Revert of Move base/prefs to components/prefs

components/prefs/pref_service.cc

Index: components/prefs/pref_service.cc
diff --git a/components/prefs/pref_service.cc b/components/prefs/pref_service.cc
deleted file mode 100644
index 077bb1d25ff5aadd161eb9c834ad56cdf3a52676..0000000000000000000000000000000000000000
--- a/components/prefs/pref_service.cc
+++ /dev/null
@@ -1,616 +0,0 @@
-// 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/pref_service.h"
-
-#include <algorithm>
-#include <utility>
-
-#include "base/bind.h"
-#include "base/files/file_path.h"
-#include "base/location.h"
-#include "base/logging.h"
-#include "base/metrics/histogram.h"
-#include "base/prefs/default_pref_store.h"
-#include "base/prefs/pref_notifier_impl.h"
-#include "base/prefs/pref_registry.h"
-#include "base/prefs/pref_value_store.h"
-#include "base/single_thread_task_runner.h"
-#include "base/stl_util.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_util.h"
-#include "base/thread_task_runner_handle.h"
-#include "base/value_conversions.h"
-#include "build/build_config.h"
-
-namespace {
-
-class ReadErrorHandler : public PersistentPrefStore::ReadErrorDelegate {
- public:
-  ReadErrorHandler(base::Callback<void(PersistentPrefStore::PrefReadError)> cb)
-      : callback_(cb) {}
-
-  void OnError(PersistentPrefStore::PrefReadError error) override {
-    callback_.Run(error);
-  }
-
- private:
-  base::Callback<void(PersistentPrefStore::PrefReadError)> callback_;
-};
-
-// Returns the WriteablePrefStore::PrefWriteFlags for the pref with the given
-// |path|.
-uint32_t GetWriteFlags(const PrefService::Preference* pref) {
-  uint32_t write_flags = WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS;
-
-  if (!pref)
-    return write_flags;
-
-  if (pref->registration_flags() & PrefRegistry::LOSSY_PREF)
-    write_flags |= WriteablePrefStore::LOSSY_PREF_WRITE_FLAG;
-  return write_flags;
-}
-
-}  // namespace
-
-PrefService::PrefService(
-    PrefNotifierImpl* pref_notifier,
-    PrefValueStore* pref_value_store,
-    PersistentPrefStore* user_prefs,
-    PrefRegistry* pref_registry,
-    base::Callback<void(PersistentPrefStore::PrefReadError)>
-        read_error_callback,
-    bool async)
-    : pref_notifier_(pref_notifier),
-      pref_value_store_(pref_value_store),
-      pref_registry_(pref_registry),
-      user_pref_store_(user_prefs),
-      read_error_callback_(read_error_callback) {
-  pref_notifier_->SetPrefService(this);
-
-  // TODO(battre): This is a check for crbug.com/435208 to make sure that
-  // access violations are caused by a use-after-free bug and not by an
-  // initialization bug.
-  CHECK(pref_registry_);
-  CHECK(pref_value_store_);
-
-  InitFromStorage(async);
-}
-
-PrefService::~PrefService() {
-  DCHECK(CalledOnValidThread());
-
-  // Reset pointers so accesses after destruction reliably crash.
-  pref_value_store_.reset();
-  pref_registry_ = NULL;
-  user_pref_store_ = NULL;
-  pref_notifier_.reset();
-}
-
-void PrefService::InitFromStorage(bool async) {
-  if (user_pref_store_->IsInitializationComplete()) {
-    read_error_callback_.Run(user_pref_store_->GetReadError());
-  } else if (!async) {
-    read_error_callback_.Run(user_pref_store_->ReadPrefs());
-  } else {
-    // Guarantee that initialization happens after this function returned.
