cubicweb/web/views/rdf.py
changeset 11057 0b59724cb3f2
parent 10666 7f6b5f023884
child 11767 432f87a63057
equal deleted inserted replaced
11052:058bb3dc685f 11057:0b59724cb3f2
       
     1 # copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
       
     2 # contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
       
     3 #
       
     4 # This file is part of CubicWeb.
       
     5 #
       
     6 # CubicWeb is free software: you can redistribute it and/or modify it under the
       
     7 # terms of the GNU Lesser General Public License as published by the Free
       
     8 # Software Foundation, either version 2.1 of the License, or (at your option)
       
     9 # any later version.
       
    10 #
       
    11 # CubicWeb is distributed in the hope that it will be useful, but WITHOUT
       
    12 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
       
    13 # FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
       
    14 # details.
       
    15 #
       
    16 # You should have received a copy of the GNU Lesser General Public License along
       
    17 # with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
       
    18 """base xml and rss views"""
       
    19 
       
    20 __docformat__ = "restructuredtext en"
       
    21 from cubicweb import _
       
    22 
       
    23 from six.moves import range
       
    24 
       
    25 from yams import xy
       
    26 
       
    27 from cubicweb.schema import VIRTUAL_RTYPES
       
    28 from cubicweb.view import EntityView
       
    29 from cubicweb.web.views.xmlrss import SERIALIZERS
       
    30 
       
    31 try:
       
    32     import rdflib
       
    33 except ImportError:
       
    34     rdflib = None
       
    35 
       
    36 if rdflib is not None:
       
    37     RDF = rdflib.Namespace('http://www.w3.org/1999/02/22-rdf-syntax-ns#')
       
    38     CW = rdflib.Namespace('http://ns.cubicweb.org/cubicweb/0.0/')
       
    39     from rdflib import Literal, URIRef, Namespace
       
    40 
       
    41     def urijoin(item):
       
    42         base, ext = item
       
    43         return URIRef(Namespace(base)[ext])
       
    44 
       
    45     SKIP_RTYPES = VIRTUAL_RTYPES | set(['cwuri', 'is', 'is_instance_of'])
       
    46 
       
    47     class RDFView(EntityView):
       
    48         """rdf view for entities"""
       
    49         __regid__ = 'rdf'
       
    50         title = _('rdf export')
       
    51         templatable = False
       
    52         binary = True
       
    53         format = 'xml'
       
    54         content_type = 'text/xml' # +rdf
       
    55 
       
    56         def call(self):
       
    57             graph = rdflib.Graph()
       
    58             graph.bind('cw', CW)
       
    59             for prefix, xmlns in xy.XY.prefixes.items():
       
    60                 graph.bind(prefix, rdflib.Namespace(xmlns))
       
    61             for i in range(self.cw_rset.rowcount):
       
    62                 entity = self.cw_rset.complete_entity(i, 0)
       
    63                 self.entity2graph(graph, entity)
       
    64             self.w(graph.serialize(format=self.format))
       
    65 
       
    66         def entity_call(self, entity):
       
    67             self.call()
       
    68 
       
    69         def entity2graph(self, graph, entity):
       
    70             cwuri = URIRef(entity.cwuri)
       
    71             add = graph.add
       
    72             add( (cwuri, RDF.type, CW[entity.e_schema.type]) )
       
    73             try:
       
    74                 for item in xy.xeq(entity.e_schema.type):
       
    75                     add( (cwuri, RDF.type, urijoin(item)) )
       
    76             except xy.UnsupportedVocabulary:
       
    77                 pass
       
    78             for rschema, eschemas, role in entity.e_schema.relation_definitions('relation'):
       
    79                 rtype = rschema.type
       
    80                 if rtype in SKIP_RTYPES or rtype.endswith('_permission'):
       
    81                     continue
       
    82                 for eschema in eschemas:
       
    83                     if eschema.final:
       
    84                         try:
       
    85                             value = entity.cw_attr_cache[rtype]
       
    86                         except KeyError:
       
    87                             continue # assuming rtype is Bytes
       
    88                         if value is not None:
       
    89                             add( (cwuri, CW[rtype], Literal(value)) )
       
    90                             try:
       
    91                                 for item in xy.xeq('%s %s' % (entity.e_schema.type, rtype)):
       
    92                                     add( (cwuri, urijoin(item[1]), Literal(value)) )
       
    93                             except xy.UnsupportedVocabulary:
       
    94                                 pass
       
    95                     else:
       
    96                         for related in entity.related(rtype, role, entities=True, safe=True):
       
    97                             if role == 'subject':
       
    98                                 add( (cwuri, CW[rtype], URIRef(related.cwuri)) )
       
    99                                 try:
       
   100                                     for item in xy.xeq('%s %s' % (entity.e_schema.type, rtype)):
       
   101                                         add( (cwuri, urijoin(item[1]), URIRef(related.cwuri)) )
       
   102                                 except xy.UnsupportedVocabulary:
       
   103                                     pass
       
   104                             else:
       
   105                                 add( (URIRef(related.cwuri), CW[rtype], cwuri) )
       
   106 
       
   107 
       
   108     class RDFN3View(RDFView):
       
   109         __regid__ = 'n3rdf'
       
   110         format = 'n3'
       
   111         content_type = 'text/n3'