[session/transaction] removed unused transaction class
Related to #3933480.
# 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/>.
"""SPARQL integration"""
__docformat__ = "restructuredtext en"
_ = unicode
from yams import xy
from rql import TypeResolverException
from lxml import etree
from lxml.builder import E
from cubicweb.view import StartupView, AnyRsetView
from cubicweb.web import Redirect, form, formfields, formwidgets as fwdgs
from cubicweb.web.views import forms
try:
from cubicweb.spa2rql import Sparql2rqlTranslator, UnsupportedQuery
except ImportError:
# fyzz not available (only a recommends)
Sparql2rqlTranslator = None
class SparqlForm(forms.FieldsForm):
__regid__ = 'sparql'
sparql = formfields.StringField(help=_('type here a sparql query'))
resultvid = formfields.StringField(choices=((_('table'), 'table'),
(_('sparql xml'), 'sparqlxml')),
widget=fwdgs.Radio,
value='table')
form_buttons = [fwdgs.SubmitButton()]
@property
def action(self):
return self._cw.url()
class SparqlFormView(form.FormViewMixIn, StartupView):
__regid__ = 'sparql'
def call(self):
form = self._cw.vreg['forms'].select('sparql', self._cw)
form.render(w=self.w)
sparql = self._cw.form.get('sparql')
vid = self._cw.form.get('resultvid', 'table')
if sparql:
try:
qinfo = Sparql2rqlTranslator(self._cw.vreg.schema).translate(sparql)
except TypeResolverException as exc:
self.w(self._cw._('can not resolve entity types:') + u' ' + unicode(exc))
except UnsupportedQuery:
self.w(self._cw._('we are not yet ready to handle this query'))
except xy.UnsupportedVocabulary as exc:
self.w(self._cw._('unknown vocabulary:') + u' ' + unicode(exc))
else:
rql, args = qinfo.finalize()
if vid == 'sparqlxml':
url = self._cw.build_url('view', rql=rql % args, vid=vid)
raise Redirect(url)
rset = self._cw.execute(rql, args)
self.wview(vid, rset, 'null')
## sparql resultset views #####################################################
YAMS_XMLSCHEMA_MAPPING = {
'String': 'string',
'Boolean': 'boolean',
'Int': 'integer',
'BigInt': 'integer',
'Float': 'float',
'Datetime': 'dateTime',
'TZDatetime': 'dateTime',
'Date': 'date',
'Time': 'time',
'TZTime': 'time',
# XXX the following types don't have direct mapping
'Decimal': 'string',
'Interval': 'duration',
'Bytes': 'base64Binary',
'Password': 'string',
}
def xmlschema(yamstype):
return 'http://www.w3.org/2001/XMLSchema#%s' % YAMS_XMLSCHEMA_MAPPING[yamstype]
class SparqlResultXmlView(AnyRsetView):
"""The spec can be found here: http://www.w3.org/TR/rdf-sparql-XMLres/
"""
__regid__ = 'sparqlxml'
content_type = 'application/sparql-results+xml'
templatable = False
def call(self):
# XXX handle UNION
rqlst = self.cw_rset.syntax_tree().children[0]
varnames = [var.name for var in rqlst.selection]
results = E.results()
for rowidx in xrange(len(self.cw_rset)):
result = E.result()
for colidx, varname in enumerate(varnames):
result.append(self.cell_binding(rowidx, colidx, varname))
results.append(result)
sparql = E.sparql(E.head(*(E.variable(name=name) for name in varnames)),
results)
self.w(u'<?xml version="1.0"?>\n')
self.w(etree.tostring(sparql, encoding=unicode, pretty_print=True))
def cell_binding(self, row, col, varname):
celltype = self.cw_rset.description[row][col]
if self._cw.vreg.schema.eschema(celltype).final:
cellcontent = self._cw.view('cell', self.cw_rset, row=row, col=col)
return E.binding(E.literal(cellcontent,
datatype=xmlschema(celltype)),
name=varname)
else:
entity = self.cw_rset.get_entity(row, col)
return E.binding(E.uri(entity.absolute_url()), name=varname)
def set_request_content_type(self):
"""overriden to set the correct filetype and filename"""
self._cw.set_content_type(self.content_type,
filename='sparql.xml',
encoding=self._cw.encoding)
def registration_callback(vreg):
if Sparql2rqlTranslator is not None:
vreg.register_all(globals().itervalues(), __name__)