def evalModify(ctx, u):
# Using replaces the dataset for evaluating the where-clause
if u.using:
otherDefault = False
for d in u.using:
if d.default:
if not otherDefault:
# replace current default graph
dg = Graph()
ctx.pushGraph(dg)
otherDefault = True
ctx.load(d.default, default=True)
elif d.named:
g = d.named
ctx.load(g, default=False)
# "The WITH clause provides a convenience for when an operation
# primarily refers to a single graph. If a graph name is specified
# in a WITH clause, then - for the purposes of evaluating the
# WHERE clause - this will define an RDF Dataset containing a
# default graph with the specified name, but only in the absence
# of USING or USING NAMED clauses. In the presence of one or more
# graphs referred to in USING clauses and/or USING NAMED clauses,
# the WITH clause will be ignored while evaluating the WHERE
# clause."
if not u.using and u.withClause:
g = ctx.dataset.get_context(u.withClause)
ctx.pushGraph(g)
res = evalPart(ctx, u.where)
if u.using:
if otherDefault:
ctx.popGraph() # restore original default graph
if u.withClause:
g = ctx.dataset.get_context(u.withClause)
ctx.pushGraph(g)
for c in res:
dg = ctx.graph
if u.delete:
dg -= _fillTemplate(u.delete.triples, c)
for g, q in u.delete.quads.iteritems():
cg = ctx.dataset.get_context(c.get(g))
cg -= _fillTemplate(q, c)
if u.insert:
dg += _fillTemplate(u.insert.triples, c)
for g, q in u.insert.quads.iteritems():
cg = ctx.dataset.get_context(c.get(g))
cg += _fillTemplate(q, c)
def evalModify(ctx, u):
# Using replaces the dataset for evaluating the where-clause
if u.using:
otherDefault = False
for d in u.using:
if d.default:
if not otherDefault:
# replace current default graph
dg = Graph()
ctx.pushGraph(dg)
otherDefault = True
ctx.load(d.default, default=True)
elif d.named:
g = d.named
ctx.load(g, default=False)
# "The WITH clause provides a convenience for when an operation
# primarily refers to a single graph. If a graph name is specified
# in a WITH clause, then - for the purposes of evaluating the
# WHERE clause - this will define an RDF Dataset containing a
# default graph with the specified name, but only in the absence
# of USING or USING NAMED clauses. In the presence of one or more
# graphs referred to in USING clauses and/or USING NAMED clauses,
# the WITH clause will be ignored while evaluating the WHERE
# clause."
if not u.using and u.withClause:
g = ctx.dataset.get_context(u.withClause)
ctx.pushGraph(g)
res = evalPart(ctx, u.where)
if u.using:
if otherDefault:
ctx.popGraph() # restore original default graph
if u.withClause:
g = ctx.dataset.get_context(u.withClause)
ctx.pushGraph(g)
for c in res:
dg = ctx.graph
if u.delete:
dg -= _fillTemplate(u.delete.triples, c)
for g, q in u.delete.quads.iteritems():
cg = ctx.dataset.get_context(g)
cg -= _fillTemplate(q, c)
if u.insert:
dg += _fillTemplate(u.insert.triples, c)
for g, q in u.insert.quads.iteritems():
cg = ctx.dataset.get_context(g)
cg += _fillTemplate(q, c)
def evalDeleteWhere(ctx, u):
"""
http://www.w3.org/TR/sparql11-update/#deleteWhere
"""
res = evalBGP(ctx, u.triples)
for g in u.quads:
cg = ctx.dataset.get_context(g)
ctx.pushGraph(cg)
res = _join(res, evalBGP(ctx, u.quads[g]))
ctx.popGraph()
for c in res:
g = ctx.graph
g -= _fillTemplate(u.triples, c)
for g in u.quads:
cg = ctx.dataset.get_context(c.get(g))
cg -= _fillTemplate(u.quads[g], c)
def evalDeleteWhere(ctx, u):
"""
http://www.w3.org/TR/sparql11-update/#deleteWhere
"""
res = evalBGP(ctx, u.triples)
for g in u.quads:
cg = ctx.dataset.get_context(g)
ctx.pushGraph(cg)
res = _join(res, evalBGP(ctx, u.quads[g]))
ctx.popGraph()
for c in res:
g = ctx.graph
g -= _fillTemplate(u.triples, c)
for g in u.quads:
cg = ctx.dataset.get_context(g)
cg -= _fillTemplate(u.quads[g], c)
def evalConstructQuery(ctx, query):
template = query.template
if not template:
# a construct-where query
template = query.p.p.triples # query->project->bgp ...
graph = Graph()
for c in evalPart(ctx, query.p):
graph += _fillTemplate(template, c)
res = {}
res["type_"] = "CONSTRUCT"
res["graph"] = graph
return res
def evalConstructQuery(ctx, query):
template = query.template
if not template:
# a construct-where query
template = query.p.p.triples # query->project->bgp ...
graph = Graph()
for c in evalPart(ctx, query.p):
graph += _fillTemplate(template, c)
res = {}
res["type_"] = "CONSTRUCT"
res["graph"] = graph
return res