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- ##############################################################################
- #
- # Zope Public License (ZPL) Version 1.0
- # -------------------------------------
- #
- # Copyright (c) Digital Creations. All rights reserved.
- #
- # This license has been certified as Open Source(tm).
- #
- # Redistribution and use in source and binary forms, with or without
- # modification, are permitted provided that the following conditions are
- # met:
- #
- # 1. Redistributions in source code must retain the above copyright
- # notice, this list of conditions, and the following disclaimer.
- #
- # 2. Redistributions in binary form must reproduce the above copyright
- # notice, this list of conditions, and the following disclaimer in
- # the documentation and/or other materials provided with the
- # distribution.
- #
- # 3. Digital Creations requests that attribution be given to Zope
- # in any manner possible. Zope includes a "Powered by Zope"
- # button that is installed by default. While it is not a license
- # violation to remove this button, it is requested that the
- # attribution remain. A significant investment has been put
- # into Zope, and this effort will continue if the Zope community
- # continues to grow. This is one way to assure that growth.
- #
- # 4. All advertising materials and documentation mentioning
- # features derived from or use of this software must display
- # the following acknowledgement:
- #
- # "This product includes software developed by Digital Creations
- # for use in the Z Object Publishing Environment
- # (http://www.zope.org/)."
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- # In the event that the product being advertised includes an
- # intact Zope distribution (with copyright and license included)
- # then this clause is waived.
- #
- # 5. Names associated with Zope or Digital Creations must not be used to
- # endorse or promote products derived from this software without
- # prior written permission from Digital Creations.
- #
- # 6. Modified redistributions of any form whatsoever must retain
- # the following acknowledgment:
- #
- # "This product includes software developed by Digital Creations
- # for use in the Z Object Publishing Environment
- # (http://www.zope.org/)."
- #
- # Intact (re-)distributions of any official Zope release do not
- # require an external acknowledgement.
- #
- # 7. Modifications are encouraged but must be packaged separately as
- # patches to official Zope releases. Distributions that do not
- # clearly separate the patches from the original work must be clearly
- # labeled as unofficial distributions. Modifications which do not
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- # conform to all of the clauses above.
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- #
- # Disclaimer
- #
- # THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS ``AS IS'' AND ANY
- # EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DIGITAL CREATIONS OR ITS
- # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- # ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- # OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- # SUCH DAMAGE.
- #
- #
- # This software consists of contributions made by Digital Creations and
- # many individuals on behalf of Digital Creations. Specific
- # attributions are listed in the accompanying credits file.
- #
- ##############################################################################
- __doc__='''Python implementation of persistent base types
-
-
- $Id: PersistentMapping.py,v 1.8 2000/04/21 20:06:34 jim Exp $'''
- __version__='$Revision: 1.8 $'[11:-2]
-
- import Persistence
- import types
-
- _marker=[]
- class PersistentMapping(Persistence.Persistent):
- """A persistent wrapper for mapping objects.
-
- This class allows wrapping of mapping objects so that
- object changes are registered. As a side effect,
- mapping objects may be subclassed.
- """
-
- def __init__(self,container=None):
- if container is None: container={}
- self._container=container
-
- def __delitem__(self, key):
- del self._container[key]
- try: del self._v_keys
- except: pass
- self.__changed__(1)
-
- def __getitem__(self, key):
- return self._container[key]
-
- def __len__(self): return len(self._container)
-
- def __setitem__(self, key, v):
- self._container[key]=v
- try: del self._v_keys
- except: pass
- self.__changed__(1)
-
- def clear(self):
- self._container.clear()
- self._p_changed=1
- if hasattr(self,'_v_keys'): del self._v_keys
-
- def copy(self): return self.__class__(self._container.copy())
-
- def get(self, key, default=_marker):
- if default is _marker:
- return self._container.get(key)
- else:
- return self._container.get(key, default)
-
- def has_key(self,key): return self._container.has_key(key)
-
- def items(self):
- return map(lambda k, d=self: (k,d[k]), self.keys())
-
- def keys(self):
- try: return self._v_keys
- except: pass
- keys=self._v_keys=filter(
- lambda k: not isinstance(k,types.StringType) or k[:1]!='_',
- self._container.keys())
- keys.sort()
- return keys
-
- def update(self, b):
- a=self._container
- for k, v in b.items(): a[k] = v
- self._p_changed=1
-
- def values(self):
- return map(lambda k, d=self: d[k], self.keys())
-
-