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89 lines
2.1 KiB
Go
89 lines
2.1 KiB
Go
// Copyright 2019 The LevelDB-Go and Pebble Authors. All rights reserved. Use
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// of this source code is governed by a BSD-style license that can be found in
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// the LICENSE file.
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package pebble
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import "github.com/cockroachdb/pebble/internal/base"
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// internalIterAdapter adapts the new internalIterator interface which returns
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// the key and value from positioning methods (Seek*, First, Last, Next, Prev)
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// to the old interface which returned a boolean corresponding to Valid. Only
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// used by test code.
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type internalIterAdapter struct {
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internalIterator
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key *InternalKey
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val []byte
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err error
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}
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func newInternalIterAdapter(iter internalIterator) *internalIterAdapter {
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return &internalIterAdapter{
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internalIterator: iter,
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}
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}
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func (i *internalIterAdapter) update(key *InternalKey, val LazyValue) bool {
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i.key = key
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if v, _, err := val.Value(nil); err != nil {
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i.key = nil
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i.val = nil
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i.err = err
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} else {
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i.val = v
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}
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return i.key != nil
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}
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func (i *internalIterAdapter) String() string {
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return "internal-iter-adapter"
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}
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func (i *internalIterAdapter) SeekGE(key []byte, flags base.SeekGEFlags) bool {
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return i.update(i.internalIterator.SeekGE(key, flags))
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}
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func (i *internalIterAdapter) SeekPrefixGE(prefix, key []byte, flags base.SeekGEFlags) bool {
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return i.update(i.internalIterator.SeekPrefixGE(prefix, key, flags))
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}
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func (i *internalIterAdapter) SeekLT(key []byte, flags base.SeekLTFlags) bool {
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return i.update(i.internalIterator.SeekLT(key, flags))
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}
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func (i *internalIterAdapter) First() bool {
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return i.update(i.internalIterator.First())
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}
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func (i *internalIterAdapter) Last() bool {
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return i.update(i.internalIterator.Last())
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}
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func (i *internalIterAdapter) Next() bool {
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return i.update(i.internalIterator.Next())
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}
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func (i *internalIterAdapter) Prev() bool {
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return i.update(i.internalIterator.Prev())
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}
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func (i *internalIterAdapter) Key() *InternalKey {
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return i.key
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}
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func (i *internalIterAdapter) Value() []byte {
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return i.val
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}
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func (i *internalIterAdapter) Valid() bool {
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return i.key != nil
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}
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func (i *internalIterAdapter) Error() error {
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err := i.internalIterator.Error()
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if err != nil {
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return err
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}
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return i.err
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}
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