class Context(GraphOperations):
def __init__(self, parent, identifier=None, meta=None):
self.parent = parent
if identifier is None:
identifier = BNode()
self.identifier = URIRef(identifier)
self.meta = MetaData(self, meta)
self.meta.generate()
@property
def graph(self):
if not hasattr(self, '_graph') or self._graph is None:
if self.parent.buffered:
self._graph = Graph(identifier=self.identifier)
else:
self._graph = self.parent.graph.get_context(self.identifier)
return self._graph
def add(self, schema, data):
""" Stage ``data`` as a set of statements, based on the given
``schema`` definition. """
binding = self.get_binding(schema, data)
uri, triples = triplify(binding)
for triple in triples:
self.graph.add(triple)
return uri
def save(self):
""" Transfer the statements in this context over to the main store. """
if self.parent.buffered:
query = """
INSERT DATA { GRAPH %s { %s } }
"""
query = query % (self.identifier.n3(),
self.graph.serialize(format='nt'))
self.parent.graph.update(query)
self.flush()
else:
self.meta.generate()
def delete(self):
""" Delete all statements matching the current context identifier
from the main store. """
if self.parent.buffered:
query = 'CLEAR SILENT GRAPH %s ;' % self.identifier.n3()
self.parent.graph.update(query)
self.flush()
else:
self.graph.remove((None, None, None))
def flush(self):
""" Clear all the pending statements in the local context, without
transferring them to the main store. """
self._graph = None
def __str__(self):
return self.identifier
def __repr__(self):
return '<Context("%s")>' % self.identifier
def __init__(self, parent, identifier=None, meta=None):
self.parent = parent
if identifier is None:
identifier = BNode()
self.identifier = URIRef(identifier)
self.meta = MetaData(self, meta)
self.meta.generate()
def __init__(self, parent, identifier=None, meta=None):
self.parent = parent
if identifier is None:
identifier = BNode()
self.identifier = URIRef(identifier)
self.meta = MetaData(self, meta)
self.meta.generate()
class Context(GraphOperations):
def __init__(self, parent, identifier=None, meta=None):
self.parent = parent
if identifier is None:
identifier = BNode()
self.identifier = URIRef(identifier)
self.meta = MetaData(self, meta)
self.meta.generate()
@property
def graph(self):
if not hasattr(self, '_graph') or self._graph is None:
if self.parent.buffered:
self._graph = Graph(identifier=self.identifier)
else:
self._graph = self.parent.graph.get_context(self.identifier)
return self._graph
def add(self, schema, data):
""" Stage ``data`` as a set of statements, based on the given
``schema`` definition. """
binding = self.get_binding(schema, data)
uri, triples = triplify(binding)
for triple in triples:
self.graph.add(triple)
return uri
def save(self):
""" Transfer the statements in this context over to the main store. """
if self.parent.buffered:
query = """
INSERT DATA { GRAPH %s { %s } }
"""
query = query % (self.identifier.n3(),
self.graph.serialize(format='nt'))
self.parent.graph.update(query)
self.flush()
else:
self.meta.generate()
def delete(self):
""" Delete all statements matching the current context identifier
from the main store. """
if self.parent.buffered:
query = 'CLEAR SILENT GRAPH %s ;' % self.identifier.n3()
self.parent.graph.update(query)
self.flush()
else:
self.graph.remove((None, None, None))
def flush(self):
""" Clear all the pending statements in the local context, without
transferring them to the main store. """
self._graph = None
def __str__(self):
return self.identifier
def __repr__(self):
return '<Context("%s")>' % self.identifier
