Adding upstream version 2.5.1.

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

index/upsidedown/store/moss/batch.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"
+
+	store "github.com/blevesearch/upsidedown_store_api"
+)
+
+type Batch struct {
+	store   *Store
+	merge   *store.EmulatedMerge
+	batch   moss.Batch
+	buf     []byte // Non-nil when using pre-alloc'ed / NewBatchEx().
+	bufUsed int
+}
+
+func (b *Batch) Set(key, val []byte) {
+	var err error
+	if b.buf != nil {
+		b.bufUsed += len(key) + len(val)
+		err = b.batch.AllocSet(key, val)
+	} else {
+		err = b.batch.Set(key, val)
+	}
+
+	if err != nil {
+		b.store.Logf("bleve moss batch.Set err: %v", err)
+	}
+}
+
+func (b *Batch) Delete(key []byte) {
+	var err error
+	if b.buf != nil {
+		b.bufUsed += len(key)
+		err = b.batch.AllocDel(key)
+	} else {
+		err = b.batch.Del(key)
+	}
+
+	if err != nil {
+		b.store.Logf("bleve moss batch.Delete err: %v", err)
+	}
+}
+
+func (b *Batch) Merge(key, val []byte) {
+	if b.buf != nil {
+		b.bufUsed += len(key) + len(val)
+	}
+	b.merge.Merge(key, val)
+}
+
+func (b *Batch) Reset() {
+	err := b.Close()
+	if err != nil {
+		b.store.Logf("bleve moss batch.Close err: %v", err)
+		return
+	}
+
+	batch, err := b.store.ms.NewBatch(0, 0)
+	if err == nil {
+		b.batch = batch
+		b.merge = store.NewEmulatedMerge(b.store.mo)
+		b.buf = nil
+		b.bufUsed = 0
+	}
+}
+
+func (b *Batch) Close() error {
+	b.merge = nil
+	err := b.batch.Close()
+	b.batch = nil
+	return err
+}