func (qs *QuadStore) NameOf(v graph.Value) quad.Value {
if v == nil {
return nil
} else if v, ok := v.(graph.PreFetchedValue); ok {
return v.NameOf()
}
hash := v.(NodeHash)
if hash == "" {
return nil
}
if val, ok := qs.ids.Get(string(hash)); ok {
return val.(quad.Value)
}
var node MongoNode
err := qs.db.C("nodes").FindId(string(hash)).One(&node)
if err != nil {
clog.Errorf("Error: Couldn't retrieve node %s %v", v, err)
}
qv := toQuadValue(node.Name)
if node.ID != "" && qv != nil {
qs.ids.Put(string(hash), qv)
}
return qv
}
