47 lines
1.9 KiB
Python
47 lines
1.9 KiB
Python
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# indexed_dict.py
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# Implements IndexedDictionary class.
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#
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# Copyright (C) 2009 Red Hat, Inc.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions of
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# the GNU General Public License v.2, or (at your option) any later version.
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY expressed or implied, including the implied warranties of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details. You should have received a copy of the
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# GNU General Public License along with this program; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA. Any Red Hat trademarks that are incorporated in the
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# source code or documentation are not subject to the GNU General Public
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# License and may only be used or replicated with the express permission of
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# Red Hat, Inc.
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#
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class IndexedDict(dict):
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""" Indexed dictionary that remembers order of the inserted elements.
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Values can be inserted with string keys only, but referenced by both
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string keys or index.
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There's a unit test for the class, please maintain it along.
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"""
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def __init__(self):
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super(IndexedDict, self).__init__()
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self._indexes = []
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def __getitem__(self, key):
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if type(key) is int:
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key = self._indexes[key]
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return super(IndexedDict, self).__getitem__(key)
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def __setitem__(self, key, value):
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if type(key) is int:
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raise TypeError("IndexedDict only accepts strings as new keys")
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assert(len(self) == len(self._indexes))
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self._indexes.append(key)
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return super(IndexedDict, self).__setitem__(key, value)
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def index(self, string_key):
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return self._indexes.index(string_key)
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