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// Copyright (c) 2010 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 "components/prefs/pref_change_registrar.h"
#include "base/bind.h"
#include "base/logging.h"
#include "components/prefs/pref_service.h"
PrefChangeRegistrar::PrefChangeRegistrar() : service_(NULL) {}
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.
RemoveAll();
}
void PrefChangeRegistrar::Init(PrefService* service) {
DCHECK(IsEmpty() || service_ == service);
service_ = service;
}
void PrefChangeRegistrar::Add(const std::string& path,
const base::Closure& obs) {
Add(path, base::Bind(&PrefChangeRegistrar::InvokeUnnamedCallback, obs));
}
void PrefChangeRegistrar::Add(const std::string& path,
const NamedChangeCallback& obs) {
if (!service_) {
NOTREACHED();
return;
}
DCHECK(!IsObserved(path)) << "Already had pref, \"" << path
<< "\", registered.";
service_->AddPrefObserver(path, this);
observers_[path] = obs;
}
void PrefChangeRegistrar::Remove(const std::string& path) {
DCHECK(IsObserved(path));
observers_.erase(path);
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(const std::string& pref) {
return observers_.find(pref) != observers_.end();
}
bool PrefChangeRegistrar::IsManaged() {
for (ObserverMap::const_iterator it = observers_.begin();
it != observers_.end(); ++it) {
const PrefService::Preference* pref = service_->FindPreference(it->first);
if (pref && pref->IsManaged())
return true;
}
return false;
}
void PrefChangeRegistrar::OnPreferenceChanged(PrefService* service,
const std::string& pref) {
if (IsObserved(pref))
observers_[pref].Run(pref);
}
void PrefChangeRegistrar::InvokeUnnamedCallback(const base::Closure& callback,
const std::string& pref_name) {
callback.Run();
}
PrefService* PrefChangeRegistrar::prefs() {
return service_;
}
const PrefService* PrefChangeRegistrar::prefs() const {
return service_;
}
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