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"""Contains the class representing a triple node.""" |
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2
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3
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from .abstractnode import register, AbstractNode |
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from .list import List |
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6
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@register |
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7
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class Triple(AbstractNode): |
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"""Represents a triple. |
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https://github.com/ProjetPP/Documentation/blob/master/data-model.md#triple |
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""" |
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11
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__slots__ = () |
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_type = 'triple' |
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_possible_attributes = ('subject', 'predicate', 'object', 'inverse_predicate') |
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15
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def _check_attributes(self, attributes): |
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attributes['inverse_predicate'] = \ |
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attributes.get('inverse_predicate', List([])) |
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super(Triple, self)._check_attributes(attributes) |
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if not all(isinstance(x, AbstractNode) for x in attributes.values()): |
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raise TypeError('One of Triple\'s constructor argument ' |
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'is not an AbstractNode instance.') |
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23
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def as_dict(self): |
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"""Do not put inverse-predicate in the output dict if it |
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is an empty list.""" |
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d = super(Triple, self).as_dict() |
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if d['inverse-predicate']['type'] == 'list' and \ |
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d['inverse-predicate']['list'] == []: |
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del d['inverse-predicate'] |
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return d |
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31
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32
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@property |
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def predicate_set(self): |
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"""Return a frozenset of predicates, extracting it from the list |
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if it is a List node.""" |
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if isinstance(self.predicate, List): |
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return frozenset(self.predicate.list) |
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else: |
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return frozenset({self.predicate}) |
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40
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41
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@property |
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def inverse_predicate_set(self): |
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"""Return a frozenset of inverse predicates, extracting it from the list |
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if it is a List node.""" |
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if isinstance(self.inverse_predicate, List): |
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return frozenset(self.inverse_predicate.list) |
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else: |
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return frozenset({self.inverse_predicate}) |
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49
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50
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def inverse(self): |
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return self.__class__(self.object, self.inverse_predicate, |
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self.subject, self.predicate) |
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ProjetPP /
PPP-datamodel-Python
