author | Todd Larsen <tlarsen@google.com> |
Thu, 20 Nov 2008 18:06:43 +0000 | |
changeset 511 | 52557918ec8f |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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XML serializer. |
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""" |
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|
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from django.conf import settings |
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from django.core.serializers import base |
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from django.db import models |
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from django.utils.xmlutils import SimplerXMLGenerator |
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from django.utils.encoding import smart_unicode |
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from xml.dom import pulldom |
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|
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class Serializer(base.Serializer): |
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""" |
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Serializes a QuerySet to XML. |
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""" |
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|
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def indent(self, level): |
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if self.options.get('indent', None) is not None: |
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self.xml.ignorableWhitespace('\n' + ' ' * self.options.get('indent', None) * level) |
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|
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def start_serialization(self): |
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""" |
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Start serialization -- open the XML document and the root element. |
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""" |
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self.xml = SimplerXMLGenerator(self.stream, self.options.get("encoding", settings.DEFAULT_CHARSET)) |
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self.xml.startDocument() |
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self.xml.startElement("django-objects", {"version" : "1.0"}) |
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def end_serialization(self): |
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""" |
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End serialization -- end the document. |
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""" |
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self.indent(0) |
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self.xml.endElement("django-objects") |
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self.xml.endDocument() |
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def start_object(self, obj): |
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""" |
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Called as each object is handled. |
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""" |
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if not hasattr(obj, "_meta"): |
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raise base.SerializationError("Non-model object (%s) encountered during serialization" % type(obj)) |
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|
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self.indent(1) |
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self.xml.startElement("object", { |
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"pk" : smart_unicode(obj._get_pk_val()), |
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"model" : smart_unicode(obj._meta), |
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}) |
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def end_object(self, obj): |
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""" |
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Called after handling all fields for an object. |
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""" |
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self.indent(1) |
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self.xml.endElement("object") |
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def handle_field(self, obj, field): |
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""" |
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Called to handle each field on an object (except for ForeignKeys and |
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ManyToManyFields) |
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""" |
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self.indent(2) |
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self.xml.startElement("field", { |
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"name" : field.name, |
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"type" : field.get_internal_type() |
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}) |
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# Get a "string version" of the object's data (this is handled by the |
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# serializer base class). |
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if getattr(obj, field.name) is not None: |
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value = self.get_string_value(obj, field) |
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self.xml.characters(smart_unicode(value)) |
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else: |
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self.xml.addQuickElement("None") |
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self.xml.endElement("field") |
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def handle_fk_field(self, obj, field): |
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""" |
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Called to handle a ForeignKey (we need to treat them slightly |
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differently from regular fields). |
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""" |
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self._start_relational_field(field) |
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related = getattr(obj, field.name) |
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if related is not None: |
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if field.rel.field_name == related._meta.pk.name: |
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# Related to remote object via primary key |
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related = related._get_pk_val() |
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else: |
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# Related to remote object via other field |
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related = getattr(related, field.rel.field_name) |
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self.xml.characters(smart_unicode(related)) |
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else: |
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self.xml.addQuickElement("None") |
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self.xml.endElement("field") |
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def handle_m2m_field(self, obj, field): |
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""" |
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Called to handle a ManyToManyField. Related objects are only |
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serialized as references to the object's PK (i.e. the related *data* |
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is not dumped, just the relation). |
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""" |
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if field.creates_table: |
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self._start_relational_field(field) |
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for relobj in getattr(obj, field.name).iterator(): |
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self.xml.addQuickElement("object", attrs={"pk" : smart_unicode(relobj._get_pk_val())}) |
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self.xml.endElement("field") |
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|
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def _start_relational_field(self, field): |
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""" |
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Helper to output the <field> element for relational fields |
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""" |
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self.indent(2) |
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self.xml.startElement("field", { |
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"name" : field.name, |
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"rel" : field.rel.__class__.__name__, |
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"to" : smart_unicode(field.rel.to._meta), |
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118 |
}) |
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119 |
|
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120 |
class Deserializer(base.Deserializer): |
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""" |
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Deserialize XML. |
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123 |
""" |
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124 |
|
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125 |
def __init__(self, stream_or_string, **options): |
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super(Deserializer, self).__init__(stream_or_string, **options) |
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self.event_stream = pulldom.parse(self.stream) |
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128 |
