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This commit is contained in:
kortschak 2014-06-28 13:29:16 +09:30
parent 913d567ae1
commit 40f3363cde
20 changed files with 188 additions and 189 deletions
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40
graph/leveldb/all_iterator.go
View file

@ -19,26 +19,26 @@ import (
"fmt"
"strings"
leveldb_it "github.com/syndtr/goleveldb/leveldb/iterator"
leveldb_opt "github.com/syndtr/goleveldb/leveldb/opt"
"github.com/syndtr/goleveldb/leveldb/iterator"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/google/cayley/graph"
)
type LevelDBAllIterator struct {
type AllIterator struct {
graph.BaseIterator
prefix []byte
dir string
open bool
it leveldb_it.Iterator
ts *LevelDBTripleStore
ro *leveldb_opt.ReadOptions
it iterator.Iterator
ts *TripleStore
ro *opt.ReadOptions
}
func NewLevelDBAllIterator(prefix, dir string, ts *LevelDBTripleStore) *LevelDBAllIterator {
var it LevelDBAllIterator
func NewLevelDBAllIterator(prefix, dir string, ts *TripleStore) *AllIterator {
var it AllIterator
graph.BaseIteratorInit(&it.BaseIterator)
it.ro = &leveldb_opt.ReadOptions{}
it.ro = &opt.ReadOptions{}
it.ro.DontFillCache = true
it.it = ts.db.NewIterator(nil, it.ro)
it.prefix = []byte(prefix)
@ -53,7 +53,7 @@ func NewLevelDBAllIterator(prefix, dir string, ts *LevelDBTripleStore) *LevelDBA
return &it
}
func (a *LevelDBAllIterator) Reset() {
func (a *AllIterator) Reset() {
if !a.open {
a.it = a.ts.db.NewIterator(nil, a.ro)
a.open = true
@ -65,13 +65,13 @@ func (a *LevelDBAllIterator) Reset() {
}
}
func (a *LevelDBAllIterator) Clone() graph.Iterator {
func (a *AllIterator) Clone() graph.Iterator {
out := NewLevelDBAllIterator(string(a.prefix), a.dir, a.ts)
out.CopyTagsFrom(a)
return out
}
func (a *LevelDBAllIterator) Next() (graph.TSVal, bool) {
func (a *AllIterator) Next() (graph.TSVal, bool) {
if !a.open {
a.Last = nil
return nil, false
@ -91,19 +91,19 @@ func (a *LevelDBAllIterator) Next() (graph.TSVal, bool) {
return out, true
}
func (a *LevelDBAllIterator) Check(v graph.TSVal) bool {
func (a *AllIterator) Check(v graph.TSVal) bool {
a.Last = v
return true
}
func (lit *LevelDBAllIterator) Close() {
func (lit *AllIterator) Close() {
if lit.open {
lit.it.Release()
lit.open = false
}
}
func (a *LevelDBAllIterator) Size() (int64, bool) {
func (a *AllIterator) Size() (int64, bool) {
size, err := a.ts.GetApproximateSizeForPrefix(a.prefix)
if err == nil {
return size, false
@ -112,19 +112,19 @@ func (a *LevelDBAllIterator) Size() (int64, bool) {
return int64(^uint64(0) >> 1), false
}
func (lit *LevelDBAllIterator) DebugString(indent int) string {
func (lit *AllIterator) DebugString(indent int) string {
size, _ := lit.Size()
return fmt.Sprintf("%s(%s tags: %v leveldb size:%d %s %p)", strings.Repeat(" ", indent), lit.Type(), lit.Tags(), size, lit.dir, lit)
}
func (lit *LevelDBAllIterator) Type() string { return "all" }
func (lit *LevelDBAllIterator) Sorted() bool { return false }
func (lit *AllIterator) Type() string { return "all" }
func (lit *AllIterator) Sorted() bool { return false }
