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// Copyright 2010 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/prefs/pref_change_registrar.h"
#include <ostream>
#include "base/check.h"
#include "base/functional/bind.h"
#include "base/notreached.h"
#include "components/prefs/pref_service.h"
PrefChangeRegistrar::PrefChangeRegistrar() : service_(nullptr) {}
PrefChangeRegistrar::~PrefChangeRegistrar() {
// If you see an invalid memory access in this destructor, this
// PrefChangeRegistrar might be subscribed to an OffTheRecordProfileImpl that
// has been destroyed. This should not happen any more but be warned.
// Feel free to contact battre@chromium.org in case this happens.
//
// This can also happen for non-OTR profiles, when the
// DestroyProfileOnBrowserClose flag is enabled. In that case, contact
// nicolaso@chromium.org.
RemoveAll();
}
void PrefChangeRegistrar::Init(PrefService* service) {
DCHECK(IsEmpty() || service_ == service);
service_ = service;
}
void PrefChangeRegistrar::Reset() {
RemoveAll();
service_ = nullptr;
}
void PrefChangeRegistrar::Add(std::string_view path,
const base::RepeatingClosure& obs) {
Add(path,
base::BindRepeating(&PrefChangeRegistrar::InvokeUnnamedCallback, obs));
}
void PrefChangeRegistrar::Add(std::string_view path,
const NamedChangeCallback& obs) {
if (!service_) {
NOTREACHED();
}
DCHECK(!IsObserved(path)) << "Already had pref, \"" << path
<< "\", registered.";
service_->AddPrefObserver(path, this);
observers_.insert_or_assign(std::string(path), obs);
}
void PrefChangeRegistrar::Remove(std::string_view path) {
DCHECK(IsObserved(path));
// Use std::map::erase directly once C++23 is supported.
auto it = observers_.find(path);
observers_.erase(it);
service_->RemovePrefObserver(path, this);
}
void PrefChangeRegistrar::RemoveAll() {
for (ObserverMap::const_iterator it = observers_.begin();
it != observers_.end(); ++it) {
service_->RemovePrefObserver(it->first, this);
}
observers_.clear();
}
bool PrefChangeRegistrar::IsEmpty() const {
return observers_.empty();
}
bool PrefChangeRegistrar::IsObserved(std::string_view pref) {
return observers_.find(pref) != observers_.end();
}
void PrefChangeRegistrar::OnPreferenceChanged(PrefService* service,
std::string_view pref) {
if (auto it = observers_.find(pref); it != observers_.end()) {
// TODO: crbug.com/349741884 - Consider changing the callback to accept a
// string_view.
it->second.Run(std::string(pref));
}
}
void PrefChangeRegistrar::InvokeUnnamedCallback(
const base::RepeatingClosure& callback,
const std::string& pref_name) {
callback.Run();
}
PrefService* PrefChangeRegistrar::prefs() {
return service_;
}
const PrefService* PrefChangeRegistrar::prefs() const {
return service_;
}
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