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'''
Created on Jun 19, 2011
@author: leifj
'''
from tastypie.serializers import Serializer, get_type_string
from lxml.etree import Element
from tastypie.bundle import Bundle
from tastypie.fields import ApiField, ToOneField, ToManyField
from django.utils.encoding import force_unicode
import logging
from pprint import pformat
class OpenSocialSerializer(Serializer):
def __init__(self, formats=None, content_types=None, datetime_formatting=None):
super(OpenSocialSerializer,self).__init__(formats,content_types,datetime_formatting)
def to_etree(self, data, options=None, name=None, depth=0):
#logging.debug("--------")
#logging.debug(name)
#logging.debug(depth)
#logging.debug(pformat(data))
"""
Given some data, converts that data to an ``etree.Element`` suitable
for use in the XML output.
"""
if isinstance(data, (list, tuple)):
element = Element(name or 'objects')
if name:
element = Element(name)
#element.set('type', 'list')
else:
element = Element('objects')
for item in data:
element.append(self.to_etree(item, options, depth=depth+1))
elif isinstance(data, dict):
if depth == 0:
element = Element(name or 'response',attrib={'xmlns': "http://ns.opensocial.org/2008/opensocial"} )
else:
element = Element(name or 'object')
element.set('type', 'hash')
if data.has_key('objects'):
if len(data['objects']) == 1:
return self.to_etree(data['objects'][0], options, name=None, depth=depth)
else:
for v in data['objects']:
element.append(self.to_etree(v, options, name='entry', depth=depth+1))
else:
for (key, value) in data.iteritems():
keyname = key
if keyname == 'user':
keyname = 'person'
element.append(self.to_etree(value, options, name=keyname, depth=depth+1))
elif isinstance(data, Bundle):
element = Element(name or 'object')
for field_name, field_object in data.data.items():
keyname = field_name
if keyname == 'user':
keyname = 'person'
element.append(self.to_etree(field_object, options, name=keyname, depth=depth+1))
elif isinstance(data, ApiField):
if isinstance(data, ToOneField):
if data.full:
return self.to_etree(data.fk_resource, options, name, depth+1)
else:
return self.to_etree(data.value, options, name, depth+1)
elif isinstance(data, ToManyField):
if data.full:
element = Element(name or 'objects')
for bundle in data.m2m_bundles:
element.append(self.to_etree(bundle, options, bundle.resource_name, depth+1))
else:
element = Element(name or 'objects')
for value in data.value:
element.append(self.to_etree(value, options, name, depth=depth+1))
else:
return self.to_etree(data.value, options, name)
else:
element = Element(name or 'value')
simple_data = self.to_simple(data, options)
data_type = get_type_string(simple_data)
if data_type != 'string':
element.set('type', get_type_string(simple_data))
if data_type != 'null':
element.text = force_unicode(simple_data)
return element
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