private static void SaveProjections(IPersistenceProvider transaction, IEnumerable <ProjectionItem <IPersistable> > changes)
{
foreach (var item in changes)
{
switch (item.ProjectionItemAction)
{
case ProjectionItemActionEnum.Nothing:
break;
case ProjectionItemActionEnum.New:
var result = transaction.Insert(item.Value);
if (result != PersistenceResultEnum.Success)
{
throw new ConcurrencyException("The item with id {0} is already inserted".InvariantFormat(item.Value.DocumentKey));
}
break;
case ProjectionItemActionEnum.UpdateOrNew:
result = transaction.UpdateOrInsert(item.Value);
if (result != PersistenceResultEnum.Success)
{
throw new ConcurrencyException("The item with id {0} has been updated before this update".InvariantFormat(item.Value.DocumentKey));
}
break;
case ProjectionItemActionEnum.Delete:
result = transaction.Delete(item.Value);
if (result != PersistenceResultEnum.Success)
{
throw new ConcurrencyException("The item with id {0} cannot be deleted.".InvariantFormat(item.Value.DocumentKey));
}
break;
default:
throw new EventSourcingException("The type of the item is invalid");
}
}
}