def getParent(obj):
"""
Returns the container the object was traversed via.
See `ITraversalAPI` for details.
"""
try:
location_info = ILocationInfo(obj)
except TypeError:
pass
else:
return location_info.getParent()
# XXX Keep the old implementation as the fallback behaviour in the case
# that obj doesn't have a location parent. This seems advisable as the
# 'parent' is sometimes taken to mean the traversal parent, and the
# __parent__ attribute is used for both.
if IRoot.providedBy(obj):
return None
parent = getattr(obj, '__parent__', None)
if parent is not None:
return parent
raise TypeError("Not enough context information to get parent", obj)
def getParent(obj):
"""Returns the container the object was traversed via.
Returns None if the object is a containment root.
Raises TypeError if the object doesn't have enough context to get the
parent.
"""
try:
location_info = ILocationInfo(obj)
except TypeError:
pass
else:
return location_info.getParent()
# XXX Keep the old implementation as the fallback behaviour in the case
# that obj doesn't have a location parent. This seems advisable as the
# 'parent' is sometimes taken to mean the traversal parent, and the
# __parent__ attribute is used for both.
if IRoot.providedBy(obj):
return None
parent = getattr(obj, '__parent__', None)
if parent is not None:
return parent
raise TypeError("Not enough context information to get parent", obj)
def getRoot(self):
"""Get the root location for a location.
See ILocationInfo
The root location is a location that contains the given
location and that implements IContainmentRoot.
>>> root = Location()
>>> zope.interface.directlyProvides(root, IRoot)
>>> LocationPhysicallyLocatable(root).getRoot() is root
True
>>> o1 = Location(); o1.__parent__ = root
>>> LocationPhysicallyLocatable(o1).getRoot() is root
True
>>> o2 = Location(); o2.__parent__ = o1
>>> LocationPhysicallyLocatable(o2).getRoot() is root
True
We'll get a TypeError if we try to get the location fo a
rootless object:
>>> o1.__parent__ = None
>>> LocationPhysicallyLocatable(o1).getRoot()
Traceback (most recent call last):
...
TypeError: Not enough context to determine location root
>>> LocationPhysicallyLocatable(o2).getRoot()
Traceback (most recent call last):
...
TypeError: Not enough context to determine location root
If we screw up and create a location cycle, it will be caught:
>>> o1.__parent__ = o2
>>> LocationPhysicallyLocatable(o1).getRoot()
Traceback (most recent call last):
...
TypeError: Maximum location depth exceeded, """ \
"""probably due to a a location cycle.
"""
context = self.context
max = 9999
while context is not None:
if IRoot.providedBy(context):
return context
context = context.__parent__
max -= 1
if max < 1:
raise TypeError("Maximum location depth exceeded, "
"probably due to a a location cycle.")
raise TypeError("Not enough context to determine location root")
def getRoot(self):
"""See ILocationInfo.
"""
context = self.context
max = 9999
while context is not None:
if IRoot.providedBy(context):
return context
context = context.__parent__
max -= 1
if max < 1:
raise TypeError("Maximum location depth exceeded, "
"probably due to a a location cycle.")
raise TypeError("Not enough context to determine location root")
def getRoot(self):
"""See ILocationInfo.
"""
context = self.context
max = 9999
while context is not None:
if IRoot.providedBy(context):
return context
context = context.__parent__
max -= 1
if max < 1:
raise TypeError("Maximum location depth exceeded, "
"probably due to a a location cycle.")
raise TypeError("Not enough context to determine location root")
def getParents(self):
"""See ILocationInfo.
"""
# XXX Merge this implementation with getPath. This was refactored
# from zope.traversing.
parents = []
w = self.context
while 1:
w = getattr(w, '__parent__', None)
if w is None:
break
parents.append(w)
if parents and IRoot.providedBy(parents[-1]):
return parents
raise TypeError("Not enough context information to get all parents")
def getParents(self):
"""See ILocationInfo.
