Langauge Switcher

Let’s show how z3c.language.switch works:

Imports and placeless setup:

>>> import zope.component
>>> from zope.app.testing import placelesssetup
>>> from z3c.language.switch import II18nLanguageSwitch
>>> from z3c.language.switch.testing import IContentObject
>>> from z3c.language.switch.testing import II18nContentObject
>>> from z3c.language.switch.testing import I18nContentObject
>>> from z3c.language.switch.testing import I18nContentObjectLanguageSwitch
>>> from z3c.language.switch.testing import ContentObject
>>> placelesssetup.setUp()

Setup test object:

>>> en_title = u'en_title'
>>> obj = I18nContentObject(en_title)
>>> obj.title
u'en_title'

Add additional languages:

>>> de_title = u'de_title'
>>> fr_title = u'fr_title'
>>> deObj = obj.addLanguage('de', de_title)
>>> frObj = obj.addLanguage('fr', fr_title)

Switch default language:

>>> obj.title
u'en_title'

>>> obj.setDefaultLanguage('de')
>>> obj.title
u'de_title'

Remove the ‘en’ language object:

>>> obj._data.keys()
['de', 'en', 'fr']
>>> obj.removeLanguage('en')
>>> obj._data.keys()
['de', 'fr']

Remove default language object will end in a ValueError error:

>>> obj.removeLanguage('de')
Traceback (most recent call last):
...
ValueError: cannot remove default language (de)

Remove nonexistent language object will end in a ValueError error:

>>> obj.removeLanguage('undefined')
Traceback (most recent call last):
...
ValueError: cannot remove nonexistent language (undefined)

Set default language to a non existent language will end in a ValueError:

>>> obj.setDefaultLanguage('en')
Traceback (most recent call last):
...
ValueError: cannot set nonexistent language (en) as default

Access the language directly via the II18nLanguageSwitch adapter, first register the adapter for the I18nContentObject:

>>> zope.component.provideAdapter(I18nContentObjectLanguageSwitch,
...     (II18nContentObject,), provides=II18nLanguageSwitch)

The adapter is set to the default language in the init method:

>>> adapted = II18nLanguageSwitch(obj)
>>> adapted.title
u'de_title'

Change the default language and access the title again, the title should not switch to another language:

>>> obj.setDefaultLanguage('fr')
>>> adapted.title
u'de_title'

Switch the language to ‘fr’ via the adapter:

>>> adapted.setLanguage('fr')
>>> adapted.title
u'fr_title'

Finally, clean up:

>>> placelesssetup.tearDown()

CHANGES