Adding upstream version 2.5.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

index/upsidedown/store/moss/iterator.go

@@ -0,0 +1,87 @@
+//  Copyright (c) 2016 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package moss
+
+import (
+	"github.com/couchbase/moss"
+)
+
+type Iterator struct {
+	store *Store
+	ss    moss.Snapshot
+	iter  moss.Iterator
+	start []byte
+	end   []byte
+	k     []byte
+	v     []byte
+	err   error
+}
+
+func (x *Iterator) Seek(seekToKey []byte) {
+	_ = x.iter.SeekTo(seekToKey)
+
+	x.k, x.v, x.err = x.iter.Current()
+}
+
+func (x *Iterator) Next() {
+	_ = x.iter.Next()
+
+	x.k, x.v, x.err = x.iter.Current()
+}
+
+func (x *Iterator) Current() ([]byte, []byte, bool) {
+	return x.k, x.v, x.err == nil
+}
+
+func (x *Iterator) Key() []byte {
+	if x.err != nil {
+		return nil
+	}
+
+	return x.k
+}
+
+func (x *Iterator) Value() []byte {
+	if x.err != nil {
+		return nil
+	}
+
+	return x.v
+}
+
+func (x *Iterator) Valid() bool {
+	return x.err == nil
+}
+
+func (x *Iterator) Close() error {
+	var err error
+
+	x.ss = nil
+
+	if x.iter != nil {
+		err = x.iter.Close()
+		x.iter = nil
+	}
+
+	x.k = nil
+	x.v = nil
+	x.err = moss.ErrIteratorDone
+
+	return err
+}
+
+func (x *Iterator) current() {
+	x.k, x.v, x.err = x.iter.Current()
+}