func (lit *LevelDBAllIterator) Optimize() (graph.Iterator, bool) {
func (lit *AllIterator) Optimize() (graph.Iterator, bool) {
return lit, false
}
func (lit *LevelDBAllIterator) GetStats() *graph.IteratorStats {
func (lit *AllIterator) GetStats() *graph.IteratorStats {
s, _ := lit.Size()
return &graph.IteratorStats{
CheckCost: 1,

45
graph/leveldb/iterator.go
View file

@ -16,30 +16,29 @@ package leveldb
import (
"bytes"
_ "encoding/binary"
"fmt"
"strings"
leveldb_it "github.com/syndtr/goleveldb/leveldb/iterator"
leveldb_opt "github.com/syndtr/goleveldb/leveldb/opt"
"github.com/syndtr/goleveldb/leveldb/iterator"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/google/cayley/graph"
)
type LevelDBIterator struct {
type Iterator struct {
graph.BaseIterator
nextPrefix []byte
checkId []byte
dir string
open bool
it leveldb_it.Iterator
ts *LevelDBTripleStore
ro *leveldb_opt.ReadOptions
it iterator.Iterator
ts *TripleStore
ro *opt.ReadOptions
originalPrefix string
}
func NewLevelDBIterator(prefix, dir string, value graph.TSVal, ts *LevelDBTripleStore) *LevelDBIterator {
var it LevelDBIterator
func NewIterator(prefix, dir string, value graph.TSVal, ts *TripleStore) *Iterator {
var it Iterator
graph.BaseIteratorInit(&it.BaseIterator)
it.checkId = value.([]byte)
it.dir = dir
@ -47,7 +46,7 @@ func NewLevelDBIterator(prefix, dir string, value graph.TSVal, ts *LevelDBTriple
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 = &opt.ReadOptions{}
it.ro.DontFillCache = true
it.it = ts.db.NewIterator(nil, it.ro)
it.open = true
@ -60,7 +59,7 @@ func NewLevelDBIterator(prefix, dir string, value graph.TSVal, ts *LevelDBTriple
return &it
}
func (lit *LevelDBIterator) Reset() {
func (lit *Iterator) Reset() {
if !lit.open {
lit.it = lit.ts.db.NewIterator(nil, lit.ro)
lit.open = true
@ -72,20 +71,20 @@ func (lit *LevelDBIterator) Reset() {
}
}
func (lit *LevelDBIterator) Clone() graph.Iterator {
out := NewLevelDBIterator(lit.originalPrefix, lit.dir, lit.checkId, lit.ts)
func (lit *Iterator) Clone() graph.Iterator {
out := NewIterator(lit.originalPrefix, lit.dir, lit.checkId, lit.ts)
out.CopyTagsFrom(lit)
return out
}
func (lit *LevelDBIterator) Close() {
func (lit *Iterator) Close() {
if lit.open {
lit.it.Release()
lit.open = false
}
}
func (lit *LevelDBIterator) Next() (graph.TSVal, bool) {
func (lit *Iterator) Next() (graph.TSVal, bool) {
if lit.it == nil {
lit.Last = nil
return nil, false
@ -114,7 +113,7 @@ func (lit *LevelDBIterator) Next() (graph.TSVal, bool) {
return nil, false
}
func GetPositionFromPrefix(prefix []byte, dir string, ts *LevelDBTripleStore) int {
func GetPositionFromPrefix(prefix []byte, dir string, ts *TripleStore) int {
if bytes.Equal(prefix, []byte("sp")) {
switch dir {
case "s":
@ -166,7 +165,7 @@ func GetPositionFromPrefix(prefix []byte, dir string, ts *LevelDBTripleStore) in
panic("Notreached")
}
func (lit *LevelDBIterator) Check(v graph.TSVal) bool {
func (lit *Iterator) Check(v graph.TSVal) bool {
val := v.([]byte)
if val[0] == 'z' {
return false
@ -186,23 +185,23 @@ func (lit *LevelDBIterator) Check(v graph.TSVal) bool {
return false
}
