/usr/share/pyshared/zope/annotation/attribute.py is in python-zope.annotation 3.5.0-0ubuntu5.
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#
# Copyright (c) 2001, 2002 Zope Corporation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Attribute Annotations implementation
$Id: attribute.py 72995 2007-03-05 21:36:39Z jacobholm $
"""
__docformat__ = 'restructuredtext'
from UserDict import DictMixin
from BTrees.OOBTree import OOBTree
from zope import component, interface
from zope.annotation import interfaces
class AttributeAnnotations(DictMixin):
"""Store annotations on an object
Store annotations in the `__annotations__` attribute on a
`IAttributeAnnotatable` object.
"""
interface.implements(interfaces.IAnnotations)
component.adapts(interfaces.IAttributeAnnotatable)
def __init__(self, obj, context=None):
self.obj = obj
def __nonzero__(self):
return bool(getattr(self.obj, '__annotations__', 0))
def get(self, key, default=None):
"""See zope.annotation.interfaces.IAnnotations"""
annotations = getattr(self.obj, '__annotations__', None)
if not annotations:
return default
return annotations.get(key, default)
def __getitem__(self, key):
annotations = getattr(self.obj, '__annotations__', None)
if annotations is None:
raise KeyError(key)
return annotations[key]
def keys(self):
annotations = getattr(self.obj, '__annotations__', None)
if annotations is None:
return []
return annotations.keys()
def __setitem__(self, key, value):
"""See zope.annotation.interfaces.IAnnotations"""
try:
annotations = self.obj.__annotations__
except AttributeError:
annotations = self.obj.__annotations__ = OOBTree()
annotations[key] = value
def __delitem__(self, key):
"""See zope.app.interfaces.annotation.IAnnotations"""
try:
annotation = self.obj.__annotations__
except AttributeError:
raise KeyError(key)
del annotation[key]
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