public Demands CalculateUnsatisfiedDemands(Demands demands)
{
Demands unSatisfiedDemands = new Demands();
Dictionary <Provider, Quantity> reservableQuantityToProvider =
new Dictionary <Provider, Quantity>();
foreach (var provider in StackSet)
{
reservableQuantityToProvider.Add(provider, provider.GetQuantity());
}
foreach (var demand in demands.GetAll())
{
Quantity neededQuantity = demand.GetQuantity();
foreach (var provider in StackSet)
{
Quantity reservableQuantity = reservableQuantityToProvider[provider];
if (provider.GetArticleId().Equals(demand.GetArticleId()) &&
reservableQuantity.IsGreaterThan(Quantity.Null()))
{
reservableQuantityToProvider[provider] = reservableQuantity
.Minus(neededQuantity);
neededQuantity = neededQuantity.Minus(reservableQuantity);
// neededQuantity < 0
if (neededQuantity.IsSmallerThan(Quantity.Null()))
{
break;
}
// neededQuantity > 0: continue to provide it
}
}
if (neededQuantity.IsGreaterThan(Quantity.Null()))
{
unSatisfiedDemands.Add(demand);
}
}
return(unSatisfiedDemands);
}
