4004ebd1cb
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@2513 fd906abe-77d9-0310-91a1-e0d9ade77398
78 lines
2.3 KiB
Python
78 lines
2.3 KiB
Python
#
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# Copyright (c) 2006 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Dictionaries with multiple keys.
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$Id$
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"""
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_not_found = object()
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class MultiKeyDict(object):
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def __init__(self, keylen=None):
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self.keylen = keylen
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self.mapping = {}
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def __setitem__(self, key, value):
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assert type(key) is tuple
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assert len(key) > 0
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if self.keylen is None:
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self.keylen = len(key)
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assert len(key) == self.keylen
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mapping = self.mapping
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for n, k in enumerate(key):
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if n == self.keylen - 1:
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mapping[k] = value
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else:
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mapping = mapping.setdefault(k, {})
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def __getitem__(self, key):
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r = self.get(key, _not_found)
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if r is _not_found:
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raise KeyError(key)
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return r
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def get(self, key, default=None):
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assert type(key) is tuple
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assert len(key) == self.keylen
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mapping = self.mapping
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for k in key:
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entry = mapping.get(k, _not_found)
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if entry == _not_found:
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entry = self._fallback(mapping, k)
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if entry == _not_found:
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return default
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mapping = entry
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return entry
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def _fallback(self, mapping, key):
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return mapping.get(None, _not_found)
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def items(self):
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result = []
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self._step(result, (), self.mapping)
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return tuple(result)
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def _step(self, result, entry, value):
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if len(entry) < self.keylen:
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for k, v in value.items():
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self._step(result, entry+(k,), v)
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else:
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result.append((entry, value))
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