"""
Serialize data to/from JSON
"""
import datetime
from StringIO import StringIO
from django.core.serializers.python import Serializer
from django.core.serializers.python import Deserializer
from django.utils import datetime_safe
from django.utils import simplejson
try:
import decimal
except ImportError:
from django.utils import _decimal
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)
self.options.pop('use_natural_keys', 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), **options):
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
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