//  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 leveldb

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

type LevelDBIterator struct {
	store    *LevelDBStore
	iterator *levigo.Iterator
}

func newLevelDBIterator(store *LevelDBStore) *LevelDBIterator {
	rv := LevelDBIterator{
		store:    store,
		iterator: store.db.NewIterator(defaultReadOptions()),
	}
	return &rv
}

func (ldi *LevelDBIterator) SeekFirst() {
	ldi.iterator.SeekToFirst()
}

func (ldi *LevelDBIterator) Seek(key []byte) {
	ldi.iterator.Seek(key)
}

func (ldi *LevelDBIterator) Next() {
	ldi.iterator.Next()
}

func (ldi *LevelDBIterator) Current() ([]byte, []byte, bool) {
	if ldi.Valid() {
		return ldi.Key(), ldi.Value(), true
	}
	return nil, nil, false
}

func (ldi *LevelDBIterator) Key() []byte {
	return ldi.iterator.Key()
}

func (ldi *LevelDBIterator) Value() []byte {
	return ldi.iterator.Value()
}

func (ldi *LevelDBIterator) Valid() bool {
	return ldi.iterator.Valid()
}

func (ldi *LevelDBIterator) Close() {
	ldi.iterator.Close()
}