38 lines
1.0 KiB
Python
38 lines
1.0 KiB
Python
# Copyright 2015 Canonical Ltd.
|
|
# This file is part of cloud-init. See LICENCE file for license information.
|
|
#
|
|
# vi: ts=4 expandtab
|
|
import copy
|
|
|
|
|
|
class DictRegistry(object):
|
|
"""A simple registry for a mapping of objects."""
|
|
|
|
def __init__(self):
|
|
self.reset()
|
|
|
|
def reset(self):
|
|
self._items = {}
|
|
|
|
def register_item(self, key, item):
|
|
"""Add item to the registry."""
|
|
if key in self._items:
|
|
raise ValueError(
|
|
'Item already registered with key {0}'.format(key))
|
|
self._items[key] = item
|
|
|
|
def unregister_item(self, key, force=True):
|
|
"""Remove item from the registry."""
|
|
if key in self._items:
|
|
del self._items[key]
|
|
elif not force:
|
|
raise KeyError("%s: key not present to unregister" % key)
|
|
|
|
@property
|
|
def registered_items(self):
|
|
"""All the items that have been registered.
|
|
|
|
This cannot be used to modify the contents of the registry.
|
|
"""
|
|
return copy.copy(self._items)
|