author | Sylvain Thénault <sylvain.thenault@logilab.fr> |
Tue, 13 Sep 2011 15:41:11 +0200 | |
changeset 7784 | 7f5c455ec7d1 |
parent 7460 | 2455cdbeadca |
child 8695 | 358d8bed9626 |
permissions | -rw-r--r-- |
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# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved. |
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr |
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# |
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# This file is part of CubicWeb. |
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# |
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# CubicWeb is free software: you can redistribute it and/or modify it under the |
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# terms of the GNU Lesser General Public License as published by the Free |
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# Software Foundation, either version 2.1 of the License, or (at your option) |
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# any later version. |
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# |
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT |
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more |
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# details. |
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# |
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# You should have received a copy of the GNU Lesser General Public License along |
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# with CubicWeb. If not, see <http://www.gnu.org/licenses/>. |
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"""SPARQL integration""" |
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__docformat__ = "restructuredtext en" |
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_ = unicode |
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from yams import xy |
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from rql import TypeResolverException |
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from lxml import etree |
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from lxml.builder import E |
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from cubicweb.view import StartupView, AnyRsetView |
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from cubicweb.web import Redirect, form, formfields, formwidgets as fwdgs |
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from cubicweb.web.views import forms |
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try: |
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from cubicweb.spa2rql import Sparql2rqlTranslator, UnsupportedQuery |
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except ImportError: |
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# fyzz not available (only a recommends) |
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Sparql2rqlTranslator = None |
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class SparqlForm(forms.FieldsForm): |
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__regid__ = 'sparql' |
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sparql = formfields.StringField(help=_('type here a sparql query')) |
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resultvid = formfields.StringField(choices=((_('table'), 'table'), |
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(_('sparql xml'), 'sparqlxml')), |
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widget=fwdgs.Radio, |
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value='table') |
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form_buttons = [fwdgs.SubmitButton()] |
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@property |
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def action(self): |
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return self._cw.url() |
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class SparqlFormView(form.FormViewMixIn, StartupView): |
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__regid__ = 'sparql' |
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def call(self): |
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form = self._cw.vreg['forms'].select('sparql', self._cw) |
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form.render(w=self.w) |
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sparql = self._cw.form.get('sparql') |
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vid = self._cw.form.get('resultvid', 'table') |
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if sparql: |
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try: |
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qinfo = Sparql2rqlTranslator(self._cw.vreg.schema).translate(sparql) |
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except TypeResolverException, exc: |
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self.w(self._cw._('can not resolve entity types:') + u' ' + unicode(exc)) |
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except UnsupportedQuery: |
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self.w(self._cw._('we are not yet ready to handle this query')) |
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except xy.UnsupportedVocabulary, exc: |
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self.w(self._cw._('unknown vocabulary:') + u' ' + unicode(exc)) |
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else: |
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rql, args = qinfo.finalize() |
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if vid == 'sparqlxml': |
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url = self._cw.build_url('view', rql=rql % args, vid=vid) |
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raise Redirect(url) |
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rset = self._cw.execute(rql, args) |
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self.wview(vid, rset, 'null') |
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## sparql resultset views ##################################################### |
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YAMS_XMLSCHEMA_MAPPING = { |
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'String': 'string', |
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'Boolean': 'boolean', |
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'Int': 'integer', |
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'BigInt': 'integer', |
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'Float': 'float', |
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'Datetime': 'dateTime', |
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'TZDatetime': 'dateTime', |
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'Date': 'date', |
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'Time': 'time', |
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'TZTime': 'time', |
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# XXX the following types don't have direct mapping |
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'Decimal': 'string', |
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'Interval': 'duration', |
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'Bytes': 'base64Binary', |
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'Password': 'string', |
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} |
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def xmlschema(yamstype): |
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return 'http://www.w3.org/2001/XMLSchema#%s' % YAMS_XMLSCHEMA_MAPPING[yamstype] |
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class SparqlResultXmlView(AnyRsetView): |
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"""The spec can be found here: http://www.w3.org/TR/rdf-sparql-XMLres/ |
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""" |
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__regid__ = 'sparqlxml' |
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content_type = 'application/sparql-results+xml' |
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templatable = False |
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|
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def call(self): |
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# XXX handle UNION |
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rqlst = self.cw_rset.syntax_tree().children[0] |
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varnames = [var.name for var in rqlst.selection] |
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results = E.results() |
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for rowidx in xrange(len(self.cw_rset)): |
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result = E.result() |
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for colidx, varname in enumerate(varnames): |
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result.append(self.cell_binding(rowidx, colidx, varname)) |
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results.append(result) |
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sparql = E.sparql(E.head(*(E.variable(name=name) for name in varnames)), |
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results) |
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self.w(u'<?xml version="1.0"?>\n') |
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self.w(etree.tostring(sparql, encoding=unicode, pretty_print=True)) |
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|
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def cell_binding(self, row, col, varname): |
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celltype = self.cw_rset.description[row][col] |
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if self._cw.vreg.schema.eschema(celltype).final: |
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cellcontent = self._cw.view('cell', self.cw_rset, row=row, col=col) |
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return E.binding(E.literal(cellcontent, |
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datatype=xmlschema(celltype)), |
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name=varname) |
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else: |
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entity = self.cw_rset.get_entity(row, col) |
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return E.binding(E.uri(entity.absolute_url()), name=varname) |
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def set_request_content_type(self): |
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"""overriden to set the correct filetype and filename""" |
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self._cw.set_content_type(self.content_type, |
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filename='sparql.xml', |
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encoding=self._cw.encoding) |
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def registration_callback(vreg): |
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if Sparql2rqlTranslator is not None: |
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vreg.register_all(globals().values(), __name__) |