Componentize //chrome/browser/prefs/tracked.

chrome/browser/prefs/tracked/segregated_pref_store.cc

-// Copyright 2014 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/prefs/tracked/segregated_pref_store.h"
-
-#include "base/logging.h"
-#include "base/stl_util.h"
-#include "base/values.h"
-
-SegregatedPrefStore::AggregatingObserver::AggregatingObserver(
-    SegregatedPrefStore* outer)
-    : outer_(outer),
-      failed_sub_initializations_(0),
-      successful_sub_initializations_(0) {}
-
-void SegregatedPrefStore::AggregatingObserver::OnPrefValueChanged(
-    const std::string& key) {
-  // There is no need to tell clients about changes if they have not yet been
-  // told about initialization.
-  if (failed_sub_initializations_ + successful_sub_initializations_ < 2)
-    return;
-
-  FOR_EACH_OBSERVER(
-      PrefStore::Observer, outer_->observers_, OnPrefValueChanged(key));
-}
-
-void SegregatedPrefStore::AggregatingObserver::OnInitializationCompleted(
-    bool succeeded) {
-  if (succeeded)
-    ++successful_sub_initializations_;
-  else
-    ++failed_sub_initializations_;
-
-  DCHECK_LE(failed_sub_initializations_ + successful_sub_initializations_, 2);
-
-  if (failed_sub_initializations_ + successful_sub_initializations_ == 2) {
-    if (successful_sub_initializations_ == 2 && outer_->read_error_delegate_) {
-      PersistentPrefStore::PrefReadError read_error = outer_->GetReadError();
-      if (read_error != PersistentPrefStore::PREF_READ_ERROR_NONE)
-        outer_->read_error_delegate_->OnError(read_error);
-    }
-
-    FOR_EACH_OBSERVER(
-        PrefStore::Observer,
-        outer_->observers_,
-        OnInitializationCompleted(successful_sub_initializations_ == 2));
-  }
-}
-
-SegregatedPrefStore::SegregatedPrefStore(
-    const scoped_refptr<PersistentPrefStore>& default_pref_store,
-    const scoped_refptr<PersistentPrefStore>& selected_pref_store,
-    const std::set<std::string>& selected_pref_names)
-    : default_pref_store_(default_pref_store),
-      selected_pref_store_(selected_pref_store),
-      selected_preference_names_(selected_pref_names),
-      aggregating_observer_(this) {
-  default_pref_store_->AddObserver(&aggregating_observer_);
-  selected_pref_store_->AddObserver(&aggregating_observer_);
-}
-
-void SegregatedPrefStore::AddObserver(Observer* observer) {
-  observers_.AddObserver(observer);
-}
-
-void SegregatedPrefStore::RemoveObserver(Observer* observer) {
-  observers_.RemoveObserver(observer);
-}
-
-bool SegregatedPrefStore::HasObservers() const {
-  return observers_.might_have_observers();
-}
-
-bool SegregatedPrefStore::IsInitializationComplete() const {
-  return default_pref_store_->IsInitializationComplete() &&
-         selected_pref_store_->IsInitializationComplete();
-}
-
-bool SegregatedPrefStore::GetValue(const std::string& key,
-                                   const base::Value** result) const {
-  return StoreForKey(key)->GetValue(key, result);
-}
-
-void SegregatedPrefStore::SetValue(const std::string& key,
-                                   scoped_ptr<base::Value> value,
-                                   uint32 flags) {
-  StoreForKey(key)->SetValue(key, value.Pass(), flags);
-}
-
-void SegregatedPrefStore::RemoveValue(const std::string& key, uint32 flags) {
-  StoreForKey(key)->RemoveValue(key, flags);
-}
-
-bool SegregatedPrefStore::GetMutableValue(const std::string& key,
-                                          base::Value** result) {
-  return StoreForKey(key)->GetMutableValue(key, result);
-}
-
-void SegregatedPrefStore::ReportValueChanged(const std::string& key,
-                                             uint32 flags) {
-  StoreForKey(key)->ReportValueChanged(key, flags);
-}
-
-void SegregatedPrefStore::SetValueSilently(const std::string& key,
-                                           scoped_ptr<base::Value> value,
-                                           uint32 flags) {
-  StoreForKey(key)->SetValueSilently(key, value.Pass(), flags);
-}
-
-bool SegregatedPrefStore::ReadOnly() const {
-  return selected_pref_store_->ReadOnly() ||
-         default_pref_store_->ReadOnly();
-}
-
-PersistentPrefStore::PrefReadError SegregatedPrefStore::GetReadError() const {
-  PersistentPrefStore::PrefReadError read_error =
-      default_pref_store_->GetReadError();
-  if (read_error == PersistentPrefStore::PREF_READ_ERROR_NONE) {
-    read_error = selected_pref_store_->GetReadError();
-    // Ignore NO_FILE from selected_pref_store_.
-    if (read_error == PersistentPrefStore::PREF_READ_ERROR_NO_FILE)
-      read_error = PersistentPrefStore::PREF_READ_ERROR_NONE;
-  }
-  return read_error;
-}
-
-PersistentPrefStore::PrefReadError SegregatedPrefStore::ReadPrefs() {
-  // Note: Both of these stores own PrefFilters which makes ReadPrefs
-  // asynchronous. This is okay in this case as only the first call will be
-  // truly asynchronous, the second call will then unblock the migration in
-  // TrackedPreferencesMigrator and complete synchronously.
-  default_pref_store_->ReadPrefs();
-  PersistentPrefStore::PrefReadError selected_store_read_error =
-      selected_pref_store_->ReadPrefs();
-  DCHECK_NE(PersistentPrefStore::PREF_READ_ERROR_ASYNCHRONOUS_TASK_INCOMPLETE,
-            selected_store_read_error);
-
-  return GetReadError();
-}
-
-void SegregatedPrefStore::ReadPrefsAsync(ReadErrorDelegate* error_delegate) {
-  read_error_delegate_.reset(error_delegate);
-  default_pref_store_->ReadPrefsAsync(NULL);
-  selected_pref_store_->ReadPrefsAsync(NULL);
-}
-
-void SegregatedPrefStore::CommitPendingWrite() {
-  default_pref_store_->CommitPendingWrite();
-  selected_pref_store_->CommitPendingWrite();
-}
-
-void SegregatedPrefStore::SchedulePendingLossyWrites() {
-  default_pref_store_->SchedulePendingLossyWrites();
-  selected_pref_store_->SchedulePendingLossyWrites();
-}
-
-SegregatedPrefStore::~SegregatedPrefStore() {
-  default_pref_store_->RemoveObserver(&aggregating_observer_);
-  selected_pref_store_->RemoveObserver(&aggregating_observer_);
-}
-
-PersistentPrefStore* SegregatedPrefStore::StoreForKey(const std::string& key) {
-  return (ContainsKey(selected_preference_names_, key)
-              ? selected_pref_store_
-              : default_pref_store_).get();
-}
-
-const PersistentPrefStore* SegregatedPrefStore::StoreForKey(
-    const std::string& key) const {
-  return (ContainsKey(selected_preference_names_, key)
-              ? selected_pref_store_
-              : default_pref_store_).get();
-}