Adding upstream version 2.5.1.

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

index/upsidedown/store/gtreap/reader.go

@@ -0,0 +1,66 @@
+//  Copyright (c) 2015 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 gtreap provides an in-memory implementation of the
+// KVStore interfaces using the gtreap balanced-binary treap,
+// copy-on-write data structure.
+package gtreap
+
+import (
+	"github.com/blevesearch/upsidedown_store_api"
+
+	"github.com/blevesearch/gtreap"
+)
+
+type Reader struct {
+	t *gtreap.Treap
+}
+
+func (w *Reader) Get(k []byte) (v []byte, err error) {
+	var rv []byte
+	itm := w.t.Get(&Item{k: k})
+	if itm != nil {
+		rv = make([]byte, len(itm.(*Item).v))
+		copy(rv, itm.(*Item).v)
+		return rv, nil
+	}
+	return nil, nil
+}
+
+func (r *Reader) MultiGet(keys [][]byte) ([][]byte, error) {
+	return store.MultiGet(r, keys)
+}
+
+func (w *Reader) PrefixIterator(k []byte) store.KVIterator {
+	rv := Iterator{
+		t:      w.t,
+		prefix: k,
+	}
+	rv.restart(&Item{k: k})
+	return &rv
+}
+
+func (w *Reader) RangeIterator(start, end []byte) store.KVIterator {
+	rv := Iterator{
+		t:     w.t,
+		start: start,
+		end:   end,
+	}
+	rv.restart(&Item{k: start})
+	return &rv
+}
+
+func (w *Reader) Close() error {
+	return nil
+}