def read_translate(self, query, bindings_set=[{}], reqd_bound_vars=[]):
query_triples = self.parser.parse(query)
ret_evals = []
bindings_set = explode_bindings_set(bindings_set)
if len(reqd_bound_vars) == 0:
reqd_bound_vars = find_vars(query_triples, is_lit_var)
if len(reqd_bound_vars) == 0:
p('Warning: no required bound variables. Are there any _vars?'
)
#for triples in sub_var_bindings_set(query_triples, bindings_set) :
for bindings in bindings_set:
#p('bindings',bindings)
#p('reqd_bound_vars',reqd_bound_vars)
new_reqd_bound_vars = []
provided_bindings = []
for var in reqd_bound_vars:
if var in bindings:
provided_bindings.append(var)
else:
new_reqd_bound_vars.append(var)
reqd_bound_vars = new_reqd_bound_vars
#p('reqd_bound_vars',reqd_bound_vars)
#p('provided_bindings',provided_bindings)
triples = sub_var_bindings(query_triples, bindings)
begin_compile = time.time()
ret_comp = self.compiler.compile(triples, reqd_bound_vars)
end_compile = time.time()
#p('ret_comp',ret_comp)
if 'time' in self.options:
print 'compile time:', end_compile - begin_compile
self.cum_comp_time += end_compile - begin_compile
if ret_comp == False:
raise CompilerException(
"Couldn't compile ... sorry I don't have more here")
begin_eval = time.time()
#for i in range(100) :
ret_eval = self.evaluator.evaluate(ret_comp)
end_eval = time.time()
if 'time' in self.options:
print 'eval time:', end_eval - begin_eval
self.cum_eval_time += end_eval - begin_eval
for ret in ret_eval:
for var in provided_bindings:
ret[var] = bindings[var]
#p('ret_eval',ret_eval)
ret_evals.extend(ret_eval)
return ret_evals
def read_translate(self, query, bindings_set = [{}], reqd_bound_vars = []) :
query_triples = self.parser.parse(query)
ret_evals = []
bindings_set = explode_bindings_set(bindings_set)
if len(reqd_bound_vars) == 0 :
reqd_bound_vars = find_vars(query_triples, is_lit_var)
if len(reqd_bound_vars) == 0 :
p('Warning: no required bound variables. Are there any _vars?')
#for triples in sub_var_bindings_set(query_triples, bindings_set) :
for bindings in bindings_set :
#p('bindings',bindings)
#p('reqd_bound_vars',reqd_bound_vars)
new_reqd_bound_vars = []
provided_bindings = []
for var in reqd_bound_vars :
if var in bindings :
provided_bindings.append(var)
else :
new_reqd_bound_vars.append(var)
reqd_bound_vars = new_reqd_bound_vars
#p('reqd_bound_vars',reqd_bound_vars)
#p('provided_bindings',provided_bindings)
triples = sub_var_bindings(query_triples, bindings)
begin_compile = time.time()
ret_comp = self.compiler.compile(triples, reqd_bound_vars)
end_compile = time.time()
#p('ret_comp',ret_comp)
if 'time' in self.options :
print 'compile time:',end_compile-begin_compile
self.cum_comp_time += end_compile-begin_compile
if ret_comp == False :
raise CompilerException("Couldn't compile ... sorry I don't have more here")
begin_eval = time.time()
#for i in range(100) :
ret_eval = self.evaluator.evaluate(ret_comp)
end_eval = time.time()
if 'time' in self.options :
print 'eval time:',end_eval-begin_eval
self.cum_eval_time += end_eval-begin_eval
for ret in ret_eval :
for var in provided_bindings :
ret[var] = bindings[var]
#p('ret_eval',ret_eval)
ret_evals.extend(ret_eval)
return ret_evals
def write_sparql(self, query, bindings_set = [{}]) :
"""
write triples into sparql database.
NOTE: any URI which is_var will be converted to a fresh bnode URI
"""
if not self.sparql :
raise Exception("sparql not initialized")
query_triples = self.parser.parse(query)
bindings_set = explode_bindings_set(bindings_set)
for bindings in bindings_set :
triples = sub_var_bindings(query_triples, bindings)
missing_vars = find_vars(triples)
if len(missing_vars) is not 0 :
new_bindings = dict([(var, self.urigen()) for var in missing_vars])
triples = sub_var_bindings(triples, new_bindings)
bindings.update(new_bindings)
self.sparql.write(triples)
return bindings_set
def write_sparql(self, query, bindings_set=[{}]):
"""
write triples into sparql database.
