/
models.py
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/
models.py
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# -*- coding:utf-8 -*-
from django.db import models
from django.contrib.contenttypes.models import ContentType
from django_extensions.db import fields as exfields
from django.utils.translation import ugettext_lazy as _
import surf, rdflib
from surf import ns
from surf.query import select,a
from urllib2 import Request, urlopen, URLError, HTTPError
#from djutils.decorators import async
import settings
import re
import os.path
def literal_lang_select(list):
'''
Ou 'list' est une liste de rdflib.term.literal
'''
result = None
pref_lang = 'fr' #TODO livesettings
fallback = 'en'
for literal in list:
if(literal.language == pref_lang):
result = unicode(literal)
break
elif(literal.language == fallback):
result = unicode(literal)
elif(not result):
result = unicode(literal)
return(' '.join(result.split()))
#@async
def download_schema(uri, prefix):
headers = { "Accept": "text/turtle,text/n3,text/rdf+n3,application/rdf+xml,text/rdf,text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5",
"Accept-Language": "en-us,en;q=0.5",
"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7",
"User-Agent": "django-d2rq"
}
req = Request(uri,None,headers)
try:
handle = urlopen(req)
except URLError, e:
print 'La connexion avec le serveur a échoué.'
print 'Raison: ', e.reason
except HTTPError, e:
print 'Erreur du serveur.'
print 'Code : ', e.code
format = handle.info().gettype()
formats = { 'application/rdf+xml':'rdf','text/turtle' : 'ttl',
'text/n3' :'n3','text/rdf+n3':'n3','text/rdf':'rdf',
'text/xml':'xml','application/xml':'xml'}
extension = formats[format]
filename = 'd2rq/vocab/'+prefix+'.'+extension
local_file = open(filename, "w")
local_file.write(handle.read())
local_file.close()
return extension
def get_label(subject,baseuri,store):
label = None
ns_titles = [ns.RDFS["comment"],ns.RDFS["label"],ns.DC["title"],ns.DCTERMS["title"]]
for title in ns_titles:
query = select("?o").where((subject,title,"?o"))
found_title = list(store.reader._to_table(store.reader._execute(query)))
#print 'Nombre de labels '+title+' :'+str(len(found_title))
if(len(found_title)>0):
label = literal_lang_select([found_title[x]['o'] for x in range(len(found_title))])
if(label==None): #on n'a rien trouvé du tout
label = unicode(subject).replace(baseuri,'')
return label
def get_schema_label(uri,prefix,format):
#store = surf.Store(reader='rdflib',writer='rdflib',rdflib_store='IOMemory')
store = surf.Store(**{"reader": "librdf", "writer" : "librdf", })
session = surf.Session(store)
try:
store.load_triples(source='file://'+settings.PROJECT_PATH+'/d2rq/vocab/'+prefix+'.'+format)
print "Loading from file : "+prefix+"."+format
except:
store.load_triples(source=uri)
print "Loading from Internet : "+uri
#store.enable_logging(True)
ontology = session.get_class(ns.OWL.Ontology)
if(ontology.all().first()): #contient un node Ontology
print "Le schema est une ontologie OWL"
vocab_type = 'owl'
titles = ['rdfs_comment','rdfs_label','dc_title','dcterms_title']
#import pdb; pdb.set_trace()
for o in ontology.all():
for title in titles:
if(len(o.__getattr__(title))>0):
lookup = literal_lang_select(o.__getattr__(title))
if(lookup != None):label=lookup
if not label:
label = unicode(uri)
else: # là c'est la vraie methode,
#au-dessus c'est juste pour les OWL dont l'URL ≠ de l'URI sujet
#donc pas forcément obligatoire à garder non plus
try:
print "Le schema est un vocabulaire RDFS"
vocab_type = 'rdfs'
label = get_label(rdflib.term.URIRef(uri),uri,store)
except:
raise
lookup_args = { 'owl': (ns.OWL.Class,ns.OWL.ObjectProperty),
'rdfs': (ns.RDFS.Class,ns.RDF.Property)}
vocab_classes = list(store.reader._to_table(store.reader._execute(
select("?s").where(("?s", a, lookup_args[vocab_type][0])).filter('(regex(str(?s),"'+uri+'","i"))')# vocab own classes only
)))
vocab_proprietes = list(store.reader._to_table(store.reader._execute(
select("?s").where(("?s", a, lookup_args[vocab_type][1])).filter('(regex(str(?s),"'+uri+'","i"))')
)))
cp = {'classes':[],'proprietes':[]}
for items in ((vocab_classes,'classes'),(vocab_proprietes,'proprietes')):
for triple in items[0]:
if(isinstance(triple['s'],rdflib.term.URIRef) and bool(re.compile(uri).match(unicode(triple['s'])))): #ugly patch waiting for query to work
clabel = get_label(triple['s'],uri,store) #on envoie le subject pour l'identifier
cp[items[1]].append((unicode(triple['s']),clabel))
print items[1]+':'+clabel
store.clear()
store.close()
session.close()
return((label,vocab_type,cp))
def update_class_and_properties(schema):
pass
class SchemaManager(models.Manager):
def get_by_natural_key(self, prefix, uri):
return self.get(prefix=prefix, uri=uri)
class Schema(models.Model):
objects = SchemaManager()
prefix = models.CharField(_(u'Préfixe du schéma'),max_length=10)
uri = models.CharField(_(u'URI du schéma'),max_length=200) #TODO URIField that does not cut "#" at the end would be cool
label = models.CharField(_(u'Intitulé'),max_length=200,blank=True,editable=False)
format = models.CharField(blank=True, max_length=5,editable=False)
vocab_type = models.CharField(blank=True, max_length=5,editable=False)
def natural_key(self):
return (self.prefix, self.uri)
class Meta:
ordering = ('prefix',)
unique_together =(('prefix','uri'),)
def __unicode__(self):
return unicode(self.label)
def link_in_admin(self):
return '<a target="_blank" href="%s">%s</a>' % (self.uri, self.uri)
link_in_admin.allow_tags = True
def save(self, *args, **kwargs):
print 'Ajout/mise à jour de '+str(self.uri)
if(os.path.exists(settings.PROJECT_PATH+'/d2rq/vocab/'+self.prefix+'.'+self.format)):
print 'Utilisation de la copie locale'
else:
self.format = download_schema(self.uri,self.prefix)
print 'Téléchargement du fichier'
print 'Serialisation du schema : '+self.format
#exception : pas téléchargeable
if(self.format in ['rdf','n3','ttl']):
try:
self.label, self.vocab_type,cp = get_schema_label(self.uri,self.prefix,self.format)
print 'Titre : "'+self.label+'", Type de schema : '+self.vocab_type
except:
raise
else:
self.label = self.uri
self.vocab_type = '???'
