def testImplementsITraverser(self):
self.failUnless(ITraverser.providedBy(self.tr))
def __bobo_traverse__(self, REQUEST, name):
"""Hook for Zope 2 traversal
This method is called by Zope 2's ZPublisher upon traversal.
It allows us to trick it into faking the Zope 3 traversal system
by using an ITraverser adapter.
"""
# We are trying to be compatible with Zope 2 and 3 traversal
# behaviour as much as possible. Therefore the first part of
# this method is based on BaseRequest.traverse's behaviour:
# 1. If an object has __bobo_traverse__, use it.
# 2. Otherwise do attribute look-up or, if that doesn't work,
# key item lookup.
result = _marker
if hasattr(self, '__fallback_traverse__'):
try:
return self.__fallback_traverse__(REQUEST, name)
except (AttributeError, KeyError):
pass
except NotFound:
# OFS.Application.__bobo_traverse__ calls
# REQUEST.RESPONSE.notFoundError which sets the HTTP
# status code to 404
try:
REQUEST.RESPONSE.setStatus(200)
except AttributeError:
pass
else:
# See if the object itself has the attribute, try acquisition
# later
if getattr(aq_base(self), name, _marker) is not _marker:
return getattr(self, name)
try:
# item access should never acquire
result = self[name]
# WebDAV requests will always return something,
# sometimes it's a NullResource, which we will ignore
# and return later if necessary
if not isinstance(result, NullResource):
return result
except (KeyError, IndexError, TypeError, AttributeError):
pass
# This is the part Five adds:
# 3. If neither __bobo_traverse__ nor attribute/key look-up
# work, we try to find a Zope 3-style view.
# For that we need to make sure we have a good request
# (sometimes __bobo_traverse__ gets a stub request)
if not IBrowserRequest.providedBy(REQUEST):
# Try to get the REQUEST by acquisition
REQUEST = getattr(self, 'REQUEST', None)
if not IBrowserRequest.providedBy(REQUEST):
REQUEST = FakeRequest()
setDefaultSkin(REQUEST)
# Con Zope 3 into using Zope 2's checkPermission
Products.Five.security.newInteraction()
# Use the ITraverser adapter (which in turn uses ITraversable
# adapters) to traverse to a view. Note that we're mixing
# object-graph and object-publishing traversal here, but Zope
# 2 has no way to tell us when to use which...
# TODO Perhaps we can decide on object-graph vs.
# object-publishing traversal depending on whether REQUEST is
# a stub or not?
try:
return ITraverser(self).traverse(
path=[name], request=REQUEST).__of__(self)
except (ComponentLookupError, LookupError,
AttributeError, KeyError, NotFound):
pass
# Fallback on acquisition, let it raise an AttributeError if it must
try:
return getattr(self, name)
except AttributeError:
if result is not _marker:
return result
raise
def __bobo_traverse__(self, REQUEST, name):
"""Hook for Zope 2 traversal
This method is called by Zope 2's ZPublisher upon traversal.
It allows us to trick it into faking the Zope 3 traversal system
by using an ITraverser adapter.
"""
# We are trying to be compatible with Zope 2 and 3 traversal
# behaviour as much as possible. Therefore the first part of
# this method is based on BaseRequest.traverse's behaviour:
# 1. If an object has __bobo_traverse__, use it.
# 2. Otherwise do attribute look-up or, if that doesn't work,
# key item lookup.
if zope.deprecation.__show__():
warnings.warn("The view lookup done by Traversable." \
"__bobo_traverse__ is now done by the standard " \
"traversal. This class is no longer needed and "
"will be removed in Zope 2.12.",
DeprecationWarning, 2)
if hasattr(self, '__fallback_traverse__'):
try:
return self.__fallback_traverse__(REQUEST, name)
except (AttributeError, KeyError):
pass
except NotFound:
# OFS.Application.__bobo_traverse__ calls
# REQUEST.RESPONSE.notFoundError which sets the HTTP
# status code to 404
try:
REQUEST.RESPONSE.setStatus(200)
except AttributeError:
pass
else:
try:
return getattr(self, name)
except AttributeError:
pass
try:
return self[name]
except (KeyError, IndexError, TypeError, AttributeError):
pass
# This is the part Five adds:
# 3. If neither __bobo_traverse__ nor attribute/key look-up
# work, we try to find a Zope 3-style view.
# For that we need to make sure we have a good request
# (sometimes __bobo_traverse__ gets a stub request)
if not IBrowserRequest.providedBy(REQUEST):
# Try to get the REQUEST by acquisition
REQUEST = getattr(self, 'REQUEST', None)
if not IBrowserRequest.providedBy(REQUEST):
REQUEST = FakeRequest()
setDefaultSkin(REQUEST)
# Con Zope 3 into using Zope 2's checkPermission
Products.Five.security.newInteraction()
# Use the ITraverser adapter (which in turn uses ITraversable
# adapters) to traverse to a view. Note that we're mixing
# object-graph and object-publishing traversal here, but Zope
# 2 has no way to tell us when to use which...
# TODO Perhaps we can decide on object-graph vs.
# object-publishing traversal depending on whether REQUEST is
# a stub or not?
try:
return ITraverser(self).traverse(
path=[name], request=REQUEST).__of__(self)
except (ComponentLookupError, LookupError,
AttributeError, KeyError, NotFound):
pass
raise AttributeError(name)
