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Viewing changes to MoinMoin/datastruct/backends/composite_dicts.py

  • Committer: Bazaar Package Importer
  • Author(s): Jonas Smedegaard
  • Date: 2008-06-22 21:17:13 UTC
  • mto: This revision was merged to the branch mainline in revision 18.
  • Revision ID: james.westby@ubuntu.com-20080622211713-inlv5k4eifxckelr
Import upstream version 1.7.0

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MoinMoin/datastruct/backends/composite_dicts.py
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# -*- coding: iso-8859-1 -*-
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"""
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MoinMoin - dict access via various backends.
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@copyright: 2009 DmitrijsMilajevs
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@license: GPL, see COPYING for details
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"""
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from MoinMoin.datastruct.backends import BaseDictsBackend, DictDoesNotExistError
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class CompositeDicts(BaseDictsBackend):
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    """
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    Manage several dicts backends.
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    """
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    def __init__(self, request, *backends):
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        """
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        @param backends: list of dict backends which are used to get
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                         access to the dict definitions.
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        """
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        super(CompositeDicts, self).__init__(request)
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        self._backends = backends
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    def __getitem__(self, dict_name):
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        """
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        Get a dict by its name. First match counts.
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        """
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        for backend in self._backends:
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            try:
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                return backend[dict_name]
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            except DictDoesNotExistError:
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                pass
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        raise DictDoesNotExistError(dict_name)
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    def __contains__(self, dict_name):
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        """
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        Check if a dict called dict_name is available in any of the backends.
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        """
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        for backend in self._backends:
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            if dict_name in backend:
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                return True
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        return False
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    def __repr__(self):
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        return "<%s backends=%s>" % (self.__class__, self._backends)
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