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1 ### -*- coding: utf-8 -*- #################################################### |
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2 ############################################################################## |
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3 # |
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4 # Copyright (c) 2008 Thierry Florac <tflorac AT ulthar.net> |
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5 # All Rights Reserved. |
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6 # |
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7 # This software is subject to the provisions of the Zope Public License, |
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8 # Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution. |
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9 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED |
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10 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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11 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS |
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12 # FOR A PARTICULAR PURPOSE. |
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13 # |
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14 ############################################################################## |
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15 """ |
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16 |
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17 $Id: $ |
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18 """ |
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19 |
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20 __version__ = "$Revision: $" |
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21 __release__ = "$Id: $" |
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22 __docformat__ = "restructuredtext" |
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23 |
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24 # import standard packages |
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25 |
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26 # import Zope3 interfaces |
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27 |
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28 # import local interfaces |
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29 |
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30 # import Zope3 packages |
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31 from zope.interface import Interface |
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32 from zope.app import zapi |
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33 |
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34 # import local packages |
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35 |
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36 |
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37 def getParent(context, interface=Interface, allow_context=True): |
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38 """Get first parent of the given context that implements given interface""" |
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39 if allow_context: |
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40 parent = context |
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41 else: |
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42 parent = zapi.getParent(context) |
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43 while parent is not None: |
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44 if interface.providedBy(parent): |
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45 return interface(parent) |
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46 parent = zapi.getParent(parent) |
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47 return None |