func (lit *LevelDBIterator) Size() (int64, bool) {
func (lit *Iterator) Size() (int64, bool) {
return lit.ts.GetSizeFor(lit.checkId), true
}
func (lit *LevelDBIterator) DebugString(indent int) string {
func (lit *Iterator) DebugString(indent int) string {
size, _ := lit.Size()
return fmt.Sprintf("%s(%s %d tags: %v dir: %s size:%d %s)", strings.Repeat(" ", indent), lit.Type(), lit.GetUid(), lit.Tags(), lit.dir, size, lit.ts.GetNameFor(lit.checkId))
}
func (lit *LevelDBIterator) Type() string { return "leveldb" }
func (lit *LevelDBIterator) Sorted() bool { return false }
func (lit *Iterator) Type() string { return "leveldb" }
func (lit *Iterator) Sorted() bool { return false }
func (lit *LevelDBIterator) Optimize() (graph.Iterator, bool) {
func (lit *Iterator) Optimize() (graph.Iterator, bool) {
return lit, false
}
func (lit *LevelDBIterator) GetStats() *graph.IteratorStats {
func (lit *Iterator) GetStats() *graph.IteratorStats {
s, _ := lit.Size()
return &graph.IteratorStats{
CheckCost: 1,

20
graph/leveldb/leveldb_test.go
View file

@ -79,7 +79,7 @@ func TestCreateDatabase(t *testing.T) {
ok := CreateNewLevelDB(tmpDir)
So(ok, ShouldBeTrue)
Convey("And has good defaults for a new database", func() {
ts := NewDefaultLevelDBTripleStore(tmpDir, nil)
ts := NewTripleStore(tmpDir, nil)
So(ts, ShouldNotBeNil)
So(ts.Size(), ShouldEqual, 0)
ts.Close()
@ -89,7 +89,7 @@ func TestCreateDatabase(t *testing.T) {
Convey("Fails if it cannot create the database", func() {
ok := CreateNewLevelDB("/dev/null/some terrible path")
So(ok, ShouldBeFalse)
So(func() { NewDefaultLevelDBTripleStore("/dev/null/some terrible path", nil) }, ShouldPanic)
So(func() { NewTripleStore("/dev/null/some terrible path", nil) }, ShouldPanic)
})
Reset(func() {
@ -101,14 +101,14 @@ func TestCreateDatabase(t *testing.T) {
}
func TestLoadDatabase(t *testing.T) {
var ts *LevelDBTripleStore
var ts *TripleStore
Convey("Given a created database path", t, func() {
tmpDir, _ := ioutil.TempDir(os.TempDir(), "cayley_test")
t.Log(tmpDir)
ok := CreateNewLevelDB(tmpDir)
So(ok, ShouldBeTrue)
ts = NewDefaultLevelDBTripleStore(tmpDir, nil)
ts = NewTripleStore(tmpDir, nil)
Convey("Can load a single triple", func() {
ts.AddTriple(graph.MakeTriple("Something", "points_to", "Something Else", "context"))
@ -139,7 +139,7 @@ func TestLoadDatabase(t *testing.T) {
}
func TestIterator(t *testing.T) {
var ts *LevelDBTripleStore
var ts *TripleStore
Convey("Given a prepared database", t, func() {
tmpDir, _ := ioutil.TempDir(os.TempDir(), "cayley_test")
@ -147,7 +147,7 @@ func TestIterator(t *testing.T) {
defer os.RemoveAll(tmpDir)
ok := CreateNewLevelDB(tmpDir)
So(ok, ShouldBeTrue)
ts = NewDefaultLevelDBTripleStore(tmpDir, nil)
ts = NewTripleStore(tmpDir, nil)
ts.AddTripleSet(makeTripleSet())
var it graph.Iterator
@ -234,7 +234,7 @@ func TestIterator(t *testing.T) {
}
func TestSetIterator(t *testing.T) {
var ts *LevelDBTripleStore
var ts *TripleStore
var tmpDir string
Convey("Given a prepared database", t, func() {
@ -243,7 +243,7 @@ func TestSetIterator(t *testing.T) {
defer os.RemoveAll(tmpDir)
ok := CreateNewLevelDB(tmpDir)
So(ok, ShouldBeTrue)