super(Schema, self).save(*args, **kwargs)
# update_class_and_properties(self)
if('cp' in locals()):
SchemaClass.objects.filter(schema=self).delete()
SchemaProperty.objects.filter(schema=self).delete()
for sc in cp['classes']:
sc = SchemaClass(schema=self,class_name=sc[0],class_label=sc[1])
sc.save()
for sp in cp['proprietes']:
sp = SchemaProperty(schema=self,prop_name=sp[0],prop_label=sp[1])
sp.save()
from utils import FkFilterSpec
FkFilterSpec.register_filterspec()
# def get_rdf_classes():
# AVAILABLE_CLASSES = []
# for s in Schema.objects.all().order_by('prefix'):
# AVAILABLE_CLASSES.append((
# s.prefix+':',
# tuple((x.id,x.class_label) for x in SchemaClass.objects.filter(schema=s))
# ))
# return AVAILABLE_CLASSES
class SchemaClass(models.Model):
schema = models.ForeignKey(Schema)
class_name = models.CharField(_(u'Classe RDF'),max_length=250,unique=True)
class_label = models.CharField(_(u'Libellé'),max_length=250)
def __unicode__(self):
return(self.class_label)
class Meta:
#unique_together = (('class_name', 'class_label'),)
ordering = ('class_label',)
verbose_name = _(u'Classe RDF')
verbose_name_plural = _(u'Classes RDF')
class SchemaProperty(models.Model):
schema = models.ForeignKey(Schema)
prop_name = models.CharField(_(u'Propriété RDF'),max_length=250,unique=True)
prop_label = models.CharField(_(u'Libellé'),max_length=250)
def __unicode__(self):
return(self.prop_label)
class Meta:
#unique_together = (('prop_name', 'prop_label'),)
ordering = ('prop_label',)
verbose_name = _(u'Propriété RDF')
verbose_name_plural = _(u'Propriétés RDF')
from smart_selects.db_fields import ChainedForeignKey
class MappedModel(models.Model):
model_name = models.ForeignKey(ContentType,verbose_name=_(u'Modéle mappé'))
schema = models.ForeignKey(Schema)
rdf_class = ChainedForeignKey(SchemaClass,
chained_field='schema',
chained_model_field='schema',
show_all=False,
verbose_name=_(u'Classe RDF'))
#rdf_class = models.ForeignKey(SchemaClass,verbose_name=_(u'Classe RDF'))
classMap_label = exfields.AutoSlugField('d2rq:classDefinitionLabel',populate_from=('rdf_class'))
class Meta:
verbose_name = _(u'Modèle mappé')
verbose_name_plural = _(u'Modèles mappés')
def __unicode__(self):
return(unicode(self.model_name.app_label)+u'.'+unicode(self.model_name)+u' ➔ '+
unicode(self.rdf_class.schema.prefix)+u':'+unicode(self.rdf_class))
class MappedField(models.Model):
model = models.ForeignKey(MappedModel,verbose_name=_(u'Mapping'))
field_name = models.CharField(max_length=250)
schema = models.ForeignKey(Schema)
rdf_property = ChainedForeignKey(SchemaProperty,
chained_field='schema',
chained_model_field='schema',
show_all=False,
verbose_name=_(u'Propriété RDF'))
#rdf_property = models.ForeignKey(SchemaProperty,verbose_name=_(u'Propriété RDF'),null=True)
# PropertyDef_label = exfields.AutoSlugField('d2rq:propertyDefinitionLabel',populate_from=('rdf_property'))
# def __unicode__(self):
# return(unicode(self.model.model_name.app_label)+u'.'+unicode(self.model_name)+u' ➔ '+
# unicode(self.rdf_class.schema.prefix)+u':'+unicode(self.rdf_class))
class Meta:
verbose_name = _(u'Champ mappé')
verbose_name_plural = _(u'Champs mappés')