// TriplesForObject returns all triples available for a given object.
func (m *memory) TriplesForObject(o *triple.Object, lo *storage.LookupOptions) (storage.Triples, error) {
oGUID := o.GUID()
m.rwmu.RLock()
triples := make(chan *triple.Triple, len(m.idxO[oGUID]))
go func() {
ckr := newChecker(lo)
for _, t := range m.idxO[oGUID] {
if ckr.CheckAndUpdate(t.P()) {
triples <- t
}
}
m.rwmu.RUnlock()
close(triples)
}()
return triples, nil
}
// PredicatesForObject returns all the predicates known for the given object.
func (m *memory) PredicatesForObject(o *triple.Object, lo *storage.LookupOptions) (storage.Predicates, error) {
oGUID := o.GUID()
m.rwmu.RLock()
preds := make(chan *predicate.Predicate, len(m.idxO[oGUID]))
go func() {
ckr := newChecker(lo)
for _, t := range m.idxO[oGUID] {
if ckr.CheckAndUpdate(t.Predicate()) {
preds <- t.Predicate()
}
}
m.rwmu.RUnlock()
close(preds)
}()
return preds, nil
}
// TriplesForPredicateAndObject returns all triples available for the given
// predicate and object.
func (m *memory) TriplesForPredicateAndObject(p *predicate.Predicate, o *triple.Object, lo *storage.LookupOptions) (storage.Triples, error) {
pGUID := p.GUID()
oGUID := o.GUID()
poIdx := strings.Join([]string{pGUID, oGUID}, ":")
m.rwmu.RLock()
triples := make(chan *triple.Triple, len(m.idxPO[poIdx]))
go func() {
ckr := newChecker(lo)
for _, t := range m.idxPO[poIdx] {
if ckr.CheckAndUpdate(t.P()) {
triples <- t
}
}
m.rwmu.RUnlock()
close(triples)
}()
return triples, nil
}
// PredicatesForSubjecAndObject returns all predicates available for the
// given subject and object.
func (m *memory) PredicatesForSubjectAndObject(s *node.Node, o *triple.Object, lo *storage.LookupOptions) (storage.Predicates, error) {
sGUID := s.GUID()
oGUID := o.GUID()
soIdx := strings.Join([]string{sGUID, oGUID}, ":")
m.rwmu.RLock()
preds := make(chan *predicate.Predicate, len(m.idxSO[soIdx]))
go func() {
ckr := newChecker(lo)
for _, t := range m.idxSO[soIdx] {
if ckr.CheckAndUpdate(t.P()) {
preds <- t.P()
}
}
m.rwmu.RUnlock()
close(preds)
}()
return preds, nil
}
// Subject returns the subjects for the give predicate and object.
func (m *memory) Subjects(p *predicate.Predicate, o *triple.Object, lo *storage.LookupOptions) (storage.Nodes, error) {
pGUID := p.GUID()
oGUID := o.GUID()
poIdx := strings.Join([]string{pGUID, oGUID}, ":")
m.rwmu.RLock()
subs := make(chan *node.Node, len(m.idxPO[poIdx]))
go func() {
ckr := newChecker(lo)
for _, t := range m.idxPO[poIdx] {
if ckr.CheckAndUpdate(t.P()) {
subs <- t.S()
}
}
m.rwmu.RUnlock()
close(subs)
}()
return subs, nil
}
// objectToCell returns a cell containing the data boxed in the object.
func objectToCell(o *triple.Object) (*table.Cell, error) {
c := &table.Cell{}
if n, err := o.Node(); err == nil {
c.N = n
return c, nil
}
if p, err := o.Predicate(); err == nil {
c.P = p
return c, nil
}
if l, err := o.Literal(); err == nil {
c.L = l
return c, nil
}
return nil, fmt.Errorf("unknown object type in object %q", o)
}