ts = NewDefaultLevelDBTripleStore(tmpDir, nil)
ts = NewTripleStore(tmpDir, nil)
ts.AddTripleSet(makeTripleSet())
var it graph.Iterator
@ -383,7 +383,7 @@ func TestSetIterator(t *testing.T) {
}
func TestOptimize(t *testing.T) {
var ts *LevelDBTripleStore
var ts *TripleStore
var lto graph.Iterator
var tmpDir string
@ -393,7 +393,7 @@ func TestOptimize(t *testing.T) {
defer os.RemoveAll(tmpDir)
ok := CreateNewLevelDB(tmpDir)
So(ok, ShouldBeTrue)
ts = NewDefaultLevelDBTripleStore(tmpDir, nil)
ts = NewTripleStore(tmpDir, nil)
ts.AddTripleSet(makeTripleSet())
Convey("With an linksto-fixed pair", func() {

66
graph/leveldb/triplestore.go
View file

@ -34,7 +34,7 @@ import (
const DefaultCacheSize = 2
const DefaultWriteBufferSize = 20
type LevelDBTripleStore struct {
type TripleStore struct {
dbOpts *leveldb_opt.Options
db *leveldb.DB
path string
@ -53,7 +53,7 @@ func CreateNewLevelDB(path string) bool {
return false
}
defer db.Close()
ts := &LevelDBTripleStore{}
ts := &TripleStore{}
ts.db = db
ts.writeopts = &leveldb_opt.WriteOptions{
Sync: true,
@ -62,8 +62,8 @@ func CreateNewLevelDB(path string) bool {
return true
}
func NewDefaultLevelDBTripleStore(path string, options graph.OptionsDict) *LevelDBTripleStore {
var ts LevelDBTripleStore
func NewTripleStore(path string, options graph.OptionsDict) *TripleStore {
var ts TripleStore
ts.path = path
cache_size := DefaultCacheSize
if val, ok := options.GetIntKey("cache_size_mb"); ok {
@ -94,7 +94,7 @@ func NewDefaultLevelDBTripleStore(path string, options graph.OptionsDict) *Level
return &ts
}
func (ts *LevelDBTripleStore) GetStats() string {
func (ts *TripleStore) GetStats() string {
out := ""
stats, err := ts.db.GetProperty("leveldb.stats")
if err == nil {
@ -104,11 +104,11 @@ func (ts *LevelDBTripleStore) GetStats() string {
return out
}
func (ts *LevelDBTripleStore) Size() int64 {
func (ts *TripleStore) Size() int64 {
return ts.size
}
func (ts *LevelDBTripleStore) createKeyFor(dir1, dir2, dir3 string, triple *graph.Triple) []byte {
func (ts *TripleStore) createKeyFor(dir1, dir2, dir3 string, triple *graph.Triple) []byte {
key := make([]byte, 0, 2+(ts.hasher.Size()*3))
key = append(key, []byte(dir1+dir2)...)
key = append(key, ts.convertStringToByteHash(triple.Get(dir1))...)
@ -117,7 +117,7 @@ func (ts *LevelDBTripleStore) createKeyFor(dir1, dir2, dir3 string, triple *grap
return key
}
func (ts *LevelDBTripleStore) createProvKeyFor(dir1, dir2, dir3 string, triple *graph.Triple) []byte {
func (ts *TripleStore) createProvKeyFor(dir1, dir2, dir3 string, triple *graph.Triple) []byte {
key := make([]byte, 0, 2+(ts.hasher.Size()*4))
key = append(key, []byte("c"+dir1)...)
key = append(key, ts.convertStringToByteHash(triple.Get("c"))...)
@ -127,14 +127,14 @@ func (ts *LevelDBTripleStore) createProvKeyFor(dir1, dir2, dir3 string, triple *
return key
}
func (ts *LevelDBTripleStore) createValueKeyFor(s string) []byte {
func (ts *TripleStore) createValueKeyFor(s string) []byte {
key := make([]byte, 0, 1+ts.hasher.Size())
key = append(key, []byte("z")...)
key = append(key, ts.convertStringToByteHash(s)...)
