Source code for zope.location.traversing

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#
# Copyright (c) 2003-2009 Zope Foundation 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.
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"""Classes to support implenting IContained
"""
__docformat__ = 'restructuredtext'

from zope.interface import implementer

from zope.location.interfaces import ILocationInfo
from zope.location.interfaces import IRoot
from zope.location.interfaces import ISite # zope.component, if present
from zope.location._compat import u


@implementer(ILocationInfo)
[docs]class LocationPhysicallyLocatable(object): """Provide location information for location objects """ def __init__(self, context): self.context = context
[docs] 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")
[docs] 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) 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")
[docs] def getParent(self): """See ILocationInfo. """ parent = getattr(self.context, '__parent__', None) if parent is not None: return parent raise TypeError('Not enough context information to get parent', self.context)
[docs] 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")
[docs] def getName(self): """See ILocationInfo """ return self.context.__name__
[docs] def getNearestSite(self): """See ILocationInfo """ if ISite.providedBy(self.context): return self.context for parent in self.getParents(): if ISite.providedBy(parent): return parent return self.getRoot()
@implementer(ILocationInfo)
[docs]class RootPhysicallyLocatable(object): """Provide location information for the root object This adapter is very simple, because there's no places to search for parents and nearest sites, so we are only working with context object, knowing that its the root object already. """ def __init__(self, context): self.context = context
[docs] def getRoot(self): """See ILocationInfo """ return self.context
[docs] def getPath(self): """See ILocationInfo """ return u('/')
[docs] def getParent(self): """See ILocationInfo. """ return None
[docs] def getParents(self): """See ILocationInfo """ return []
[docs] def getName(self): """See ILocationInfo """ return u('')
[docs] def getNearestSite(self): """See ILocationInfo """ return self.context