Commit bf2f6b26 authored by Nicolas Chauvat's avatar Nicolas Chauvat
Browse files

[web/views] add a generic rdf view

parent e1605db1a933
# pylint: disable=W0622,C0103
# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# pylint: disable=W0622,C0103
# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
......@@ -62,6 +62,7 @@ __recommends__ = {
'pycrypto': '', # for crypto extensions
'fyzz': '>= 0.1.0', # for sparql
'vobject': '>= 0.6.0', # for ical view
'rdflib': None, #
#'Products.FCKeditor':'',
#'SimpleTAL':'>= 4.1.6',
}
......
......@@ -83,7 +83,7 @@ Package: cubicweb-web
Architecture: all
XB-Python-Version: ${python:Versions}
Depends: ${misc:Depends}, ${python:Depends}, cubicweb-common (= ${source:Version}), python-simplejson (>= 1.3)
Recommends: python-docutils, python-vobject, fckeditor, python-fyzz, python-imaging
Recommends: python-docutils, python-vobject, fckeditor, python-fyzz, python-imaging, python-rdflib
Description: web interface library for the CubicWeb framework
CubicWeb is a semantic web application framework.
.
......
# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
"""base xml and rss views"""
__docformat__ = "restructuredtext en"
_ = unicode
from yams import xy
from cubicweb.schema import VIRTUAL_RTYPES
from cubicweb.view import EntityView
from cubicweb.web.views.xmlrss import SERIALIZERS
try:
import rdflib
except ImportError:
rdflib = None
if rdflib is not None:
RDF = rdflib.Namespace('http://www.w3.org/1999/02/22-rdf-syntax-ns#')
CW = rdflib.Namespace('http://ns.cubicweb.org/cubicweb/0.0/')
from rdflib import Literal, URIRef, Namespace
def urijoin(item):
base, ext = item
return URIRef(Namespace(base)[ext])
SKIP_RTYPES = VIRTUAL_RTYPES | set(['cwuri', 'is', 'is_instance_of'])
class RDFView(EntityView):
"""rdf view for entities"""
__regid__ = 'rdf'
title = _('rdf')
templatable = False
content_type = 'text/xml' # +rdf
def call(self):
graph = rdflib.Graph()
graph.bind('cw', CW)
for prefix, xmlns in xy.XY.prefixes.items():
graph.bind(prefix, rdflib.Namespace(xmlns))
for i in xrange(self.cw_rset.rowcount):
entity = self.cw_rset.complete_entity(i, 0)
self.entity2graph(graph, entity)
self.w(graph.serialize().decode('utf-8'))
def entity2graph(self, graph, entity):
cwuri = URIRef(entity.cwuri)
add = graph.add
add( (cwuri, RDF.type, CW[entity.e_schema.type]) )
try:
for item in xy.xeq(entity.e_schema.type):
add( (cwuri, RDF.type, urijoin(item)) )
except xy.UnsupportedVocabulary:
pass
for rschema, eschemas, role in entity.e_schema.relation_definitions('relation'):
rtype = rschema.type
if rtype in SKIP_RTYPES or rtype.endswith('_permission'):
continue
for eschema in eschemas:
if eschema.final:
try:
value = entity.cw_attr_cache[rtype]
except KeyError:
continue # assuming rtype is Bytes
if value is not None:
add( (cwuri, CW[rtype], Literal(value)) )
try:
for item in xy.xeq('%s %s' % (entity.e_schema.type, rtype)):
add( (cwuri, urijoin(item[1]), Literal(value)) )
except xy.UnsupportedVocabulary:
pass
else:
for related in entity.related(rtype, role, entities=True):
if role == 'subject':
add( (cwuri, CW[rtype], URIRef(related.cwuri)) )
try:
for item in xy.xeq('%s %s' % (entity.e_schema.type, rtype)):
add( (cwuri, urijoin(item), URIRef(related.cwuri)) )
except xy.UnsupportedVocabulary:
pass
else:
add( (URIRef(related.cwuri), CW[rtype], cwuri) )
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