public Holding Add(string classification, int branchId)
{
var material = ClassificationService.Retrieve(classification);
if (material == null)
{
throw new LibraryException("Invalid classification");
}
var copyNumber = Holdings.Count(classification) + 1;
var holding = new Holding(classification, copyNumber, branchId)
{
CheckoutPolicy = material.CheckoutPolicy
};
Holdings.Add(classification, holding);
return(holding);
}
public Holding Retrieve(string barcode)
{
var classification = Holding.ClassificationFromBarcode(barcode);
return(Holdings[classification].Where(x => x.Barcode == barcode).FirstOrDefault()); // ?DO: create Holdings collection, implement iterable
}