Extension Settings API: make it so that when changes received from Sync fail to

chrome/browser/extensions/settings/in_memory_settings_storage.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/extensions/settings/in_memory_settings_storage.h"
-
-#include "base/logging.h"
-
-namespace extensions {
-
-namespace {
-
-std::vector<std::string> CreateVector(const std::string& string) {
-  std::vector<std::string> strings;
-  strings.push_back(string);
-  return strings;
-}
-
-}  // namespace
-
-SettingsStorage::ReadResult InMemorySettingsStorage::Get(
-    const std::string& key) {
-  return Get(CreateVector(key));
-}
-
-SettingsStorage::ReadResult InMemorySettingsStorage::Get(
-    const std::vector<std::string>& keys) {
-  DictionaryValue* settings = new DictionaryValue();
-  for (std::vector<std::string>::const_iterator it = keys.begin();
-      it != keys.end(); ++it) {
-    Value* value = NULL;
-    if (storage_.GetWithoutPathExpansion(*it, &value)) {
-      settings->SetWithoutPathExpansion(*it, value->DeepCopy());
-    }
-  }
-  return ReadResult(settings);
-}
-
-SettingsStorage::ReadResult InMemorySettingsStorage::Get() {
-  return ReadResult(storage_.DeepCopy());
-}
-
-SettingsStorage::WriteResult InMemorySettingsStorage::Set(
-    const std::string& key, const Value& value) {
-  DictionaryValue settings;
-  settings.SetWithoutPathExpansion(key, value.DeepCopy());
-  return Set(settings);
-}
-
-SettingsStorage::WriteResult InMemorySettingsStorage::Set(
-    const DictionaryValue& settings) {
-  scoped_ptr<SettingChangeList> changes(
-      new SettingChangeList());
-  for (DictionaryValue::Iterator it(settings); it.HasNext(); it.Advance()) {
-    Value* old_value = NULL;
-    storage_.GetWithoutPathExpansion(it.key(), &old_value);
-    if (!old_value || !old_value->Equals(&it.value())) {
-      changes->push_back(
-          SettingChange(
-              it.key(),
-              old_value ? old_value->DeepCopy() : old_value,
-              it.value().DeepCopy()));
-      storage_.SetWithoutPathExpansion(it.key(), it.value().DeepCopy());
-    }
-  }
-  return WriteResult(changes.release());
-}
-
-SettingsStorage::WriteResult InMemorySettingsStorage::Remove(
-    const std::string& key) {
-  return Remove(CreateVector(key));
-}
-
-SettingsStorage::WriteResult InMemorySettingsStorage::Remove(
-    const std::vector<std::string>& keys) {
-  scoped_ptr<SettingChangeList> changes(
-      new SettingChangeList());
-  for (std::vector<std::string>::const_iterator it = keys.begin();
-      it != keys.end(); ++it) {
-    Value* old_value = NULL;
-    if (storage_.RemoveWithoutPathExpansion(*it, &old_value)) {
-      changes->push_back(SettingChange(*it, old_value, NULL));
-    }
-  }
-  return WriteResult(changes.release());
-}
-
-SettingsStorage::WriteResult
-InMemorySettingsStorage::Clear() {
-  std::vector<std::string> keys;
-  for (DictionaryValue::Iterator it(storage_); it.HasNext(); it.Advance()) {
-    keys.push_back(it.key());
-  }
-  return Remove(keys);
-}
-
-}  // namespace extensions