Move PrefMember and PrefChangeRegistrar to api directory.

chrome/browser/prefs/pref_member.cc

-// Copyright (c) 2012 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/pref_member.h"
-
-#include "base/bind.h"
-#include "base/logging.h"
-#include "base/value_conversions.h"
-#include "chrome/browser/prefs/pref_service.h"
-#include "chrome/common/chrome_notification_types.h"
-
-using content::BrowserThread;
-
-namespace subtle {
-
-PrefMemberBase::PrefMemberBase()
-    : observer_(NULL),
-      prefs_(NULL),
-      setting_value_(false) {
-}
-
-PrefMemberBase::~PrefMemberBase() {
-  Destroy();
-}
-
-
-void PrefMemberBase::Init(const char* pref_name,
-                          PrefService* prefs,
-                          content::NotificationObserver* observer) {
-  DCHECK(pref_name);
-  DCHECK(prefs);
-  DCHECK(pref_name_.empty());  // Check that Init is only called once.
-  observer_ = observer;
-  prefs_ = prefs;
-  pref_name_ = pref_name;
-  // Check that the preference is registered.
-  DCHECK(prefs_->FindPreference(pref_name_.c_str()))
-      << pref_name << " not registered.";
-
-  // Add ourselves as a pref observer so we can keep our local value in sync.
-  prefs_->AddPrefObserver(pref_name, this);
-}
-
-void PrefMemberBase::Destroy() {
-  if (prefs_ && !pref_name_.empty()) {
-    prefs_->RemovePrefObserver(pref_name_.c_str(), this);
-    prefs_ = NULL;
-  }
-}
-
-void PrefMemberBase::MoveToThread(BrowserThread::ID thread_id) {
-  VerifyValuePrefName();
-  // Load the value from preferences if it hasn't been loaded so far.
-  if (!internal())
-    UpdateValueFromPref();
-  internal()->MoveToThread(thread_id);
-}
-
-void PrefMemberBase::Observe(int type,
-                             const content::NotificationSource& source,
-                             const content::NotificationDetails& details) {
-  VerifyValuePrefName();
-  DCHECK(chrome::NOTIFICATION_PREF_CHANGED == type);
-  UpdateValueFromPref();
-  if (!setting_value_ && observer_)
-    observer_->Observe(type, source, details);
-}
-
-void PrefMemberBase::UpdateValueFromPref() const {
-  VerifyValuePrefName();
-  const PrefService::Preference* pref =
-      prefs_->FindPreference(pref_name_.c_str());
-  DCHECK(pref);
-  if (!internal())
-    CreateInternal();
-  internal()->UpdateValue(pref->GetValue()->DeepCopy(), pref->IsManaged());
-}
-
-void PrefMemberBase::VerifyPref() const {
-  VerifyValuePrefName();
-  if (!internal())
-    UpdateValueFromPref();
-}
-
-PrefMemberBase::Internal::Internal()
-    : thread_id_(BrowserThread::UI),
-      is_managed_(false) {
-}
-PrefMemberBase::Internal::~Internal() { }
-
-bool PrefMemberBase::Internal::IsOnCorrectThread() const {
-  // In unit tests, there may not be a UI thread.
-  return (BrowserThread::CurrentlyOn(thread_id_) ||
-          (thread_id_ == BrowserThread::UI &&
-           !BrowserThread::IsMessageLoopValid(BrowserThread::UI)));
-}
-
-void PrefMemberBase::Internal::UpdateValue(Value* v, bool is_managed) const {
-  scoped_ptr<Value> value(v);
-  if (IsOnCorrectThread()) {
-    bool rv = UpdateValueInternal(*value);
-    DCHECK(rv);
-    is_managed_ = is_managed;
-  } else {
-    bool rv = BrowserThread::PostTask(
-        thread_id_, FROM_HERE,
-        base::Bind(&PrefMemberBase::Internal::UpdateValue, this,
-                   value.release(), is_managed));
-    DCHECK(rv);
-  }
-}
-
-void PrefMemberBase::Internal::MoveToThread(BrowserThread::ID thread_id) {
-  CheckOnCorrectThread();
-  thread_id_ = thread_id;
-}
-
-}  // namespace subtle
-
-template <>
-void PrefMember<bool>::UpdatePref(const bool& value) {
-  prefs()->SetBoolean(pref_name().c_str(), value);
-}
-
-template <>
-bool PrefMember<bool>::Internal::UpdateValueInternal(const Value& value) const {
-  return value.GetAsBoolean(&value_);
-}
-
-template <>
-void PrefMember<int>::UpdatePref(const int& value) {
-  prefs()->SetInteger(pref_name().c_str(), value);
-}
-
-template <>
-bool PrefMember<int>::Internal::UpdateValueInternal(const Value& value) const {
-  return value.GetAsInteger(&value_);
-}
-
-template <>
-void PrefMember<double>::UpdatePref(const double& value) {
-  prefs()->SetDouble(pref_name().c_str(), value);
-}
-
-template <>
-bool PrefMember<double>::Internal::UpdateValueInternal(const Value& value)
-    const {
-  return value.GetAsDouble(&value_);
-}
-
-template <>
-void PrefMember<std::string>::UpdatePref(const std::string& value) {
-  prefs()->SetString(pref_name().c_str(), value);
-}
-
-template <>
-bool PrefMember<std::string>::Internal::UpdateValueInternal(const Value& value)
-    const {
-  return value.GetAsString(&value_);
-}
-
-template <>
-void PrefMember<FilePath>::UpdatePref(const FilePath& value) {
-  prefs()->SetFilePath(pref_name().c_str(), value);
-}
-
-template <>
-bool PrefMember<FilePath>::Internal::UpdateValueInternal(const Value& value)
-    const {
-  return base::GetValueAsFilePath(value, &value_);
-}