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// 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 "base/prefs/pref_member.h"
#include "base/callback.h"
#include "base/callback_helpers.h"
#include "base/location.h"
#include "base/prefs/pref_service.h"
#include "base/thread_task_runner_handle.h"
#include "base/value_conversions.h"
using base::SingleThreadTaskRunner;
namespace subtle {
PrefMemberBase::PrefMemberBase()
: prefs_(NULL),
setting_value_(false) {
}
PrefMemberBase::~PrefMemberBase() {
Destroy();
}
void PrefMemberBase::Init(const std::string& pref_name,
PrefService* prefs,
const NamedChangeCallback& observer) {
observer_ = observer;
Init(pref_name, prefs);
}
void PrefMemberBase::Init(const std::string& pref_name, PrefService* prefs) {
DCHECK(prefs);
DCHECK(pref_name_.empty()); // Check that Init is only called once.
prefs_ = prefs;
pref_name_ = pref_name;
// Check that the preference is registered.
DCHECK(prefs_->FindPreference(pref_name_)) << 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_, this);
prefs_ = NULL;
}
}
void PrefMemberBase::MoveToThread(
scoped_refptr<SingleThreadTaskRunner> task_runner) {
VerifyValuePrefName();
// Load the value from preferences if it hasn't been loaded so far.
if (!internal())
UpdateValueFromPref(base::Closure());
internal()->MoveToThread(task_runner.Pass());
}
void PrefMemberBase::OnPreferenceChanged(PrefService* service,
const std::string& pref_name) {
VerifyValuePrefName();
UpdateValueFromPref((!setting_value_ && !observer_.is_null()) ?
base::Bind(observer_, pref_name) : base::Closure());
}
void PrefMemberBase::UpdateValueFromPref(const base::Closure& callback) const {
VerifyValuePrefName();
const PrefService::Preference* pref = prefs_->FindPreference(pref_name_);
DCHECK(pref);
if (!internal())
CreateInternal();
internal()->UpdateValue(pref->GetValue()->DeepCopy(),
pref->IsManaged(),
pref->IsUserModifiable(),
callback);
}
void PrefMemberBase::VerifyPref() const {
VerifyValuePrefName();
if (!internal())
UpdateValueFromPref(base::Closure());
}
void PrefMemberBase::InvokeUnnamedCallback(const base::Closure& callback,
const std::string& pref_name) {
callback.Run();
}
PrefMemberBase::Internal::Internal()
: thread_task_runner_(base::ThreadTaskRunnerHandle::Get()),
is_managed_(false),
is_user_modifiable_(false) {
}
PrefMemberBase::Internal::~Internal() { }
bool PrefMemberBase::Internal::IsOnCorrectThread() const {
return thread_task_runner_->BelongsToCurrentThread();
}
void PrefMemberBase::Internal::UpdateValue(
base::Value* v,
bool is_managed,
bool is_user_modifiable,
const base::Closure& callback) const {
scoped_ptr<base::Value> value(v);
base::ScopedClosureRunner closure_runner(callback);
if (IsOnCorrectThread()) {
bool rv = UpdateValueInternal(*value);
DCHECK(rv);
is_managed_ = is_managed;
is_user_modifiable_ = is_user_modifiable;
} else {
bool may_run = thread_task_runner_->PostTask(
FROM_HERE, base::Bind(&PrefMemberBase::Internal::UpdateValue, this,
value.release(), is_managed, is_user_modifiable,
closure_runner.Release()));
DCHECK(may_run);
}
}
void PrefMemberBase::Internal::MoveToThread(
scoped_refptr<SingleThreadTaskRunner> task_runner) {
CheckOnCorrectThread();
thread_task_runner_ = task_runner.Pass();
}
bool PrefMemberVectorStringUpdate(const base::Value& value,
std::vector<std::string>* string_vector) {
if (!value.IsType(base::Value::TYPE_LIST))
return false;
const base::ListValue* list = static_cast<const base::ListValue*>(&value);
std::vector<std::string> local_vector;
for (base::ListValue::const_iterator it = list->begin();
it != list->end(); ++it) {
std::string string_value;
if (!(*it)->GetAsString(&string_value))
return false;
local_vector.push_back(string_value);
}
string_vector->swap(local_vector);
return true;
}
} // namespace subtle
template <>
void PrefMember<bool>::UpdatePref(const bool& value) {
prefs()->SetBoolean(pref_name(), value);
}
template <>
bool PrefMember<bool>::Internal::UpdateValueInternal(
const base::Value& value) const {
return value.GetAsBoolean(&value_);
}
template <>
void PrefMember<int>::UpdatePref(const int& value) {
prefs()->SetInteger(pref_name(), value);
}
template <>
bool PrefMember<int>::Internal::UpdateValueInternal(
const base::Value& value) const {
return value.GetAsInteger(&value_);
}
template <>
void PrefMember<double>::UpdatePref(const double& value) {
prefs()->SetDouble(pref_name(), value);
}
template <>
bool PrefMember<double>::Internal::UpdateValueInternal(const base::Value& value)
const {
return value.GetAsDouble(&value_);
}
template <>
void PrefMember<std::string>::UpdatePref(const std::string& value) {
prefs()->SetString(pref_name(), value);
}
template <>
bool PrefMember<std::string>::Internal::UpdateValueInternal(
const base::Value& value)
const {
return value.GetAsString(&value_);
}
template <>
void PrefMember<base::FilePath>::UpdatePref(const base::FilePath& value) {
prefs()->SetFilePath(pref_name(), value);
}
template <>
bool PrefMember<base::FilePath>::Internal::UpdateValueInternal(
const base::Value& value)
const {
return base::GetValueAsFilePath(value, &value_);
}
template <>
void PrefMember<std::vector<std::string> >::UpdatePref(
const std::vector<std::string>& value) {
base::ListValue list_value;
list_value.AppendStrings(value);
prefs()->Set(pref_name(), list_value);
}
template <>
bool PrefMember<std::vector<std::string> >::Internal::UpdateValueInternal(
const base::Value& value) const {
return subtle::PrefMemberVectorStringUpdate(value, &value_);
}
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