-    base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE,
-        base::Bind(&PersistentPrefStore::ReadPrefsAsync, user_pref_store_.get(),
-                   new ReadErrorHandler(read_error_callback_)));
-  }
-}
-
-void PrefService::CommitPendingWrite() {
-  DCHECK(CalledOnValidThread());
-  user_pref_store_->CommitPendingWrite();
-}
-
-void PrefService::SchedulePendingLossyWrites() {
-  DCHECK(CalledOnValidThread());
-  user_pref_store_->SchedulePendingLossyWrites();
-}
-
-bool PrefService::GetBoolean(const std::string& path) const {
-  DCHECK(CalledOnValidThread());
-
-  bool result = false;
-
-  const base::Value* value = GetPreferenceValue(path);
-  if (!value) {
-    NOTREACHED() << "Trying to read an unregistered pref: " << path;
-    return result;
-  }
-  bool rv = value->GetAsBoolean(&result);
-  DCHECK(rv);
-  return result;
-}
-
-int PrefService::GetInteger(const std::string& path) const {
-  DCHECK(CalledOnValidThread());
-
-  int result = 0;
-
-  const base::Value* value = GetPreferenceValue(path);
-  if (!value) {
-    NOTREACHED() << "Trying to read an unregistered pref: " << path;
-    return result;
-  }
-  bool rv = value->GetAsInteger(&result);
-  DCHECK(rv);
-  return result;
-}
-
-double PrefService::GetDouble(const std::string& path) const {
-  DCHECK(CalledOnValidThread());
-
-  double result = 0.0;
-
-  const base::Value* value = GetPreferenceValue(path);
-  if (!value) {
-    NOTREACHED() << "Trying to read an unregistered pref: " << path;
-    return result;
-  }
-  bool rv = value->GetAsDouble(&result);
-  DCHECK(rv);
-  return result;
-}
-
-std::string PrefService::GetString(const std::string& path) const {
-  DCHECK(CalledOnValidThread());
-
-  std::string result;
-
-  const base::Value* value = GetPreferenceValue(path);
-  if (!value) {
-    NOTREACHED() << "Trying to read an unregistered pref: " << path;
-    return result;
-  }
-  bool rv = value->GetAsString(&result);
-  DCHECK(rv);
-  return result;
-}
-
-base::FilePath PrefService::GetFilePath(const std::string& path) const {
-  DCHECK(CalledOnValidThread());
-
-  base::FilePath result;
-
-  const base::Value* value = GetPreferenceValue(path);
-  if (!value) {
-    NOTREACHED() << "Trying to read an unregistered pref: " << path;
-    return base::FilePath(result);
-  }
-  bool rv = base::GetValueAsFilePath(*value, &result);
-  DCHECK(rv);
-  return result;
-}
-
-bool PrefService::HasPrefPath(const std::string& path) const {
-  const Preference* pref = FindPreference(path);
-  return pref && !pref->IsDefaultValue();
-}
-
-scoped_ptr<base::DictionaryValue> PrefService::GetPreferenceValues() const {
-  DCHECK(CalledOnValidThread());
-  scoped_ptr<base::DictionaryValue> out(new base::DictionaryValue);
-  for (const auto& it : *pref_registry_) {
-    out->Set(it.first, GetPreferenceValue(it.first)->CreateDeepCopy());
-  }
-  return out;
-}
-
-scoped_ptr<base::DictionaryValue> PrefService::GetPreferenceValuesOmitDefaults()
-    const {
-  DCHECK(CalledOnValidThread());
-  scoped_ptr<base::DictionaryValue> out(new base::DictionaryValue);
-  for (const auto& it : *pref_registry_) {
-    const Preference* pref = FindPreference(it.first);
-    if (pref->IsDefaultValue())
-      continue;
-    out->Set(it.first, pref->GetValue()->CreateDeepCopy());
-  }
-  return out;
-}
-
-scoped_ptr<base::DictionaryValue>
-PrefService::GetPreferenceValuesWithoutPathExpansion() const {
-  DCHECK(CalledOnValidThread());
-  scoped_ptr<base::DictionaryValue> out(new base::DictionaryValue);
-  for (const auto& it : *pref_registry_) {
-    const base::Value* value = GetPreferenceValue(it.first);
-    DCHECK(value);
-    out->SetWithoutPathExpansion(it.first, value->CreateDeepCopy());
-  }
-  return out;
-}
-
-const PrefService::Preference* PrefService::FindPreference(
