// Copyright 2013 Prometheus Team
// 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 leveldb

import (
	"github.com/jmhodges/levigo"
	"github.com/prometheus/prometheus/coding"
)

type batch struct {
	batch *levigo.WriteBatch
}

func NewBatch() batch {
	return batch{
		batch: levigo.NewWriteBatch(),
	}
}

func (b batch) Drop(key coding.Encoder) {
	keyEncoded, err := key.Encode()
	if err != nil {
		panic(err)
	}

	b.batch.Delete(keyEncoded)
}

func (b batch) Put(key, value coding.Encoder) {
	keyEncoded, err := key.Encode()
	if err != nil {
		panic(err)
	}
	valueEncoded, err := value.Encode()
	if err != nil {
		panic(err)
	}

	b.batch.Put(keyEncoded, valueEncoded)
}

func (b batch) Close() (err error) {
	b.batch.Close()

	return
}