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// 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/extension_settings_storage_cache.h"
ExtensionSettingsStorageCache::ExtensionSettingsStorageCache(
ExtensionSettingsStorage* delegate) : delegate_(delegate) {}
ExtensionSettingsStorageCache::~ExtensionSettingsStorageCache() {}
ExtensionSettingsStorage::ReadResult ExtensionSettingsStorageCache::Get(
const std::string& key) {
Value *value;
if (GetFromCache(key, &value)) {
DictionaryValue* settings = new DictionaryValue();
settings->SetWithoutPathExpansion(key, value);
return ReadResult(settings);
}
ReadResult result = delegate_->Get(key);
if (result.HasError()) {
return result;
}
cache_.MergeDictionary(&result.settings());
return result;
}
ExtensionSettingsStorage::ReadResult ExtensionSettingsStorageCache::Get(
const std::vector<std::string>& keys) {
scoped_ptr<DictionaryValue> from_cache(new DictionaryValue());
std::vector<std::string> missing_keys;
for (std::vector<std::string>::const_iterator it = keys.begin();
it != keys.end(); ++it) {
Value *value;
if (GetFromCache(*it, &value)) {
from_cache->SetWithoutPathExpansion(*it, value);
} else {
missing_keys.push_back(*it);
}
}
if (missing_keys.empty()) {
return ReadResult(from_cache.release());
}
ReadResult result = delegate_->Get(missing_keys);
if (result.HasError()) {
return result;
}
cache_.MergeDictionary(&result.settings());
from_cache->MergeDictionary(&result.settings());
return ReadResult(from_cache.release());
}
ExtensionSettingsStorage::ReadResult ExtensionSettingsStorageCache::Get() {
ReadResult result = delegate_->Get();
if (!result.HasError()) {
cache_.MergeDictionary(&result.settings());
}
return result;
}
ExtensionSettingsStorage::WriteResult ExtensionSettingsStorageCache::Set(
const std::string& key, const Value& value) {
WriteResult result = delegate_->Set(key, value);
if (!result.HasError()) {
cache_.SetWithoutPathExpansion(key, value.DeepCopy());
}
return result;
}
ExtensionSettingsStorage::WriteResult ExtensionSettingsStorageCache::Set(
const DictionaryValue& settings) {
WriteResult result = delegate_->Set(settings);
if (result.HasError()) {
return result;
}
for (ExtensionSettingChangeList::const_iterator it = result.changes().begin();
it != result.changes().end(); ++it) {
DCHECK(it->new_value());
cache_.SetWithoutPathExpansion(it->key(), it->new_value()->DeepCopy());
}
return result;
}
ExtensionSettingsStorage::WriteResult ExtensionSettingsStorageCache::Remove(
const std::string& key) {
WriteResult result = delegate_->Remove(key);
if (!result.HasError()) {
cache_.RemoveWithoutPathExpansion(key, NULL);
}
return result;
}
ExtensionSettingsStorage::WriteResult ExtensionSettingsStorageCache::Remove(
const std::vector<std::string>& keys) {
WriteResult result = delegate_->Remove(keys);
if (result.HasError()) {
return result;
}
for (ExtensionSettingChangeList::const_iterator it = result.changes().begin();
it != result.changes().end(); ++it) {
cache_.RemoveWithoutPathExpansion(it->key(), NULL);
}
return result;
}
ExtensionSettingsStorage::WriteResult ExtensionSettingsStorageCache::Clear() {
WriteResult result = delegate_->Clear();
if (!result.HasError()) {
cache_.Clear();
}
return result;
}
bool ExtensionSettingsStorageCache::GetFromCache(
const std::string& key, Value** value) {
Value* cached_value;
if (!cache_.GetWithoutPathExpansion(key, &cached_value)) {
return false;
}
*value = cached_value->DeepCopy();
return true;
}
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