Add documentation for FactoryAggregate provider

docs/providers/factory.rst

@@ -147,4 +147,38 @@ Listing of ``example.py``:
    :language: python
    :linenos:
 
+Factory aggregate providers
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+:py:class:`FactoryAggregate` provider is a special type of provider that 
+aggregates other :py:class:`Factory` providers.
+
+.. note::
+
+    :py:class:`FactoryAggregate` is not overridable. Calling of 
+    :py:meth:`FactoryAggregate.override` will result in raising of an 
+    expection.
+
+Next prototype might be the best demonstration of 
+:py:class:`FactoryAggregate` features:
+
+.. literalinclude:: ../../examples/providers/factory_aggregate/prototype.py
+   :language: python
+   :linenos:
+
+Example below shows one of the :py:class:`FactoryAggregate` use cases, when 
+concrete implementation (game) must be selected based on dynamic input (CLI). 
+
+Listing of ``games.py``:
+
+.. literalinclude:: ../../examples/providers/factory_aggregate/games.py
+   :language: python
+   :linenos:
+
+Listing of ``example.py``:
+
+.. literalinclude:: ../../examples/providers/factory_aggregate/example.py
+   :language: python
+   :linenos:
+
 .. disqus::

examples/providers/factory_aggregate/example.py

@@ -13,15 +13,17 @@ game_factory = providers.FactoryAggregate(chess=providers.Factory(Chess),
 
 if __name__ == '__main__':
     game_type = sys.argv[1].lower()
+    player1 = sys.argv[2].capitalize()
+    player2 = sys.argv[3].capitalize()
 
-    selected_game = game_factory.create(game_type)
+    selected_game = game_factory(game_type, player1, player2)
     selected_game.play()
 
-    # $ python example.py chess
+    # $ python example.py chess John Jane
-    # Playing chess
+    # John and Jane are playing chess
-
+    #
-    # $ python example.py checkers
+    # $ python example.py checkers John Jane
-    # Playing checkers
+    # John and Jane are playing checkers
-
+    #
-    # $ python example.py ludo
+    # $ python example.py ludo John Jane
-    # Playing ludo
+    # John and Jane are playing ludo

examples/providers/factory_aggregate/games.py

@@ -1,12 +1,18 @@
-"""Example module."""
+"""Example games module."""
 
 
 class Game(object):
     """Base game class."""
 
+    def __init__(self, player1, player2):
+        """Initializer."""
+        self.player1 = player1
+        self.player2 = player2
+
     def play(self):
         """Play game."""
-        print('Playing {0}'.format(self.__class__.__name__.lower()))
+        print('{0} and {1} are playing {2}'.format(
+            self.player1, self.player2, self.__class__.__name__.lower()))
 
 
 class Chess(Game):

examples/providers/factory_aggregate/prototype.py

@@ -6,19 +6,12 @@ class FactoryAggregate(object):
 
     def __init__(self, **factories):
         """Initializer."""
-        self._factories = factories
+        self.factories = factories
+
+    def __call__(self, factory_name, *args, **kwargs):
+        """Create object."""
+        return self.factories[factory_name](*args, **kwargs)
 
     def __getattr__(self, factory_name):
-        """Return factory."""
+        """Return factory with specified name."""
-        if factory_name not in self._factories:
+        return self.factories[factory_name]
-            raise AttributeError('There is no such factory')
-        return self._factories[factory_name]
-
-    def create(self, factory_name, *args, **kwargs):
-        """Create object."""
-        if factory_name not in self._factories:
-            raise AttributeError('There is no such factory')
-
-        factory = self._factories[factory_name]
-
-        return factory(*args, **kwargs)