Method GetFacts

factstore/factstore.go:414–433

GetFacts implementation that looks up facts from an in-memory map.

(a ast.Atom, fn func(ast.Atom) error)

// GetFacts implementation that looks up facts from an in-memory map.
func (s IndexedInMemoryStore) GetFacts(a ast.Atom, fn func(ast.Atom) error) error {
	if a.Predicate.Arity == 0 {
		if a, ok := s.constants[a.Predicate]; ok {
			return fn(a)
		}
		return nil
	}
	if _, ok := a.Args[0].(ast.Variable); ok {
		return s.getFactsOfFirstVariable(a, fn)
	}
	h := a.Args[0].Hash()
	for _, fact := range s.shardsByPredicate[a.Predicate][h] {
		if Matches(a.Args, fact.Args) {
			if err := fn(fact); err != nil {
				return err
			}
		}
	}
	return nil
}

// Add implements the FactStore interface by adding the fact to the backing map.
func (s IndexedInMemoryStore) Add(a ast.Atom) bool {