/usr/share/pyshared/schooltool/traverser/traverser.py is in python-schooltool 1:2.1.0-0ubuntu1.
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# SchoolTool - common information systems platform for school administration
# Copyright (c) 2005 Shuttleworth Foundation
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
"""
Pluggable Traverser Implementation
"""
from zope.interface import implements
from zope.component import queryAdapter, queryMultiAdapter
from zope.publisher.interfaces import NotFound
from schooltool.traverser import interfaces
class Traverser(object):
"""A sipmple traverser base."""
implements(interfaces.IPluggableTraverser)
def __init__(self, context, request):
self.context = context
self.request = request
def publishTraverse(self, request, name):
return self.traverse(name)
def traverse(self, name):
raise NotFound(self.context, name, self.request)
class PluggableTraverser(object):
"""Generic Pluggable Traverser."""
implements(interfaces.IPluggableTraverser)
def __init__(self, context, request):
self.context = context
self.request = request
def publishTraverse(self, request, name):
# 1. Look for a named traverser plugin.
named_traverser = queryMultiAdapter((self.context, request),
interfaces.ITraverserPlugin,
name=name)
if named_traverser is not None:
try:
return named_traverser.traverse(name)
except NotFound:
pass
# 2. Named traverser plugin was of no use, let's try a generic one.
traverser = queryMultiAdapter((self.context, request),
interfaces.ITraverserPlugin)
if traverser is not None:
try:
return traverser.traverse(name)
except NotFound:
pass
# 3. The traversers did not have an answer, so let's see whether it is
# a view.
view = queryMultiAdapter((self.context, request), name=name)
if view is not None:
return view
raise NotFound(self.context, name, request)
def browserDefault(self, request):
return self.context, ('index.html', )
class TraverserPlugin(object):
implements(interfaces.ITraverserPlugin)
def __init__(self, context, request):
self.context = context
self.request = request
def traverse(self, name):
raise NotFound(self.context, name, self.request)
class NullTraverserPlugin(TraverserPlugin):
"""Traverse to the context itself (i.e. nowhere)."""
def traverse(self, name):
return self.context
class AttributeTraverserPlugin(TraverserPlugin):
"""Traverse to attributes of the context."""
def traverse(self, name):
try:
obj = getattr(self.context, name)
except AttributeError:
raise NotFound(self.context, name, self.request)
else:
return obj
class AdapterTraverserPlugin(TraverserPlugin):
"""Traverse to an adapter by name."""
interface = None
adapterName = ''
def traverse(self, name):
adapter = queryAdapter(self.context, self.interface,
name=self.adapterName)
if adapter is None:
raise NotFound(self.context, name, self.request)
return adapter
class ContainerTraverserPlugin(TraverserPlugin):
"""A traverser that knows how to look up objects by name in a container."""
def traverse(self, name):
subob = self.context.get(name, None)
if subob is None:
raise NotFound(self.context, name, self.request)
return subob
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