/**
* Inserts the given glist.
* Throws a new NullReferenceException() if glist is null.
* Throws a new DuplicateNameException() if glist is equal to another GList belonging to
* the same user, or if glist has the same name as another GList belonging to the same user.
* Throws a new ArgumentException() if glist.Id is equal to the id of any other GList in the database.
* Returns the inserted GList.
**/
public GList InsertList(GList glist)
{
if (glist == null)
{
throw new NullReferenceException();
}
IEnumerable <GList> allLists = GetAllLists();
IEnumerable <GList> userLists = allLists.Where(g => g.AccountId == glist.AccountId);
foreach (GList groceryList in userLists)
{
if (glist.Equals(groceryList))
{
throw new DuplicateNameException();
}
else if (glist.ListName.Equals(groceryList.ListName))
{
throw new DuplicateNameException();
}
}
if (allLists.Any(g => g.Id == glist.Id))
{
throw new ArgumentException();
}
_gListAccessor.Insert(glist);
return(glist);
}
