operator + method

ValidatedQuantity? operator +(Object other)

Implementation

ValidatedQuantity? operator +(Object other) {
  if (other is UcumDecimal) {
    return copyWith(value: value.add(other));
  } else if (other is ValidatedQuantity) {
    if (UcumService().isComparable(unit, other.unit)) {
      return copyWith(value: value.add(other.value));
    } else {
      return null;
    }
  } else if (other is num || other is BigInt) {
    return copyWith(
        value: value.add(UcumDecimal.fromString(other.toString())));
  } else if (other is String) {
    final ValidatedQuantity newQuantity = ValidatedQuantity.fromString(other);
    if (newQuantity.isValid()) {
      return copyWith(value: value.add(newQuantity.value));
    } else {
      throw UcumException('$this could not be added to $other '
          '(reason: it is not an accepted type)');
    }
  } else {
    throw UcumException('$this could not be added to $other '
        '(reason: it is not an accepted type)');
  }
}