author | Sylvain Thénault <sylvain.thenault@logilab.fr> |
Fri, 09 Oct 2009 15:10:17 +0200 | |
branch | stable |
changeset 3625 | f03b55a18c43 |
parent 2529 | 736893a990c4 |
child 2789 | 39712da6f397 |
child 3689 | deb13e88e037 |
permissions | -rw-r--r-- |
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"""SPARQL integration |
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|
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:organization: Logilab |
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:copyright: 2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2. |
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr |
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses |
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""" |
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v__docformat__ = "restructuredtext en" |
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import rql |
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from yams import xy |
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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, urlrewrite |
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try: |
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from cubicweb.spa2rql import Sparql2rqlTranslator |
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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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id = '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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initial='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.req.url() |
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|
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class SparqlFormView(form.FormViewMixIn, StartupView): |
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id = 'sparql' |
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def call(self): |
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form = self.vreg.select('forms', 'sparql', self.req) |
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self.w(form.form_render()) |
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sparql = self.req.form.get('sparql') |
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vid = self.req.form.get('resultvid', 'table') |
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if sparql: |
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try: |
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qinfo = Sparql2rqlTranslator(self.schema).translate(sparql) |
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except rql.TypeResolverException, ex: |
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self.w(self.req._('can not resolve entity types:') + u' ' + unicode('ex')) |
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except UnsupportedQuery: |
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self.w(self.req._('we are not yet ready to handle this query')) |
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except xy.UnsupportedVocabulary, ex: |
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self.w(self.req._('unknown vocabulary:') + u' ' + unicode('ex')) |
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if vid == 'sparqlxml': |
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url = self.build_url('view', rql=qinfo.finalize(), vid=vid) |
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raise Redirect(url) |
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rset = self.req.execute(qinfo.finalize()) |
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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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'Int': 'integer', |
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'Float': 'float', |
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'Boolean': 'boolean', |
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'Datetime': 'dateTime', |
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'Date': 'date', |
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'Time': '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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'Password': 'string', |
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'Bytes': 'base64Binary', |
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} |
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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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id = 'sparqlxml' |
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content_type = 'application/sparql-results+xml' |
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templatable = False |
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def call(self): |
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# XXX handle UNION |
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rqlst = self.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.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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101 |
self.w(etree.tostring(sparql, encoding=unicode, pretty_print=True)) |
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102 |
|
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103 |
def cell_binding(self, row, col, varname): |
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104 |
celltype = self.rset.description[row][col] |
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105 |
if self.schema.eschema(celltype).is_final(): |
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106 |
cellcontent = self.view('cell', self.rset, row=row, col=col) |
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107 |
return E.binding(E.literal(cellcontent, |
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108 |
datatype=xmlschema(celltype)), |
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109 |
name=varname) |
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110 |
else: |
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111 |
entity = self.entity(row, col) |
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return E.binding(E.uri(entity.absolute_url()), name=varname) |
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113 |
|
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114 |
def set_request_content_type(self): |
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115 |
"""overriden to set the correct filetype and filename""" |
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self.req.set_content_type(self.content_type, |
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filename='sparql.xml', |
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118 |
encoding=self.req.encoding) |
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119 |
|
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120 |
def registration_callback(vreg): |
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121 |
if Sparql2rqlTranslator is not None: |
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122 |
vreg.register_all(globals().values(), __name__) |