class Controller:
def __init__(self):
self.current = None #URIRef
self.history = History()
def set_model(self, model):
self.model = model
def load(self, source):
"""Load triples in graph from source."""
return self.model.load(source)
def size(self):
"""Return number of triples in graph."""
return self.model.size()
def ls(self, uri):
"""Return objects of current if predicate given, return current predicates-objects if no uri is given."""
if uri:
ref = self.model.to_uriref(uri)
if ref and self.current:
return self.model.get_objects(self.current, ref)
elif self.current:
return self.model.get_properties(self.current)
return None
def is_(self, uri):
"""Return subjects of current if predicate given, return current subjects-predicates if no uri is given."""
if uri:
ref = self.model.to_uriref(uri)
if ref and self.current:
return self.model.get_subjects(ref, self.current)
elif self.current:
return self.model.get_reverse_properties(self.current)
return None
def go(self, uri):
"""Set current to given resource uri, or to None if no uri is given."""
if uri:
ref = self.model.to_uriref(uri)
self.model.load(str(ref))
if self.model.contains_resource(ref):
self.current = ref
self.history.push(ref)
return ref
return False
else:
self.current = None
self.history.push(None)
return None
def get_objects(self, uri):
if uri:
ref = self.model.to_uriref(uri)
if ref and self.current:
return self.model.get_resource_objects(self.current, ref)
return False
else:
return False
def fw(self, uri, index=0):
"""Set current to object of given predicate of current."""
if uri:
ref = self.model.to_uriref(uri)
if ref and self.current:
objs = self.model.get_resource_objects(self.current, ref)
if len(objs) > 0:
obj = objs[index]
self.model.load(str(obj))
self.current = obj
self.history.push(obj)
return obj
return False
else:
return False
def get_subjects(self, uri):
if uri:
ref = self.model.to_uriref(uri)
if ref and self.current:
return self.model.get_subjects(ref, self.current)
return False
else:
return False
def bw(self, uri, index=0):
"""Set current to subject of given predicate pointing to current."""
if uri:
ref = self.model.to_uriref(uri)
if ref and self.current:
subjs = self.model.get_subjects(ref, self.current)
if len(subjs) > 0:
subj = subjs[index]
self.model.load(str(subj))
self.current = subj
self.history.push(subj)
return subj
return False
else:
return False
def forward(self):
ref = self.history.forward()
if ref != False:
self.current = ref
return ref
def back(self):
ref = self.history.back()
if ref != False:
self.current = ref
return ref
def this(self):
"""Return current."""
return self.current
def pred(self):
"""Return predicates of current."""
return self.model.pred(self.current)
def types(self):
"""Return all terms that exist as objects of rdf:type."""
return self.model.types()
def norm(self, ref):
return self.model.norm(ref)
