zope.dublincore 4.0.0

Using arbitrary field names

We’ve seen the simple approach, allowing a Dublin Core field to be stored on the content object using an attribute of the same name as the DC field. However, we may want to use a different name for some reason. The partialAnnotatableAdapterFactory() supports this as well.

If we call partialAnnotatableAdapterFactory() with a mapping instead of a sequence, the mapping is used to map Dublin Core field names to attribute names on the content object.

Let’s look at an example where we want the abstract attribute on the content object to be used for the description Dublin Core field:

>>> @zope.interface.implementer(
...         zope.annotation.interfaces.IAttributeAnnotatable)
... class Content(object):
...     abstract = u""

We can create the adapter factory by passing a mapping to partialAnnotatableAdapterFactory():

>>> factory = annotatableadapter.partialAnnotatableAdapterFactory(
...     {"description": "abstract"})

We can check the effects of the adapter as before:

>>> content = Content()
>>> adapter = factory(content)

>>> adapter.description
u''

>>> content.abstract = u"What it's about."
>>> adapter.description
u"What it's about."

>>> adapter.description = u"Change of plans."
>>> content.abstract
u'Change of plans.'

Limitations

The current implementation has a number of limitations to be aware of; hopefully these can be removed in the future.

• Only simple string properties, like title, are supported. This is largely because other field types have not been given sufficient thought. Attempting to use this for other fields will cause a ValueError to be raised by partialAnnotatableAdapterFactory().

• The CMF-like APIs are not supported in the generated adapters. It is not clear that these APIs are used, but content object implementations should be aware of this limitation.

Set up

>>> class Content(object):
...     created = None
...     modified = None

The annotations are stored on the IZopeDublinCore adapter. This dummy adapter reads and writes from/to the context object.

>>> import zope.component
>>> import zope.dublincore.interfaces
>>> class DummyDublinCore(object):
...     def __init__(self, context):
...         self.__dict__['context'] = context
...
...     def __getattr__(self, name):
...         return getattr(self.context, name)
...
...     def __setattr__(self, name, value):
...         setattr(self.context, name, value)

>>> zope.component.provideAdapter(
...     DummyDublinCore, (Content,), zope.dublincore.interfaces.IZopeDublinCore)

Created annotator

The created annotator sets creation and modification time to current time.

>>> content = Content()

It is registered for the ObjectCreatedEvent:

>>> import zope.dublincore.timeannotators
>>> import zope.lifecycleevent.interfaces
>>> zope.component.provideHandler(
...     zope.dublincore.timeannotators.CreatedAnnotator,
...     (zope.lifecycleevent.interfaces.IObjectCreatedEvent,))

>>> import zope.event
>>> import zope.lifecycleevent
>>> zope.event.notify(zope.lifecycleevent.ObjectCreatedEvent(content))

Both created and modified get set:

>>> content.created
datetime.datetime(<DATETIME>, tzinfo=<UTC>)
>>> content.modified
datetime.datetime(<DATETIME>, tzinfo=<UTC>)

The created annotator can also be registered for (object, event):

>>> zope.component.provideHandler(
...     zope.dublincore.timeannotators.CreatedAnnotator,
...     (None,
...      zope.lifecycleevent.interfaces.IObjectCreatedEvent,))
>>> content = Content()
>>> ignored = zope.component.subscribers(
...    (content, zope.lifecycleevent.ObjectCreatedEvent(content)), None)

Both created and modified get set this way, too:

>>> content.created
datetime.datetime(<DATETIME>, tzinfo=<UTC>)
>>> content.modified
datetime.datetime(<DATETIME>, tzinfo=<UTC>)

Modified annotator

The modified annotator only sets the modification time to current time.

>>> content = Content()

It is registered for the ObjectModifiedEvent:

>>> zope.component.provideHandler(
...     zope.dublincore.timeannotators.ModifiedAnnotator,
...     (zope.lifecycleevent.interfaces.IObjectModifiedEvent,))
>>> zope.event.notify(zope.lifecycleevent.ObjectModifiedEvent(content))

Only modified gets set:

>>> print(content.created)
None
>>> content.modified
datetime.datetime(<DATETIME>, tzinfo=<UTC>)

The modified annotator can also be registered for (object, event):

>>> zope.component.provideHandler(
...     zope.dublincore.timeannotators.ModifiedAnnotator,
...     (None,
...      zope.lifecycleevent.interfaces.IObjectModifiedEvent,))

>>> content = Content()
>>> ignored = zope.component.subscribers(
...    (content, zope.lifecycleevent.ObjectModifiedEvent(content)), None)

modified gets set, this way, too:

>>> print(content.created)
None
>>> content.modified
datetime.datetime(<DATETIME>, tzinfo=<UTC>)

4.0.0 (2013-02-20)

• Added support for Python 3.3.

• Replaced deprecated zope.component.adapts usage with equivalent zope.component.adapter decorator.

• Replaced deprecated zope.interface.implements usage with equivalent zope.interface.implementer decorator.

• Dropped support for Python 2.4 and 2.5.

3.8.2 (2010-02-19)

• Updated <DATETIME> regex normalizer to guard against test failure when a datetime’s microseconds value is zero.

3.8.1 (2010-12-14)

• Added missing test dependency on zope.configuration and missing dependency of security.zcml on zope.security’s meta.zcml.

3.8.0 (2010-09-14)

• Registered the annotators also for (object, event), so copy-pasting a folder, changes the dublin core data of the contained objects, too. The changed annotators are the following:

  • zope.dublincore.timeannotators.ModifiedAnnotator

  • zope.dublincore.timeannotators.CreatedAnnotator

  • zope.dublincore.creatorannotator.CreatorAnnotator

3.7.0 (2010-08-19)

• Removed backward-compatibility shims for deprecated zope.app.dublincore.* permissions.

• Removed include the zcml configuration of zope.dublincore.browser.

• Using python`s doctest instead of deprecated zope.testing.doctest.

3.6.3 (2010-04-23)

• Restored backward-compatible zope.app.dublincore.* permissions, mapping them onto the new permissions using the <meta:redefinePermission> directive. These shims will be removed in 3.7.0.

• Added unit (not functional) test for loadability of configure.zcml.

3.6.2 (2010-04-20)

• Repaired regression introduced in 3.6.1: the renamed permissions were not updated in other ZCML files.

3.6.1 (2010-04-19)

• Renamed the zope.app.dublincore.* permissions to zope.dublincore.*. Applications may need to fix up grants based on the old permissions.

• Added tests for zope.dublincore.timeannotators.

• Added not declared dependency on zope.lifecycleevent.

3.6.0 (2009-12-02)

• Removed the marker interface IZopeDublinCoreAnnotatable which doesn’t seem to be used.

• Made the registration of ZDCAnnotatableAdapter conditional, lifting the dependency on zope.annotation and thereby the ZODB, leaving it as a test dependency.

3.5.0 (2009-09-15)

• Add missing dependencies.

• Get rid of any testing dependencies beyond zope.testing.

• Include browser ZCML configuration only if zope.browserpage is installed.

• Specify i18n domain in package’s configure.zcml, because we use message IDs for permission titles.

• Remove unused imports, fix one test that was inactive because of being overriden by another one by a mistake.

3.4.2 (2009-01-31)

• Declare dependency on zope.datetime.

3.4.1 (2009-01-26)

• Test dependencies are declared in a test extra now.

• Fix: Make CreatorAnnotator not to fail if participation principal is None

3.4.0 (2007-09-28)

No further changes since 3.4.0a1.

3.4.0a1 (2007-04-22)

Initial release as a separate project, corresponds to zope.dublincore from Zope 3.4.0a1