Move the bits of Prefs where production code has only trivially easy

chrome/browser/prefs/overlay_user_pref_store.cc

-// 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/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);
-}
-
-size_t OverlayUserPrefStore::NumberOfObservers() const {
-  return observers_.size();
-}
-
-bool OverlayUserPrefStore::IsInitializationComplete() const {
-  return underlay_->IsInitializationComplete();
-}
-
-PrefStore::ReadResult OverlayUserPrefStore::GetValue(
-    const std::string& key,
-    const 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 READ_OK;
-  return underlay_->GetValue(GetUnderlayKey(key), result);
-}
-
-PrefStore::ReadResult OverlayUserPrefStore::GetMutableValue(
-    const std::string& key,
-    Value** result) {
-  if (!ShallBeStoredInOverlay(key))
-    return underlay_->GetMutableValue(GetUnderlayKey(key), result);
-
-  if (overlay_.GetValue(key, result))
-    return READ_OK;
-
-  // Try to create copy of underlay if the overlay does not contain a value.
-  Value* underlay_value = NULL;
-  PrefStore::ReadResult read_result =
-      underlay_->GetMutableValue(GetUnderlayKey(key), &underlay_value);
-  if (read_result != READ_OK)
-    return read_result;
-
-  *result = underlay_value->DeepCopy();
-  overlay_.SetValue(key, *result);
-  return READ_OK;
-}
-
-void OverlayUserPrefStore::SetValue(const std::string& key,
-                                      Value* value) {
-  if (!ShallBeStoredInOverlay(key)) {
-    underlay_->SetValue(GetUnderlayKey(key), value);
-    return;
-  }
-
-  if (overlay_.SetValue(key, value))
-    ReportValueChanged(key);
-}
-
-void OverlayUserPrefStore::SetValueSilently(const std::string& key,
-                                              Value* value) {
-  if (!ShallBeStoredInOverlay(key)) {
-    underlay_->SetValueSilently(GetUnderlayKey(key), value);
-    return;
-  }
-
-  overlay_.SetValue(key, value);
-}
-
-void OverlayUserPrefStore::RemoveValue(const std::string& key) {
-  if (!ShallBeStoredInOverlay(key)) {
-    underlay_->RemoveValue(GetUnderlayKey(key));
-    return;
-  }
-
-  if (overlay_.RemoveValue(key))
-    ReportValueChanged(key);
-}
-
-void OverlayUserPrefStore::MarkNeedsEmptyValue(const std::string& key) {
-  if (!ShallBeStoredInOverlay(key))
-    underlay_->MarkNeedsEmptyValue(key);
-}
-
-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::ReportValueChanged(const std::string& key) {
-  FOR_EACH_OBSERVER(PrefStore::Observer, observers_, OnPrefValueChanged(key));
-}
-
-void OverlayUserPrefStore::OnPrefValueChanged(const std::string& key) {
-  if (!overlay_.GetValue(GetOverlayKey(key), NULL))
-    ReportValueChanged(GetOverlayKey(key));
-}
-
-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();
-}