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import json |
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from .attributesholder import AttributesHolder |
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class SerializableAttributesHolder(AttributesHolder): |
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"""AttributesHolder with methods handling serialization and |
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deserialization according to the PPP datamodel specification.""" |
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def as_dict(self): |
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"""Returns a JSON-serializeable object representing this tree.""" |
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def conv(v): |
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if isinstance(v, SerializableAttributesHolder): |
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return v.as_dict() |
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elif isinstance(v, list): |
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return [conv(x) for x in v] |
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elif isinstance(v, dict): |
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return {x:conv(y) for (x,y) in v.items()} |
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else: |
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return v |
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return {k.replace('_', '-'): conv(v) for (k, v) in self._attributes.items()} |
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def as_json(self): |
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"""Return a JSON dump of the object.""" |
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return json.dumps(self.as_dict()) |
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@staticmethod |
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def _test_can_import_json(data): |
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"""Sanity check on input JSON data""" |
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pass |
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@classmethod |
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def from_json(cls, data): |
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"""Decode a JSON string and inflate a node instance.""" |
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# Decode JSON string |
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assert isinstance(data, str) |
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data = json.loads(data) |
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assert isinstance(data, dict) |
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return cls.from_dict(data) |
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@classmethod |
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def from_dict(cls, data): |
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cls._test_can_import_json(data) |
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# Find a class that will deserialize the dict as specifically |
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# as possible |
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while True: |
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cls2 = cls._select_class(data) |
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if cls is cls2: |
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break |
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cls = cls2 |
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conv = (lambda k,v: cls.deserialize_attribute(k, v) |
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if isinstance(v, dict) else v) |
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data = {k.replace('-', '_'): conv(k,v) for (k, v) in data.items()} |
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return cls(**data) |
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@classmethod |
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def deserialize_attribute(cls, key, value): |
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return cls.from_dict(value) |
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@classmethod |
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def _select_class(cls, data): |
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return cls |
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ProjetPP /
PPP-datamodel-Python
