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