NOTE: any URI which is_var will be converted to a fresh bnode URI
"""
if not self.sparql:
raise Exception("sparql not initialized")
query_triples = self.parser.parse(query)
bindings_set = explode_bindings_set(bindings_set)
for bindings in bindings_set:
triples = sub_var_bindings(query_triples, bindings)
missing_vars = find_vars(triples)
if len(missing_vars) is not 0:
new_bindings = dict([(var, self.urigen())
for var in missing_vars])
triples = sub_var_bindings(triples, new_bindings)
bindings.update(new_bindings)
self.sparql.write(triples)
return bindings_set
def new_read(self, query, expected_vars = [], varnamespace = None, outvarnamespace = None) :
#print('query',query)
# TODO: extract out the result bindings as in self.read
# TODO: allow object notation as root query.
# TODO: depricate read, and others
# TODO: more cleaning
# TODO: figure out some way to avoid having resets everywhere. Should this
# be some other class to do each translation?
if varnamespace == None :
varnamespace = self.n.var
# for now, these need to come in the triples set in the same order as
# required by SPARQL. LIMIT after ORDER and OFFSET after LIMIT
modifiers = []
new_query = []
count = False
for triple in query :
modified = False
if triple[0] == self.n.query.query :
if triple[1] == self.n.query.limit :
modifiers.append('LIMIT %d' % int(triple[2]))
modified = True
if triple[1] == self.n.query.offset :
modifiers.append('OFFSET %d' % int(triple[2]))
modified = True
if triple[1] == self.n.query.sort_ascending :
modifiers.append('ORDER BY ?%s' % var_name(triple[2]))
modified = True
if triple[1] == self.n.query.sort_descending :
modifiers.append('ORDER BY DESC(?%s)' % var_name(triple[2]))
modified = True
if triple[1] == self.n.query['count'] :
count = triple[2]
if not is_any_var(count) :
raise Exception('When query.query[query.count] = count. count must be a variable')
count = var_name(count)
modified = True
if not modified :
new_query.append(triple)
query = new_query
# determine what the output vars are before they are sanitized for
# triplelist_to_sparql
if count :
output_vars_list = 'COUNT(*)'
else :
output_vars_list = '*'
if outvarnamespace :
output_vars = find_vars(query, lambda var: var.find(outvarnamespace) == 0)
if len(output_vars) :
output_vars_list = ' '.join(map(lambda x:'?'+x, output_vars))
self.sanitize_vars(query, outvarnamespace, varnamespace)
else :
print("couldn't find them")
#print('output_vars_list',output_vars_list)
self.reset_py_to_SPARQL_bnode()
self._reset_SPARQL_variables()
query_str = self.triplelist_to_sparql(query, varnamespace)
#print('query',query)
query = "SELECT %s WHERE { %s } %s" % (output_vars_list, self.wrapGraph(query_str), '\n'.join(modifiers))
ret = self.doQuery(query)
if count :
# NOTE: This is most likely implementation dependant. Works for Joseki-3.3.0
yield {count : int(ret['results']['bindings'][0][u'.1']['value'])}
else :
for binding in ret['results']['bindings'] :
newbinding = {}
for var, value in binding.iteritems() :
if value['type'] == 'typed-literal' :
if value['datatype'] == 'http://www.w3.org/2001/XMLSchema#integer' :
newbinding[var] = int(value['value'])
elif value['datatype'] == 'http://www.w3.org/2001/XMLSchema#decimal' :
newbinding[var] = float(value['value'])
elif value['type'] == 'literal' :
newbinding[var] = value['value']
elif value['type'] == 'uri' :
newbinding[var] = URIRef(value['value'])
elif value['type'] == 'bnode' :
raise Exception('cant do bnodes')
yield newbinding
def bound_vars_general(self, g): triples = self.parser.parse(g.group(1), reset_bnodes = False) return find_vars(triples), triples
