content/browser/indexed_db/leveldb/leveldb_iterator_impl.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/logging.h"
   6 #include "base/memory/scoped_ptr.h"
   7 #include "content/browser/indexed_db/leveldb/leveldb_iterator_impl.h"
   8
   9 static leveldb::Slice MakeSlice(const base::StringPiece& s) {
  10   return leveldb::Slice(s.begin(), s.size());
  11 }
  12
  13 static base::StringPiece MakeStringPiece(const leveldb::Slice& s) {
  14   return base::StringPiece(s.data(), s.size());
  15 }
  16
  17 namespace content {
  18
  19 LevelDBIteratorImpl::~LevelDBIteratorImpl() {
  20 }
  21
  22 LevelDBIteratorImpl::LevelDBIteratorImpl(scoped_ptr<leveldb::Iterator> it)
  23     : iterator_(it.Pass()) {
  24 }
  25
  26 void LevelDBIteratorImpl::CheckStatus() {
  27   const leveldb::Status& s = iterator_->status();
  28   if (!s.ok())
  29     LOG(ERROR) << "LevelDB iterator error: " << s.ToString();
  30 }
  31
  32 bool LevelDBIteratorImpl::IsValid() const {
  33   return iterator_->Valid();
  34 }
  35
  36 leveldb::Status LevelDBIteratorImpl::SeekToLast() {
  37   iterator_->SeekToLast();
  38   CheckStatus();
  39   return iterator_->status();
  40 }
  41
  42 leveldb::Status LevelDBIteratorImpl::Seek(const base::StringPiece& target) {
  43   iterator_->Seek(MakeSlice(target));
  44   CheckStatus();
  45   return iterator_->status();
  46 }
  47
  48 leveldb::Status LevelDBIteratorImpl::Next() {
  49   DCHECK(IsValid());
  50   iterator_->Next();
  51   CheckStatus();
  52   return iterator_->status();
  53 }
  54
  55 leveldb::Status LevelDBIteratorImpl::Prev() {
  56   DCHECK(IsValid());
  57   iterator_->Prev();
  58   CheckStatus();
  59   return iterator_->status();
  60 }
  61
  62 base::StringPiece LevelDBIteratorImpl::Key() const {
  63   DCHECK(IsValid());
  64   return MakeStringPiece(iterator_->key());
  65 }
  66
  67 base::StringPiece LevelDBIteratorImpl::Value() const {
  68   DCHECK(IsValid());
  69   return MakeStringPiece(iterator_->value());
  70 }
  71
  72 }  // namespace content