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// Copyright 2014 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/tracked/segregated_pref_store.h"
#include "base/logging.h"
#include "base/stl_util.h"
#include "base/values.h"
SegregatedPrefStore::AggregatingObserver::AggregatingObserver(
SegregatedPrefStore* outer)
: outer_(outer),
failed_sub_initializations_(0),
successful_sub_initializations_(0) {}
void SegregatedPrefStore::AggregatingObserver::OnPrefValueChanged(
const std::string& key) {
// There is no need to tell clients about changes if they have not yet been
// told about initialization.
if (failed_sub_initializations_ + successful_sub_initializations_ < 2)
return;
FOR_EACH_OBSERVER(
PrefStore::Observer, outer_->observers_, OnPrefValueChanged(key));
}
void SegregatedPrefStore::AggregatingObserver::OnInitializationCompleted(
bool succeeded) {
if (succeeded)
++successful_sub_initializations_;
else
++failed_sub_initializations_;
DCHECK_LE(failed_sub_initializations_ + successful_sub_initializations_, 2);
if (failed_sub_initializations_ + successful_sub_initializations_ == 2) {
if (!outer_->on_initialization_.is_null())
outer_->on_initialization_.Run();
if (successful_sub_initializations_ == 2 && outer_->read_error_delegate_) {
PersistentPrefStore::PrefReadError read_error = outer_->GetReadError();
if (read_error != PersistentPrefStore::PREF_READ_ERROR_NONE)
outer_->read_error_delegate_->OnError(read_error);
}
FOR_EACH_OBSERVER(
PrefStore::Observer,
outer_->observers_,
OnInitializationCompleted(successful_sub_initializations_ == 2));
}
}
SegregatedPrefStore::SegregatedPrefStore(
const scoped_refptr<PersistentPrefStore>& default_pref_store,
const scoped_refptr<PersistentPrefStore>& selected_pref_store,
const std::set<std::string>& selected_pref_names,
const base::Closure& on_initialization)
: default_pref_store_(default_pref_store),
selected_pref_store_(selected_pref_store),
selected_preference_names_(selected_pref_names),
on_initialization_(on_initialization),
aggregating_observer_(this) {
default_pref_store_->AddObserver(&aggregating_observer_);
selected_pref_store_->AddObserver(&aggregating_observer_);
}
void SegregatedPrefStore::AddObserver(Observer* observer) {
observers_.AddObserver(observer);
}
void SegregatedPrefStore::RemoveObserver(Observer* observer) {
observers_.RemoveObserver(observer);
}
bool SegregatedPrefStore::HasObservers() const {
return observers_.might_have_observers();
}
bool SegregatedPrefStore::IsInitializationComplete() const {
return default_pref_store_->IsInitializationComplete() &&
selected_pref_store_->IsInitializationComplete();
}
bool SegregatedPrefStore::GetValue(const std::string& key,
const base::Value** result) const {
return StoreForKey(key)->GetValue(key, result);
}
void SegregatedPrefStore::SetValue(const std::string& key, base::Value* value) {
StoreForKey(key)->SetValue(key, value);
}
void SegregatedPrefStore::RemoveValue(const std::string& key) {
StoreForKey(key)->RemoveValue(key);
}
bool SegregatedPrefStore::GetMutableValue(const std::string& key,
base::Value** result) {
return StoreForKey(key)->GetMutableValue(key, result);
}
void SegregatedPrefStore::ReportValueChanged(const std::string& key) {
StoreForKey(key)->ReportValueChanged(key);
}
void SegregatedPrefStore::SetValueSilently(const std::string& key,
base::Value* value) {
StoreForKey(key)->SetValueSilently(key, value);
}
bool SegregatedPrefStore::ReadOnly() const {
return selected_pref_store_->ReadOnly() ||
default_pref_store_->ReadOnly();
}
PersistentPrefStore::PrefReadError SegregatedPrefStore::GetReadError() const {
PersistentPrefStore::PrefReadError read_error =
default_pref_store_->GetReadError();
return read_error != PersistentPrefStore::PREF_READ_ERROR_NONE
? read_error
: selected_pref_store_->GetReadError();
}
PersistentPrefStore::PrefReadError SegregatedPrefStore::ReadPrefs() {
PersistentPrefStore::PrefReadError unselected_read_error =
default_pref_store_->ReadPrefs();
PersistentPrefStore::PrefReadError selected_read_error =
selected_pref_store_->ReadPrefs();
return unselected_read_error != PersistentPrefStore::PREF_READ_ERROR_NONE
? unselected_read_error
: selected_read_error;
}
void SegregatedPrefStore::ReadPrefsAsync(ReadErrorDelegate* error_delegate) {
read_error_delegate_.reset(error_delegate);
default_pref_store_->ReadPrefsAsync(NULL);
selected_pref_store_->ReadPrefsAsync(NULL);
}
void SegregatedPrefStore::CommitPendingWrite() {
default_pref_store_->CommitPendingWrite();
selected_pref_store_->CommitPendingWrite();
}
SegregatedPrefStore::~SegregatedPrefStore() {
default_pref_store_->RemoveObserver(&aggregating_observer_);
selected_pref_store_->RemoveObserver(&aggregating_observer_);
}
const PersistentPrefStore*
SegregatedPrefStore::StoreForKey(const std::string& key) const {
if (ContainsKey(selected_preference_names_, key) ||
selected_pref_store_->GetValue(key, NULL)) {
return selected_pref_store_.get();
}
return default_pref_store_.get();
}
PersistentPrefStore* SegregatedPrefStore::StoreForKey(const std::string& key) {
if (ContainsKey(selected_preference_names_, key))
return selected_pref_store_.get();
// Check if this unselected value was previously selected. If so, migrate it
// back to the unselected store.
// It's hard to do this in a single pass at startup because PrefStore does not
// permit us to enumerate its contents.
const base::Value* value = NULL;
if (selected_pref_store_->GetValue(key, &value)) {
scoped_ptr<base::Value> migrated_value(value->DeepCopy());
value = NULL;
default_pref_store_->SetValue(key, migrated_value.release());
default_pref_store_->CommitPendingWrite();
selected_pref_store_->RemoveValue(key);
selected_pref_store_->CommitPendingWrite();
}
return default_pref_store_.get();
}
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