242c4a4921
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@1845 fd906abe-77d9-0310-91a1-e0d9ade77398
132 lines
3.8 KiB
Python
132 lines
3.8 KiB
Python
#
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# Copyright (c) 2007 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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A general purpose (thus 'Jeep') class that provides most of the interfaces
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of sequences and dictionaries and in addition allows attribute access to
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the dictionary entries.
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This is the Zope-based persistent variant of the Jeep class.
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$Id$
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"""
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from persistent import Persistent
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from persistent.list import PersistentList
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from BTrees.OOBTree import OOBTree
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from zope.app.container.interfaces import IContainer
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from zope.interface import implements
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_notfound = object()
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_nodefault = object()
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class Jeep(Persistent):
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implements(IContainer)
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_attributes = ('_sequence', '_mapping')
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def __init__(self, seq=[]):
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sequence = self._sequence = PersistentList()
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mapping = self._mapping = OOBTree()
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for attr, value in seq:
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sequence.append(attr)
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mapping[attr] = value
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def __len__(self):
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return len(self._sequence)
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def __iter__(self):
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for key in self._sequence:
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yield self[key]
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def __getattr__(self, attr, default=_nodefault):
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value = self._mapping.get(attr, _notfound)
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if value is _notfound:
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if default is _nodefault:
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raise AttributeError(attr)
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else:
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return default
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return value
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def __setattr__(self, attr, value):
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if attr in self._attributes:
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super(Jeep, self).__setattr__(attr, value)
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else:
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if getattr(self, attr, _notfound) is _notfound:
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self._sequence.append(attr)
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self._mapping[attr] = value
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def __delattr__(self, attr):
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del self._sequence[self.index(attr)]
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del self._mapping[attr]
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def __getitem__(self, key):
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if type(key) in (int, long):
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return getattr(self, self._sequence[key])
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value = getattr(self, key, _notfound)
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if value is _notfound:
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raise KeyError(key)
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return value
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def __setitem__(self, key, value):
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setattr(self, key, value)
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def __delitem__(self, key):
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delattr(self, key)
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def __contains__(self, key):
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return getattr(self, key, _notfound) is not _notfound
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has_key = __contains__
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def keys(self):
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return [key for key in self._sequence]
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def values(self):
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return list(self)
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def items(self):
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return [(k, self[k]) for k in self._sequence]
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def get(self, key, default=None):
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return getattr(self, key, default)
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def index(self, key):
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return self._sequence.index(key)
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def append(self, obj):
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self.insert(len(self), obj)
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def insert(self, idx, obj):
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key = getattr(obj, '__name__', getattr(obj, 'name', _notfound))
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if key is _notfound:
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raise AttributeError("No name attribute present")
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if key in self:
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raise ValueError("Object already present")
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self._sequence.insert(idx, key)
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self._mapping[key] = obj
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def pop(self, key=-1):
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value = self[key]
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if type(key) in (int, long):
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key = self._sequence[key]
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delattr(self, key)
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return value
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