"""
# XXX Merge this implementation with getPath. This was refactored
# from zope.traversing.
parents = []
w = self.context
while 1:
w = getattr(w, '__parent__', None)
if w is None:
break
parents.append(w)
if parents and IRoot.providedBy(parents[-1]):
return parents
raise TypeError("Not enough context information to get all parents")
def get_parent(obj, default=_marker):
"""Returns the container the object was traversed via.
Returns None if the object is a containment root.
Raises TypeError if the object doesn't have enough context to get the
parent.
"""
if IRoot.providedBy(obj):
return None
parent = aq_parent(aq_inner(obj))
if parent is not None:
return parent
if default != _marker:
return default
raise TypeError("Not enough context information to get parent", obj)
def getPath(self):
"""See ILocationInfo.
"""
path = []
context = self.context
max = 9999
while context is not None:
if IRoot.providedBy(context):
if path:
path.append('')
path.reverse()
return u'/'.join(path)
return u'/'
path.append(context.__name__)
context = context.__parent__
max -= 1
if max < 1:
raise TypeError("Maximum location depth exceeded, "
"probably due to a a location cycle.")
raise TypeError("Not enough context to determine location root")
def getPath(self):
"""See ILocationInfo.
"""
path = []
context = self.context
max = 9999
while context is not None:
if IRoot.providedBy(context):
if path:
path.append('')
path.reverse()
return u'/'.join(path)
return u'/'
path.append(context.__name__)
context = context.__parent__
max -= 1
if max < 1:
raise TypeError("Maximum location depth exceeded, "
"probably due to a a location cycle.")
raise TypeError("Not enough context to determine location root")
def getParents(self):
"""Returns a list starting with the object's parent followed by
each of its parents.
Raises a TypeError if the object is not connected to a containment
root.
>>> root = Location()
>>> zope.interface.directlyProvides(root, IRoot)
>>> o1 = Location()
>>> o2 = Location()
>>> o1.__parent__ = root
>>> o2.__parent__ = o1
>>> LocationPhysicallyLocatable(o2).getParents() == [o1, root]
True
If the last parent is not an IRoot object, TypeError will be
raised as statet before.
>>> zope.interface.noLongerProvides(root, IRoot)
>>> LocationPhysicallyLocatable(o2).getParents()
Traceback (most recent call last):
...
TypeError: Not enough context information to get all parents
"""
# XXX Merge this implementation with getPath. This was refactored
# from zope.traversing.
parents = []
w = self.context
while 1:
w = w.__parent__
if w is None:
break
parents.append(w)
if parents and IRoot.providedBy(parents[-1]):
return parents
raise TypeError("Not enough context information to get all parents")
def getPath(self):
"""Get the path of a location.
See ILocationInfo
This is an "absolute path", rooted at a root object.
>>> root = Location()
>>> zope.interface.directlyProvides(root, IRoot)
>>> LocationPhysicallyLocatable(root).getPath()
u'/'
>>> o1 = Location(); o1.__parent__ = root; o1.__name__ = 'o1'
>>> LocationPhysicallyLocatable(o1).getPath()
u'/o1'
>>> o2 = Location(); o2.__parent__ = o1; o2.__name__ = u'o2'
>>> LocationPhysicallyLocatable(o2).getPath()
u'/o1/o2'
It is an error to get the path of a rootless location:
>>> o1.__parent__ = None
>>> LocationPhysicallyLocatable(o1).getPath()
Traceback (most recent call last):
...
TypeError: Not enough context to determine location root
>>> LocationPhysicallyLocatable(o2).getPath()
Traceback (most recent call last):
...
TypeError: Not enough context to determine location root
If we screw up and create a location cycle, it will be caught:
>>> o1.__parent__ = o2
>>> LocationPhysicallyLocatable(o1).getPath()
Traceback (most recent call last):
...
TypeError: Maximum location depth exceeded, """ \
"""probably due to a a location cycle.
"""
path = []
context = self.context
max = 9999
while context is not None:
if IRoot.providedBy(context):
if path:
path.append('')
path.reverse()
return u'/'.join(path)
else:
return u'/'
path.append(context.__name__)
context = context.__parent__
max -= 1
if max < 1:
raise TypeError("Maximum location depth exceeded, "
"probably due to a a location cycle.")
raise TypeError("Not enough context to determine location root")
