plone.app.discussion/plone/app/discussion/browser/traversal.py

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"""Implement the ++comments++ traversal namespace. This should return the
IDiscussion container for the context, from which traversal will continue
into an actual comment object.
"""
from zope.interface import Interface, implements
from zope.component import adapts, queryAdapter
from zope.traversing.interfaces import ITraversable, TraversalError
from zope.publisher.interfaces.browser import IBrowserRequest
from plone.app.discussion.interfaces import IConversation
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class ConversationNamespace(object):
"""Allow traversal into a conversation via a ++conversation++name
namespace. The name is the name of an adapter from context to
IConversation. The special name 'default' will be taken as the default
(unnamed) adapter. This is to work around a bug in OFS.Traversable which
does not allow traversal to namespaces with an empty string name.
"""
implements(ITraversable)
adapts(Interface, IBrowserRequest)
def __init__(self, context, request=None):
self.context = context
self.request = request
def traverse(self, name, ignore):
if name == "default":
name = u""
conversation = queryAdapter(self.context, IConversation, name=name)
if conversation is None:
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raise TraversalError(name) # pragma: no cover
return conversation