return key
}
func (ts *LevelDBTripleStore) AddTriple(t *graph.Triple) {
func (ts *TripleStore) AddTriple(t *graph.Triple) {
batch := &leveldb.Batch{}
ts.buildWrite(batch, t)
err := ts.db.Write(batch, ts.writeopts)
@ -145,7 +145,7 @@ func (ts *LevelDBTripleStore) AddTriple(t *graph.Triple) {
ts.size++
}
func (ts *LevelDBTripleStore) RemoveTriple(t *graph.Triple) {
func (ts *TripleStore) RemoveTriple(t *graph.Triple) {
_, err := ts.db.Get(ts.createKeyFor("s", "p", "o", t), ts.readopts)
if err != nil && err != leveldb.ErrNotFound {
glog.Errorf("Couldn't access DB to confirm deletion")
@ -174,7 +174,7 @@ func (ts *LevelDBTripleStore) RemoveTriple(t *graph.Triple) {
ts.size--
}
func (ts *LevelDBTripleStore) buildTripleWrite(batch *leveldb.Batch, t *graph.Triple) {
func (ts *TripleStore) buildTripleWrite(batch *leveldb.Batch, t *graph.Triple) {
bytes, err := json.Marshal(*t)
if err != nil {
glog.Errorf("Couldn't write to buffer for triple %s\n %s\n", t.ToString(), err)
@ -188,7 +188,7 @@ func (ts *LevelDBTripleStore) buildTripleWrite(batch *leveldb.Batch, t *graph.Tr
}
}
func (ts *LevelDBTripleStore) buildWrite(batch *leveldb.Batch, t *graph.Triple) {
func (ts *TripleStore) buildWrite(batch *leveldb.Batch, t *graph.Triple) {
ts.buildTripleWrite(batch, t)
ts.UpdateValueKeyBy(t.Get("s"), 1, nil)
ts.UpdateValueKeyBy(t.Get("p"), 1, nil)
@ -203,7 +203,7 @@ type ValueData struct {
Size int64
}
func (ts *LevelDBTripleStore) UpdateValueKeyBy(name string, amount int, batch *leveldb.Batch) {
func (ts *TripleStore) UpdateValueKeyBy(name string, amount int, batch *leveldb.Batch) {
value := &ValueData{name, int64(amount)}
key := ts.createValueKeyFor(name)
b, err := ts.db.Get(key, ts.readopts)
@ -249,7 +249,7 @@ func (ts *LevelDBTripleStore) UpdateValueKeyBy(name string, amount int, batch *l
}
}
func (ts *LevelDBTripleStore) AddTripleSet(t_s []*graph.Triple) {
func (ts *TripleStore) AddTripleSet(t_s []*graph.Triple) {
batch := &leveldb.Batch{}
newTs := len(t_s)
resizeMap := make(map[string]int)
@ -273,7 +273,7 @@ func (ts *LevelDBTripleStore) AddTripleSet(t_s []*graph.Triple) {
ts.size += int64(newTs)
}
func (ldbts *LevelDBTripleStore) Close() {
func (ldbts *TripleStore) Close() {
buf := new(bytes.Buffer)
err := binary.Write(buf, binary.LittleEndian, ldbts.size)
if err == nil {
@ -288,7 +288,7 @@ func (ldbts *LevelDBTripleStore) Close() {
ldbts.open = false
}
func (ts *LevelDBTripleStore) GetTriple(k graph.TSVal) *graph.Triple {
func (ts *TripleStore) GetTriple(k graph.TSVal) *graph.Triple {
var triple graph.Triple
b, err := ts.db.Get(k.([]byte), ts.readopts)
if err != nil && err != leveldb.ErrNotFound {
@ -307,7 +307,7 @@ func (ts *LevelDBTripleStore) GetTriple(k graph.TSVal) *graph.Triple {
return &triple
}
func (ts *LevelDBTripleStore) convertStringToByteHash(s string) []byte {
func (ts *TripleStore) convertStringToByteHash(s string) []byte {
ts.hasher.Reset()
key := make([]byte, 0, ts.hasher.Size())
ts.hasher.Write([]byte(s))
@ -315,11 +315,11 @@ func (ts *LevelDBTripleStore) convertStringToByteHash(s string) []byte {
return key
}
func (ts *LevelDBTripleStore) GetIdFor(s string) graph.TSVal {
func (ts *TripleStore) GetIdFor(s string) graph.TSVal {
return ts.createValueKeyFor(s)
}
func (ts *LevelDBTripleStore) getValueData(value_key []byte) ValueData {
func (ts *TripleStore) getValueData(value_key []byte) ValueData {
var out ValueData
if glog.V(3) {
glog.V(3).Infof("%s %v\n", string(value_key[0]), value_key)
