51 lines
1.3 KiB
Python
51 lines
1.3 KiB
Python
# cybertools.knowledge.element
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""" Represent knowledge elements and their interrelations.
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"""
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from zope.interface import implementer
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from cybertools.knowledge.interfaces import IKnowledgeElement
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@implementer(IKnowledgeElement)
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class KnowledgeElement(object):
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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._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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