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# Copyright (C) 2015 Canonical Ltd.
#
# This file is part of cloud-init. See LICENSE file for license information.
import copy
class DictRegistry:
"""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)
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