@ -339,7 +339,7 @@ func (ts *LevelDBTripleStore) getValueData(value_key []byte) ValueData {
return out
}
func (ts *LevelDBTripleStore) GetNameFor(k graph.TSVal) string {
func (ts *TripleStore) GetNameFor(k graph.TSVal) string {
if k == nil {
glog.V(2).Infoln("k was nil")
return ""
@ -347,14 +347,14 @@ func (ts *LevelDBTripleStore) GetNameFor(k graph.TSVal) string {
return ts.getValueData(k.([]byte)).Name
}
func (ts *LevelDBTripleStore) GetSizeFor(k graph.TSVal) int64 {
func (ts *TripleStore) GetSizeFor(k graph.TSVal) int64 {
if k == nil {
return 0
}
return int64(ts.getValueData(k.([]byte)).Size)
}
func (ts *LevelDBTripleStore) getSize() {
func (ts *TripleStore) getSize() {
var size int64
b, err := ts.db.Get([]byte("__size"), ts.readopts)
if err != nil && err != leveldb.ErrNotFound {
@ -373,7 +373,7 @@ func (ts *LevelDBTripleStore) getSize() {
ts.size = size
}
func (ts *LevelDBTripleStore) GetApproximateSizeForPrefix(pre []byte) (int64, error) {
func (ts *TripleStore) GetApproximateSizeForPrefix(pre []byte) (int64, error) {
limit := make([]byte, len(pre))
copy(limit, pre)
end := len(limit) - 1
@ -388,29 +388,29 @@ func (ts *LevelDBTripleStore) GetApproximateSizeForPrefix(pre []byte) (int64, er
return 0, nil
}
func (ts *LevelDBTripleStore) GetTripleIterator(dir string, val graph.TSVal) graph.Iterator {
func (ts *TripleStore) GetTripleIterator(dir string, val graph.TSVal) graph.Iterator {
switch dir {
case "s":
return NewLevelDBIterator("sp", "s", val, ts)
return NewIterator("sp", "s", val, ts)
case "p":
return NewLevelDBIterator("po", "p", val, ts)
return NewIterator("po", "p", val, ts)
case "o":
return NewLevelDBIterator("os", "o", val, ts)
return NewIterator("os", "o", val, ts)
case "c":
return NewLevelDBIterator("cp", "c", val, ts)
return NewIterator("cp", "c", val, ts)
}
panic("Notreached " + dir)
}
func (ts *LevelDBTripleStore) GetNodesAllIterator() graph.Iterator {
func (ts *TripleStore) GetNodesAllIterator() graph.Iterator {
return NewLevelDBAllIterator("z", "v", ts)
}
func (ts *LevelDBTripleStore) GetTriplesAllIterator() graph.Iterator {
func (ts *TripleStore) GetTriplesAllIterator() graph.Iterator {
return NewLevelDBAllIterator("po", "p", ts)
}
func (ts *LevelDBTripleStore) GetTripleDirection(val graph.TSVal, direction string) graph.TSVal {
func (ts *TripleStore) GetTripleDirection(val graph.TSVal, direction string) graph.TSVal {
v := val.([]uint8)
offset := GetPositionFromPrefix(v[0:2], direction, ts)
if offset != -1 {
@ -424,6 +424,6 @@ func compareBytes(a, b graph.TSVal) bool {
return bytes.Equal(a.([]uint8), b.([]uint8))
}
func (ts *LevelDBTripleStore) MakeFixed() *graph.FixedIterator {
func (ts *TripleStore) MakeFixed() *graph.FixedIterator {
return graph.NewFixedIteratorWithCompare(compareBytes)
}

4
graph/leveldb/triplestore_iterator_optimize.go
View file

@ -18,7 +18,7 @@ import (
"github.com/google/cayley/graph"
)
func (ts *LevelDBTripleStore) OptimizeIterator(it graph.Iterator) (graph.Iterator, bool) {
func (ts *TripleStore) OptimizeIterator(it graph.Iterator) (graph.Iterator, bool) {
switch it.Type() {
case "linksto":
return ts.optimizeLinksTo(it.(*graph.LinksToIterator))
@ -27,7 +27,7 @@ func (ts *LevelDBTripleStore) OptimizeIterator(it graph.Iterator) (graph.Iterato
return it, false
}
func (ts *LevelDBTripleStore) optimizeLinksTo(it *graph.LinksToIterator) (graph.Iterator, bool) {
func (ts *TripleStore) optimizeLinksTo(it *graph.LinksToIterator) (graph.Iterator, bool) {
l := it.GetSubIterators()
if l.Len() != 1 {
return it, false