func NewMongoIterator(ts *MongoTripleStore, collection string, dir string, val graph.TSVal) *MongoIterator { var m MongoIterator graph.BaseIteratorInit(&m.BaseIterator) m.name = ts.GetNameFor(val) m.collection = collection switch dir { case "s": m.constraint = bson.M{"Sub": m.name} case "p": m.constraint = bson.M{"Pred": m.name} case "o": m.constraint = bson.M{"Obj": m.name} case "c": m.constraint = bson.M{"Provenance": m.name} } m.ts = ts m.dir = dir m.iter = ts.db.C(collection).Find(m.constraint).Iter() size, err := ts.db.C(collection).Find(m.constraint).Count() if err != nil { glog.Errorln("Trouble getting size for iterator! ", err) return nil } m.size = int64(size) m.hash = val.(string) m.isAll = false return &m }
func NewLlrbIterator(tree *llrb.LLRB, data string) *LlrbIterator { var it LlrbIterator graph.BaseIteratorInit(&it.BaseIterator) it.tree = tree it.iterLast = Int64(-1) it.data = data return &it }
func NewLevelDBAllIterator(prefix, dir string, ts *LevelDBTripleStore) *LevelDBAllIterator { var it LevelDBAllIterator graph.BaseIteratorInit(&it.BaseIterator) it.ro = &leveldb_opt.ReadOptions{} it.ro.DontFillCache = true it.it = ts.db.NewIterator(nil, it.ro) it.prefix = []byte(prefix) it.dir = dir it.open = true it.ts = ts it.it.Seek(it.prefix) if !it.it.Valid() { it.open = false it.it.Release() } return &it }
func NewLevelDBIterator(prefix, dir string, value graph.TSVal, ts *LevelDBTripleStore) *LevelDBIterator { var it LevelDBIterator graph.BaseIteratorInit(&it.BaseIterator) it.checkId = value.([]byte) it.dir = dir it.originalPrefix = prefix it.nextPrefix = make([]byte, 0, 2+ts.hasher.Size()) it.nextPrefix = append(it.nextPrefix, []byte(prefix)...) it.nextPrefix = append(it.nextPrefix, []byte(it.checkId[1:])...) it.ro = &leveldb_opt.ReadOptions{} it.ro.DontFillCache = true it.it = ts.db.NewIterator(nil, it.ro) it.open = true it.ts = ts ok := it.it.Seek(it.nextPrefix) if !ok { it.open = false it.it.Release() } return &it }