Quantity UnitOfMeasureConversion::convert(const Quantity& quantity) const {
switch (data_->type) {
case Direct:
if (quantity.unitOfMeasure() == data_->source)
return Quantity(quantity.commodityType(),
data_->target,
quantity.amount()*data_->conversionFactor);
else if (quantity.unitOfMeasure() == data_->target)
return Quantity(quantity.commodityType(),
data_->source,
quantity.amount()/data_->conversionFactor);
else
QL_FAIL("direct conversion not applicable");
case Derived:
if (quantity.unitOfMeasure()
== data_->conversionFactorChain.first->source() ||
quantity.unitOfMeasure()
== data_->conversionFactorChain.first->target())
return data_->conversionFactorChain.second->convert(
data_->conversionFactorChain.first->convert(quantity));
else if (quantity.unitOfMeasure()
== data_->conversionFactorChain.second->source() ||
quantity.unitOfMeasure()
== data_->conversionFactorChain.second->target())
return data_->conversionFactorChain.first->convert(
data_->conversionFactorChain.second->convert(quantity));
else
QL_FAIL("derived conversion factor not applicable");
default:
QL_FAIL("unknown conversion-factor type");
}
}
