... but throw later when trying to access the data of the item in
question.
Note that this was demanded by [at] joakim-hove and that I do not want
to be held responsible for any issues which are caused by this
approach. (read: please direct your barks to Joakim if you fell on
your nose because of this...)
I know it was only added recently, but all of the "setInDeck()" calls
can now be substituted by a combination of item->size() and
item->defaultApplied(index)...
The data values in a deck item can be in three different states, given
by the DeckValue enum in DeckItem.hpp. The three values are:
SET_IN_DECK : The value has been set explictly in the deck.
DEFAULT : The value was not present in the input deck, but a default
value has been supplied in the configuration and that value
has been set.
NOT_SET : No value has been set for this item; it was not explicitly
set in the deck and also not included in the configuration.
If you ask for DeckItem->value which is in state NOT_SET you will get an
exception. The method setInDeck() can be used to check if a value has
been set explicitly in the deck; the method defaultApplied() will check
if a default value has been applied.
Observe that the system for handling defaults is not really well suited
for multi valued data items, as it is only a scalar state variable. In
the case of multi valued data items both defaultApplied() and
setInDeck() might return true.
We now have an enum which can keep track of three possible states for
the data in a deck item:
VALID : A valid value has been set
DEFAULT : The default value has been applied
NOT_SET : The value has not been set.
The intention is to throw if/when a DeckItem with status == NOT_SET is
accessed.
