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86 lines
1.7 KiB
86 lines
1.7 KiB
// Copyright (c) 2014 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package boltdb
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import (
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"bytes"
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bolt "go.etcd.io/bbolt"
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)
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type Iterator struct {
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store *Store
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tx *bolt.Tx
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cursor *bolt.Cursor
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prefix []byte
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start []byte
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end []byte
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valid bool
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key []byte
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val []byte
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}
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func (i *Iterator) updateValid() {
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i.valid = (i.key != nil)
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if i.valid {
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if i.prefix != nil {
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i.valid = bytes.HasPrefix(i.key, i.prefix)
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} else if i.end != nil {
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i.valid = bytes.Compare(i.key, i.end) < 0
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}
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}
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}
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func (i *Iterator) Seek(k []byte) {
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if i.start != nil && bytes.Compare(k, i.start) < 0 {
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k = i.start
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}
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if i.prefix != nil && !bytes.HasPrefix(k, i.prefix) {
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if bytes.Compare(k, i.prefix) < 0 {
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k = i.prefix
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} else {
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i.valid = false
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return
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}
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}
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i.key, i.val = i.cursor.Seek(k)
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i.updateValid()
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}
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func (i *Iterator) Next() {
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i.key, i.val = i.cursor.Next()
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i.updateValid()
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}
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func (i *Iterator) Current() ([]byte, []byte, bool) {
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return i.key, i.val, i.valid
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}
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func (i *Iterator) Key() []byte {
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return i.key
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}
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func (i *Iterator) Value() []byte {
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return i.val
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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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return nil
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}
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