisorLong);
    return RationalConverter._valueOf(
        dividendLong ~/ gcd, divisorLong ~/ gcd);
  } else if (converter is MultiplyConverter) {
    return converter.concatenate(this);
  } else {
    return super.concatenate(converter);
  }
}