Adding upstream version 2.5.1.

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

index/upsidedown/store/goleveldb/batch.go

@@ -0,0 +1,50 @@
+//  Copyright (c) 2014 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 goleveldb
+
+import (
+	"github.com/blevesearch/goleveldb/leveldb"
+	store "github.com/blevesearch/upsidedown_store_api"
+)
+
+type Batch struct {
+	store *Store
+	merge *store.EmulatedMerge
+	batch *leveldb.Batch
+}
+
+func (b *Batch) Set(key, val []byte) {
+	b.batch.Put(key, val)
+}
+
+func (b *Batch) Delete(key []byte) {
+	b.batch.Delete(key)
+}
+
+func (b *Batch) Merge(key, val []byte) {
+	b.merge.Merge(key, val)
+}
+
+func (b *Batch) Reset() {
+	b.batch.Reset()
+	b.merge = store.NewEmulatedMerge(b.store.mo)
+}
+
+func (b *Batch) Close() error {
+	b.batch.Reset()
+	b.batch = nil
+	b.merge = nil
+	return nil
+}