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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/overlay_user_pref_store.h"
#include "base/memory/scoped_ptr.h"
#include "base/values.h"
OverlayUserPrefStore::OverlayUserPrefStore(
PersistentPrefStore* underlay)
: underlay_(underlay) {
underlay_->AddObserver(this);
}
bool OverlayUserPrefStore::IsSetInOverlay(const std::string& key) const {
return overlay_.GetValue(key, NULL);
}
void OverlayUserPrefStore::AddObserver(PrefStore::Observer* observer) {
observers_.AddObserver(observer);
}
void OverlayUserPrefStore::RemoveObserver(PrefStore::Observer* observer) {
observers_.RemoveObserver(observer);
}
bool OverlayUserPrefStore::HasObservers() const {
return observers_.might_have_observers();
}
bool OverlayUserPrefStore::IsInitializationComplete() const {
return underlay_->IsInitializationComplete();
}
bool OverlayUserPrefStore::GetValue(const std::string& key,
const base::Value** result) const {
// If the |key| shall NOT be stored in the overlay store, there must not
// be an entry.
DCHECK(ShallBeStoredInOverlay(key) || !overlay_.GetValue(key, NULL));
if (overlay_.GetValue(key, result))
return true;
return underlay_->GetValue(GetUnderlayKey(key), result);
}
bool OverlayUserPrefStore::GetMutableValue(const std::string& key,
base::Value** result) {
if (!ShallBeStoredInOverlay(key))
return underlay_->GetMutableValue(GetUnderlayKey(key), result);
if (overlay_.GetValue(key, result))
return true;
// Try to create copy of underlay if the overlay does not contain a value.
base::Value* underlay_value = NULL;
if (!underlay_->GetMutableValue(GetUnderlayKey(key), &underlay_value))
return false;
*result = underlay_value->DeepCopy();
overlay_.SetValue(key, *result);
return true;
}
void OverlayUserPrefStore::SetValue(const std::string& key,
base::Value* value,
uint32 flags) {
if (!ShallBeStoredInOverlay(key)) {
underlay_->SetValue(GetUnderlayKey(key), value, flags);
return;
}
if (overlay_.SetValue(key, value))
ReportValueChanged(key, flags);
}
void OverlayUserPrefStore::SetValueSilently(const std::string& key,
base::Value* value,
uint32 flags) {
if (!ShallBeStoredInOverlay(key)) {
underlay_->SetValueSilently(GetUnderlayKey(key), value, flags);
return;
}
overlay_.SetValue(key, value);
}
void OverlayUserPrefStore::RemoveValue(const std::string& key, uint32 flags) {
if (!ShallBeStoredInOverlay(key)) {
underlay_->RemoveValue(GetUnderlayKey(key), flags);
return;
}
if (overlay_.RemoveValue(key))
ReportValueChanged(key, flags);
}
bool OverlayUserPrefStore::ReadOnly() const {
return false;
}
PersistentPrefStore::PrefReadError OverlayUserPrefStore::GetReadError() const {
return PersistentPrefStore::PREF_READ_ERROR_NONE;
}
PersistentPrefStore::PrefReadError OverlayUserPrefStore::ReadPrefs() {
// We do not read intentionally.
OnInitializationCompleted(true);
return PersistentPrefStore::PREF_READ_ERROR_NONE;
}
void OverlayUserPrefStore::ReadPrefsAsync(
ReadErrorDelegate* error_delegate_raw) {
scoped_ptr<ReadErrorDelegate> error_delegate(error_delegate_raw);
// We do not read intentionally.
OnInitializationCompleted(true);
}
void OverlayUserPrefStore::CommitPendingWrite() {
underlay_->CommitPendingWrite();
// We do not write our content intentionally.
}
void OverlayUserPrefStore::SchedulePendingLossyWrites() {
underlay_->SchedulePendingLossyWrites();
}
void OverlayUserPrefStore::ReportValueChanged(const std::string& key,
uint32 flags) {
FOR_EACH_OBSERVER(PrefStore::Observer, observers_, OnPrefValueChanged(key));
}
void OverlayUserPrefStore::OnPrefValueChanged(const std::string& key) {
if (!overlay_.GetValue(GetOverlayKey(key), NULL))
ReportValueChanged(GetOverlayKey(key), DEFAULT_PREF_WRITE_FLAGS);
}
void OverlayUserPrefStore::OnInitializationCompleted(bool succeeded) {
FOR_EACH_OBSERVER(PrefStore::Observer, observers_,
OnInitializationCompleted(succeeded));
}
void OverlayUserPrefStore::RegisterOverlayPref(const std::string& key) {
RegisterOverlayPref(key, key);
}
void OverlayUserPrefStore::RegisterOverlayPref(
const std::string& overlay_key,
const std::string& underlay_key) {
DCHECK(!overlay_key.empty()) << "Overlay key is empty";
DCHECK(overlay_to_underlay_names_map_.find(overlay_key) ==
overlay_to_underlay_names_map_.end()) <<
"Overlay key already registered";
DCHECK(!underlay_key.empty()) << "Underlay key is empty";
DCHECK(underlay_to_overlay_names_map_.find(underlay_key) ==
underlay_to_overlay_names_map_.end()) <<
"Underlay key already registered";
overlay_to_underlay_names_map_[overlay_key] = underlay_key;
underlay_to_overlay_names_map_[underlay_key] = overlay_key;
}
OverlayUserPrefStore::~OverlayUserPrefStore() {
underlay_->RemoveObserver(this);
}
const std::string& OverlayUserPrefStore::GetOverlayKey(
const std::string& underlay_key) const {
NamesMap::const_iterator i =
underlay_to_overlay_names_map_.find(underlay_key);
return i != underlay_to_overlay_names_map_.end() ? i->second : underlay_key;
}
const std::string& OverlayUserPrefStore::GetUnderlayKey(
const std::string& overlay_key) const {
NamesMap::const_iterator i =
overlay_to_underlay_names_map_.find(overlay_key);
return i != overlay_to_underlay_names_map_.end() ? i->second : overlay_key;
}
bool OverlayUserPrefStore::ShallBeStoredInOverlay(
const std::string& key) const {
return overlay_to_underlay_names_map_.find(key) !=
overlay_to_underlay_names_map_.end();
}
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