|
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129 |
def next(self): |
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for event, node in self.event_stream: |
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131 |
if event == "START_ELEMENT" and node.nodeName == "object": |
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self.event_stream.expandNode(node) |
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133 |
return self._handle_object(node) |
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134 |
raise StopIteration |
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135 |
|
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136 |
def _handle_object(self, node): |
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137 |
""" |
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138 |
Convert an <object> node to a DeserializedObject. |
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139 |
""" |
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140 |
# Look up the model using the model loading mechanism. If this fails, |
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141 |
# bail. |
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142 |
Model = self._get_model_from_node(node, "model") |
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143 |
|
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# Start building a data dictionary from the object. If the node is |
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145 |
# missing the pk attribute, bail. |
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146 |
pk = node.getAttribute("pk") |
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147 |
if not pk: |
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148 |
raise base.DeserializationError("<object> node is missing the 'pk' attribute") |
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149 |
|
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data = {Model._meta.pk.attname : Model._meta.pk.to_python(pk)} |
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151 |
|
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152 |
# Also start building a dict of m2m data (this is saved as |
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153 |
# {m2m_accessor_attribute : [list_of_related_objects]}) |
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154 |
m2m_data = {} |
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155 |
|
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156 |
# Deseralize each field. |
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157 |
for field_node in node.getElementsByTagName("field"): |
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158 |
# If the field is missing the name attribute, bail (are you |
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159 |
# sensing a pattern here?) |
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160 |
field_name = field_node.getAttribute("name") |
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161 |
if not field_name: |
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162 |
raise base.DeserializationError("<field> node is missing the 'name' attribute") |
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163 |
|
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164 |
# Get the field from the Model. This will raise a |
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165 |
# FieldDoesNotExist if, well, the field doesn't exist, which will |
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166 |
# be propagated correctly. |
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167 |
field = Model._meta.get_field(field_name) |
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168 |
|
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169 |
# As is usually the case, relation fields get the special treatment. |
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170 |
if field.rel and isinstance(field.rel, models.ManyToManyRel): |
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171 |
m2m_data[field.name] = self._handle_m2m_field_node(field_node, field) |
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172 |
elif field.rel and isinstance(field.rel, models.ManyToOneRel): |
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173 |
data[field.attname] = self._handle_fk_field_node(field_node, field) |
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174 |
else: |
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175 |
if field_node.getElementsByTagName('None'): |
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176 |
value = None |
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177 |
else: |
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178 |
value = field.to_python(getInnerText(field_node).strip()) |
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179 |
data[field.name] = value |
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180 |
|
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181 |
# Return a DeserializedObject so that the m2m data has a place to live. |
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182 |
return base.DeserializedObject(Model(**data), m2m_data) |
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183 |
|
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184 |
def _handle_fk_field_node(self, node, field): |
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185 |
""" |
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186 |
Handle a <field> node for a ForeignKey |
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187 |
""" |
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188 |
# Check if there is a child node named 'None', returning None if so. |
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189 |
if node.getElementsByTagName('None'): |
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190 |
return None |
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191 |
else: |
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192 |
return field.rel.to._meta.get_field(field.rel.field_name).to_python( |
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193 |
getInnerText(node).strip()) |
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194 |
|
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195 |
def _handle_m2m_field_node(self, node, field): |
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196 |
""" |
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197 |
Handle a <field> node for a ManyToManyField. |
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198 |
""" |
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199 |
return [field.rel.to._meta.pk.to_python( |
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200 |
c.getAttribute("pk")) |
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201 |
for c in node.getElementsByTagName("object")] |
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202 |
|
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203 |
def _get_model_from_node(self, node, attr): |
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204 |
""" |
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205 |
Helper to look up a model from a <object model=...> or a <field |
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206 |
rel=... to=...> node. |
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207 |
""" |
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208 |
model_identifier = node.getAttribute(attr) |
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209 |
if not model_identifier: |
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210 |
raise base.DeserializationError( |
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211 |
"<%s> node is missing the required '%s' attribute" \ |
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212 |
% (node.nodeName, attr)) |
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213 |
try: |
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214 |
Model = models.get_model(*model_identifier.split(".")) |
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215 |
except TypeError: |
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216 |
Model = None |
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217 |
if Model is None: |
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218 |
raise base.DeserializationError( |
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219 |
"<%s> node has invalid model identifier: '%s'" % \ |
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220 |
(node.nodeName, model_identifier)) |
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221 |
return Model |
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222 |
|
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223 |
|
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224 |
def getInnerText(node): |
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225 |
""" |
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226 |
Get all the inner text of a DOM node (recursively). |
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227 |
""" |
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228 |
# inspired by http://mail.python.org/pipermail/xml-sig/2005-March/011022.html |
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229 |
inner_text = [] |
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230 |
for child in node.childNodes: |
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231 |
if child.nodeType == child.TEXT_NODE or child.nodeType == child.CDATA_SECTION_NODE: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
232 |
inner_text.append(child.data) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
233 |
elif child.nodeType == child.ELEMENT_NODE: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
234 |
inner_text.extend(getInnerText(child)) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
235 |
else: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
236 |
pass |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
237 |
return u"".join(inner_text) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
238 |