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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
serialization.py
~~~~~~~~~~~~~~~~
json serialization
:copyright: (c) 2013 by Jauhien Piatlicki
:license: GPL-2, see LICENSE for more details.
"""
import json
import importlib
class JSONSerializer(json.JSONEncoder):
"""
Custom JSON encoder.
Each serializable class should have a method serialize
that returns JSON serializable value. If class addfitionally
has a classmethod deserialize that it can be deserialized
and additional metainformation is added to the resulting JSON.
"""
def default(self, obj):
if hasattr(obj, "serialize"):
if hasattr(obj, "deserialize"):
module = obj.__class__.__module__
name = obj.__class__.__name__
value = obj.serialize()
return {"python_module" : module,
"python_class" : name,
"value" : value}
else:
return obj.serialize()
return json.JSONEncoder.default(self, obj)
def deserializeHook(json_object):
"""
Custom JSON decoder.
Each class that can be deserialized should have classmethod deserialize
that takes value (previously returned by serialize method) and transforms
it into class instance.
"""
if "python_class" in json_object:
module = importlib.import_module(json_object["python_module"])
cls = getattr(module, json_object["python_class"])
return cls.deserialize(json_object["value"])
return json_object
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