google.appengine.ext.bulkload.simplexml_connector module

Summary

Bulkloader XML reading and writing.

Handle the XML format specified in a bulkloader.yaml file.

Contents

class google.appengine.ext.bulkload.simplexml_connector.SimpleXmlConnector(xpath_to_nodes, xml_style)source

Bases: google.appengine.ext.bulkload.connector_interface.ConnectorInterface

Read/write a simply-structured XML file and convert dicts for each record.

A simply-structed XML file is one where we can locate all interesting nodes with a simple (ElementTree supported) xpath, and each node contains either all the info we care about as child (and not grandchild) nodes with text or as attributes. We'll also pass the entire node in case the developer wants to do something more interesting with it (occasional grandchildren, parents, etc.).

This is of course a fairly expensive way to read XML--we build a DOM, then copy parts of it into a dict. A pull model would work well with the interface too.

ATTRIBUTE_CENTRIC = 2
ELEMENT_CENTRIC = 1
classmethod create_from_options(options, name)source

Factory using an options dictionary.

Parameters
  • options -- Dictionary of options. Must contain: * xpath_to_nodes: The xpath to select a record. * style: 'element_centric' or 'attribute_centric'

  • name -- The name of this transformer, for use in error messages.

Returns

XmlConnector connector object described by the specified options.

Raises

InvalidConfiguration -- If the config is invalid.

finalize_export()source
generate_import_record(filename, bulkload_state)source

Generator, yields dicts for nodes found as described in the options.

initialize_export(filename, bulkload_state)source

Initialize the output file.

write_dict(dictionary)source

Write one record for the specified entity.

write_iterable_as_elements(values)source

Write a dict as elements, possibly recursively.

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