author | Pawel Solyga <Pawel.Solyga@gmail.com> |
Sat, 24 Jan 2009 10:57:53 +0000 | |
changeset 946 | db4134853d64 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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Serialize data to/from JSON |
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""" |
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import datetime |
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parents:
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from StringIO import StringIO |
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parents:
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from django.core.serializers.python import Serializer as PythonSerializer |
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from django.core.serializers.python import Deserializer as PythonDeserializer |
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parents:
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from django.utils import datetime_safe |
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parents:
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from django.utils import simplejson |
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parents:
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try: |
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import decimal |
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except ImportError: |
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from django.utils import _decimal as decimal # Python 2.3 fallback |
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class Serializer(PythonSerializer): |
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""" |
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Convert a queryset to JSON. |
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""" |
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internal_use_only = False |
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def end_serialization(self): |
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self.options.pop('stream', None) |
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self.options.pop('fields', None) |
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simplejson.dump(self.objects, self.stream, cls=DjangoJSONEncoder, **self.options) |
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def getvalue(self): |
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if callable(getattr(self.stream, 'getvalue', None)): |
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return self.stream.getvalue() |
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def Deserializer(stream_or_string, **options): |
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""" |
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Deserialize a stream or string of JSON data. |
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""" |
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if isinstance(stream_or_string, basestring): |
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stream = StringIO(stream_or_string) |
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else: |
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stream = stream_or_string |
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for obj in PythonDeserializer(simplejson.load(stream)): |
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yield obj |
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class DjangoJSONEncoder(simplejson.JSONEncoder): |
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""" |
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JSONEncoder subclass that knows how to encode date/time and decimal types. |
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""" |
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DATE_FORMAT = "%Y-%m-%d" |
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TIME_FORMAT = "%H:%M:%S" |
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def default(self, o): |
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if isinstance(o, datetime.datetime): |
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d = datetime_safe.new_datetime(o) |
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return d.strftime("%s %s" % (self.DATE_FORMAT, self.TIME_FORMAT)) |
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elif isinstance(o, datetime.date): |
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d = datetime_safe.new_date(o) |
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return d.strftime(self.DATE_FORMAT) |
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elif isinstance(o, datetime.time): |
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return o.strftime(self.TIME_FORMAT) |
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elif isinstance(o, decimal.Decimal): |
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return str(o) |
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else: |
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return super(DjangoJSONEncoder, self).default(o) |
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# Older, deprecated class name (for backwards compatibility purposes). |
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DateTimeAwareJSONEncoder = DjangoJSONEncoder |
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