def topics(form, tree, namespaces):
"""
TODO Add term to form so not necessary to hit Tematres server during save
http://r020.com.ar/tematres/demo/xml.php?jsonTema=256|Lenguajes monomediales
http://r020.com.ar/tematres/demo/xml.php?jsonTema=512|Telecomunicaciones
http://r020.com.ar/tematres/demo/xml.php?jsonTema=1024|cell
"""
# <mods:subject>
# <mods:topic xlink:href=""></mods:topic>
# </mods:subject>
xpath = "/mets:mets/mets:dmdSec[@ID='DM1']/mets:mdWrap/mets:xmlData/mods:mods/mods:subject/mods:topic"
form_urls = [t.strip() for t in form.cleaned_data['topic'].split(';')]
topics = []
# TODO Don't follow URLs for terms that have not changed.
# TODO Cache tematres requests?
terms = tematres.get_terms(form_urls)
# remove existing tags
parent = None
for tag in tree.xpath(xpath, namespaces=NAMESPACES):
parent = tag.getparent()
parent.remove(tag)
# replace with new tags
for href,term in terms:
tag_name = xmlforms.expand_attrib_namespace('mods:topic', namespaces)
attr_name = xmlforms.expand_attrib_namespace('xlink:href', namespaces)
child = etree.Element(tag_name)
child.set(attr_name, href)
child.text = term
parent.append(child)
return tree
def load_mods_topics(tag):
"""Extract topics from etree tag and return Python objects.
"""
topics = []
for topic in tag:
attr = xmlforms.expand_attrib_namespace('xlink:href', NAMESPACES)
topics.append((topic.get(attr), topic.text))
return topics
