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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 "chrome/browser/api/prefs/pref_member.h"
#include "base/bind.h"
#include "base/value_conversions.h"
#include "chrome/browser/api/prefs/pref_service_base.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,
PrefServiceBase* 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 PrefServiceBase::Preference* pref =
prefs_->FindPreference(pref_name_.c_str());
DCHECK(pref);
if (!internal())
CreateInternal();
internal()->UpdateValue(pref->GetValue()->DeepCopy(),
pref->IsManaged(),
pref->IsUserModifiable());
}
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,
bool is_user_modifiable) const {
scoped_ptr<Value> value(v);
if (IsOnCorrectThread()) {
bool rv = UpdateValueInternal(*value);
DCHECK(rv);
is_managed_ = is_managed;
is_user_modifiable_ = is_user_modifiable;
} else {
bool rv = BrowserThread::PostTask(
thread_id_, FROM_HERE,
base::Bind(&PrefMemberBase::Internal::UpdateValue, this,
value.release(), is_managed, is_user_modifiable));
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_);
}
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