cc1b0e4585
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@1227 fd906abe-77d9-0310-91a1-e0d9ade77398
67 lines
2 KiB
Python
67 lines
2 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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Manage objects (people) who know something.
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$Id$
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"""
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from zope.interface import implements
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from cybertools.knowledge.interfaces import IKnowing
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class Knowing(object):
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implements(IKnowing)
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def __init__(self):
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self._knowledge = {}
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def getKnowledge(self):
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return self._knowledge
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def knows(self, obj):
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self._knowledge[obj] = True
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obj._knowers.add(self)
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def removeKnowledge(self, obj):
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del self._knowledge[obj]
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del obj._knowers[self]
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def getMissingKnowledge(self, position):
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knowledge = self.getKnowledge()
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missing = []
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toCheck = [k for k in position.getRequirements() if k not in knowledge]
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while toCheck:
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k = toCheck.pop()
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missing.insert(0, k)
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for d in k.getDependencies():
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if d in knowledge or k in toCheck:
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continue
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if d in missing:
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# TODO: rearrange missing, but care for cycles...
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continue
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toCheck.append(d)
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return tuple(missing)
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def getProvidersNeeded(self, position):
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return ((k, k.getProviders())
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for k in self.getMissingKnowledge(position))
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