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from .attributesholder import AttributesHolder |
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class TypedAttributesHolder(AttributesHolder): |
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"""AttributesHolder with a special attributes holding type.""" |
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__slots__ = () |
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_type = None |
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def __init__(self, *args, **attributes): |
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# Sanity checks |
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if self._type is None or self._possible_attributes is None: |
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raise TypeError('%s is an abstract class.' % self.__class__) |
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super(TypedAttributesHolder, self).__init__(*args, **attributes) |
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self._attributes['type'] = self.type |
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def _check_attributes(self, attributes, extra=None): |
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if 'type' in attributes: |
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assert attributes.pop('type') == self.type |
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return super(TypedAttributesHolder, self) \ |
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._check_attributes(attributes, extra) |
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@property |
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def type(self): |
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"""Type of the node.""" |
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return self._type |
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def __repr__(self): |
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return '<PPP node "%s" %r>' % (self.type, |
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{x:y for (x,y) in self._attributes.items() if x != 'type'}) |
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def __eq__(self, other): |
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"""Tests equality with another AttributesHolder instance.""" |
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if isinstance(other, dict): |
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return self.as_dict() == other |
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elif isinstance(other, TypedAttributesHolder) and \ |
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self._type == other._type: |
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return super(TypedAttributesHolder, self).__eq__(other) |
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else: |
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return NotImplemented |
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def __hash__(self): |
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return hash(frozenset(self._attributes.items())) |
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ProjetPP /
PPP-datamodel-Python
