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# Copyright: 2005 Gentoo Foundation
# Author(s): Brian Harring (ferringb@gentoo.org)
# License: GPL2
# $Header: /local/data/ulm/cvs/history/var/cvsroot/gentoo-src/portage/portage/package/metadata.py,v 1.2 2005/07/13 05:51:35 ferringb Exp $
import weakref
from cpv import CPV
class package(CPV):
def __init__(self, cpv, parent_repository):
super(package,self).__init__(cpv)
self.__dict__["_cpv_finalized"] = False
# self.__dict__["_finalized"] = False
self.__dict__["_parent"] = parent_repository
def __setattr__(self, *args, **kwargs):
raise AttributeError
def __delattr__(self, *args, **kwargs):
raise AttributeError
def __getitem__(self, key):
try: return getattr(self,key)
except AttributeError:
raise KeyError(key)
def __getattr__(self, attr):
if not self._cpv_finalized:
try: return super(package,self).__getattr__(attr)
except AttributeError:
#enable this when CPV does it.
#self.__cpv_finalized = True
pass
# assuming they're doing super, if it ain't data it's an error (no other jit attr)
if attr != "data":
raise AttributeError, attr
# if self._finalized:
# raise AttributeError, attr
# if we've made it here, then more is needed.
data = self._fetch_metadata()
self.__dict__["data"] = data
return data
# self.__dict__["_finalized"] = True
# if attr in self.__dict__:
# return self.__dict__[attr]
# raise AttributeError,attr
def _fetch_metadata(self):
raise NotImplementedError
class factory(object):
child_class = package
def __init__(self, parent_repo):
self._parent_repo = parent_repo
self._cached_instances = weakref.WeakValueDictionary()
def new_package(self, cpv):
if cpv in self._cached_instances:
return self._cached_instances[cpv]
d = self._get_new_child_data(cpv)
m = self.child_class(cpv, self, *d[0], **d[1])
self._cached_instances[cpv] = m
return m
def clear(self):
self._cached_instances.clear()
def _load_package_metadata(self, inst):
raise NotImplementedError
def __del__(self):
self.clear()
def _get_metadata(self, *args):
raise NotImplementedError
def _update_metadata(self, *args):
raise NotImplementedError
def _get_new_child_data(self, cpv):
"""return pargs,kwargs for any new children generated by this factory.
defaults to [], {}
Probably will be rolled into a class/instance attribute whenever someone cleans this up"""
return ([],{})
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