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|
=======================================================
``zope.component.factory``: Object Creation Factories
=======================================================
See :mod:`zope.component.factory` for API documentation.
The Factory Class
=================
.. doctest::
>>> from zope.interface import Interface
>>> class IFunction(Interface):
... pass
>>> class IKlass(Interface):
... pass
>>> from zope.interface import implementer
>>> @implementer(IKlass)
... class Klass(object):
...
... def __init__(self, *args, **kw): #*
... self.args = args
... self.kw = kw
>>> from zope.component.factory import Factory
>>> factory = Factory(Klass, 'Klass', 'Klassier')
>>> factory2 = Factory(lambda x: x, 'Func', 'Function')
>>> factory3 = Factory(lambda x: x, 'Func', 'Function', (IFunction,))
Calling a Factory
-----------------
Here we test whether the factory correctly creates the objects and
including the correct handling of constructor elements.
First we create a factory that creates instanace of the `Klass` class:
.. doctest::
>>> factory = Factory(Klass, 'Klass', 'Klassier')
Now we use the factory to create the instance
.. doctest::
>>> kl = factory(1, 2, foo=3)
and make sure that the correct class was used to create the object:
.. doctest::
>>> kl.__class__
<class 'Klass'>
Since we passed in a couple positional and a keyword argument
.. doctest::
>>> kl.args
(1, 2)
>>> kl.kw
{'foo': 3}
>>> factory2(3)
3
>>> factory3(3)
3
Title and Description
---------------------
.. doctest::
>>> factory.title
'Klass'
>>> factory.description
'Klassier'
>>> factory2.title
'Func'
>>> factory2.description
'Function'
>>> factory3.title
'Func'
>>> factory3.description
'Function'
Provided Interfaces
-------------------
.. doctest::
>>> implemented = factory.getInterfaces()
>>> implemented.isOrExtends(IKlass)
True
>>> list(implemented) == [IKlass]
True
>>> implemented2 = factory2.getInterfaces()
>>> list(implemented2)
[]
>>> implemented3 = factory3.getInterfaces()
>>> list(implemented3) == [IFunction]
True
The Component Architecture Factory API
======================================
.. doctest::
>>> import zope.component
>>> factory = Factory(Klass, 'Klass', 'Klassier')
>>> gsm = zope.component.getGlobalSiteManager()
>>> from zope.component.interfaces import IFactory
>>> gsm.registerUtility(factory, IFactory, 'klass')
Creating an Object
------------------
.. doctest::
>>> kl = zope.component.createObject('klass', 1, 2, foo=3)
>>> isinstance(kl, Klass)
True
>>> kl.args
(1, 2)
>>> kl.kw
{'foo': 3}
Accessing Provided Interfaces
-----------------------------
.. doctest::
>>> implemented = zope.component.getFactoryInterfaces('klass')
>>> implemented.isOrExtends(IKlass)
True
>>> [iface for iface in implemented] == [IKlass]
True
List of All Factories
---------------------
.. doctest::
>>> [(str(name), fac.__class__) for name, fac in
... zope.component.getFactoriesFor(IKlass)]
[('klass', <class 'zope.component.factory.Factory'>)]
|
