dc0993ecc5
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@1226 fd906abe-77d9-0310-91a1-e0d9ade77398
72 lines
2 KiB
Python
72 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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Represent knowledge elements and their interrelations.
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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 IKnowledgeElement
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class KnowledgeElement(object):
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implements(IKnowledgeElement)
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def __init__(self):
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self._parent = None
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self._dependencies = {}
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# backlinks:
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self._children = set()
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self._dependents = set()
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self._knowers = set()
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self._requiringPositions = set()
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self._providers = set()
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def setParent(self, obj):
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old = self._parent
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if old is not None and old != obj:
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del old._children[self]
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if obj is not None and old != obj:
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obj._children.add(self)
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self._parent = obj
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def getParent(self): return self._parent
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parent = property(getParent, setParent)
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def getDependencies(self):
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return self._dependencies
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def dependsOn(self, obj):
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self._dependencies[obj] = True
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obj._dependents.add(self)
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def removeDependency(self, obj):
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del self._dependencies[obj]
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del obj._dependents[self]
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def getDependents(self):
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return self._dependents
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def getKnowers(self):
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return self._knowers
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def getProviders(self):
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return tuple(self._providers)
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