Abstract Factory for the figures to be used by the BoardDrawing.
Responsible for generating the multimap of graphical pieces corresponding to
the initial setup of the board game. This builder is only invoked during
construction of the BoardDrawing instance to make the initial collection of
create a multimap of all the BoardFigures that represent pieces in the
board game. For instance this method should create 16 black and 16 white
board figures for a chess game. POSTCONDITION: The multimap MUST contain a
non-null list for every LOCATION on the board game, even if the list is
empty! POSTCONDITON: The LOCATION type must implement methods equals() and
possibly hashCode() so lookups can be made in the returned map.
a multimap, where the key is a LOCATION on the board game and the
value is a list of BoardFigures located at this location. Many
board games only allow a single piece on a given location (like
chess) which means the lists will only contain a single figure.
Other games, like backgammon, may contain many pieces and thus
several board figures on the same location.
create a map of all the BoardFigures that represent props (immovable
figures) on the board game. An example is the two die figures in a
backgammon game. Each unique prop/board figure must be associated a string
key, like "die1" and "die2" for the backgammon dice example. Note that the
string key will be used by the BoardGame's BoardDrawing to request its
coordinates using the PositioningStrategy hotspot. If no props are used
then the returned map may be null.