106 lines
2.2 KiB
Go
106 lines
2.2 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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// +build forestdb
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package forestdb
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import (
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"github.com/couchbaselabs/goforestdb"
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)
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type Iterator struct {
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store *Store
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snapshot *forestdb.KVStore
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iterator *forestdb.Iterator
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curr *forestdb.Doc
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valid bool
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}
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func newIterator(store *Store) *Iterator {
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itr, err := store.dbkv.IteratorInit([]byte{}, nil, forestdb.ITR_NONE)
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rv := Iterator{
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store: store,
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iterator: itr,
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valid: err == nil,
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}
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return &rv
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}
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func newIteratorWithSnapshot(store *Store, snapshot *forestdb.KVStore) *Iterator {
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itr, err := snapshot.IteratorInit([]byte{}, nil, forestdb.ITR_NONE)
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rv := Iterator{
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store: store,
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iterator: itr,
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valid: err == nil,
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}
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return &rv
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}
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func (i *Iterator) SeekFirst() {
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err := i.iterator.SeekMin()
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if err != nil {
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i.valid = false
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return
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}
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i.curr, err = i.iterator.Get()
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if err != nil {
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i.valid = false
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}
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}
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func (i *Iterator) Seek(key []byte) {
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err := i.iterator.Seek(key, forestdb.FDB_ITR_SEEK_HIGHER)
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if err != nil {
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i.valid = false
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return
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}
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i.curr, err = i.iterator.Get()
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if err != nil {
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i.valid = false
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return
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}
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}
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func (i *Iterator) Next() {
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err := i.iterator.Next()
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if err != nil {
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i.valid = false
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return
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}
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i.curr, err = i.iterator.Get()
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if err != nil {
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i.valid = false
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}
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}
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func (i *Iterator) Current() ([]byte, []byte, bool) {
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if i.Valid() {
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return i.Key(), i.Value(), true
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}
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return nil, nil, false
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}
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func (i *Iterator) Key() []byte {
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return i.curr.Key()
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}
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func (i *Iterator) Value() []byte {
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return i.curr.Body()
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}
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func (i *Iterator) Valid() bool {
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return i.valid
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}
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func (i *Iterator) Close() error {
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i.valid = false
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return i.iterator.Close()
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}
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