-    const std::string& pref_name) const {
-  DCHECK(CalledOnValidThread());
-  PreferenceMap::iterator it = prefs_map_.find(pref_name);
-  if (it != prefs_map_.end())
-    return &(it->second);
-  const base::Value* default_value = NULL;
-  if (!pref_registry_->defaults()->GetValue(pref_name, &default_value))
-    return NULL;
-  it = prefs_map_.insert(
-      std::make_pair(pref_name, Preference(
-          this, pref_name, default_value->GetType()))).first;
-  return &(it->second);
-}
-
-bool PrefService::ReadOnly() const {
-  return user_pref_store_->ReadOnly();
-}
-
-PrefService::PrefInitializationStatus PrefService::GetInitializationStatus()
-    const {
-  if (!user_pref_store_->IsInitializationComplete())
-    return INITIALIZATION_STATUS_WAITING;
-
-  switch (user_pref_store_->GetReadError()) {
-    case PersistentPrefStore::PREF_READ_ERROR_NONE:
-      return INITIALIZATION_STATUS_SUCCESS;
-    case PersistentPrefStore::PREF_READ_ERROR_NO_FILE:
-      return INITIALIZATION_STATUS_CREATED_NEW_PREF_STORE;
-    default:
-      return INITIALIZATION_STATUS_ERROR;
-  }
-}
-
-bool PrefService::IsManagedPreference(const std::string& pref_name) const {
-  const Preference* pref = FindPreference(pref_name);
-  return pref && pref->IsManaged();
-}
-
-bool PrefService::IsPreferenceManagedByCustodian(
-    const std::string& pref_name) const {
-  const Preference* pref = FindPreference(pref_name);
-  return pref && pref->IsManagedByCustodian();
-}
-
-bool PrefService::IsUserModifiablePreference(
-    const std::string& pref_name) const {
-  const Preference* pref = FindPreference(pref_name);
-  return pref && pref->IsUserModifiable();
-}
-
-const base::DictionaryValue* PrefService::GetDictionary(
-    const std::string& path) const {
-  DCHECK(CalledOnValidThread());
-
-  const base::Value* value = GetPreferenceValue(path);
-  if (!value) {
-    NOTREACHED() << "Trying to read an unregistered pref: " << path;
-    return NULL;
-  }
-  if (value->GetType() != base::Value::TYPE_DICTIONARY) {
-    NOTREACHED();
-    return NULL;
-  }
-  return static_cast<const base::DictionaryValue*>(value);
-}
-
-const base::Value* PrefService::GetUserPrefValue(
-    const std::string& path) const {
-  DCHECK(CalledOnValidThread());
-
-  const Preference* pref = FindPreference(path);
-  if (!pref) {
-    NOTREACHED() << "Trying to get an unregistered pref: " << path;
-    return NULL;
-  }
-
-  // Look for an existing preference in the user store. If it doesn't
-  // exist, return NULL.
-  base::Value* value = NULL;
-  if (!user_pref_store_->GetMutableValue(path, &value))
-    return NULL;
-
-  if (!value->IsType(pref->GetType())) {
-    NOTREACHED() << "Pref value type doesn't match registered type.";
-    return NULL;
-  }
-
-  return value;
-}
-
-void PrefService::SetDefaultPrefValue(const std::string& path,
-                                      base::Value* value) {
-  DCHECK(CalledOnValidThread());
-  pref_registry_->SetDefaultPrefValue(path, value);
-}
-
-const base::Value* PrefService::GetDefaultPrefValue(
-    const std::string& path) const {
-  DCHECK(CalledOnValidThread());
-  // Lookup the preference in the default store.
-  const base::Value* value = NULL;
-  if (!pref_registry_->defaults()->GetValue(path, &value)) {
-    NOTREACHED() << "Default value missing for pref: " << path;
-    return NULL;
-  }
-  return value;
-}
-
-const base::ListValue* PrefService::GetList(const std::string& path) const {
-  DCHECK(CalledOnValidThread());
-
-  const base::Value* value = GetPreferenceValue(path);
-  if (!value) {
-    NOTREACHED() << "Trying to read an unregistered pref: " << path;
-    return NULL;
-  }
-  if (value->GetType() != base::Value::TYPE_LIST) {
-    NOTREACHED();
-    return NULL;
-  }
-  return static_cast<const base::ListValue*>(value);
-}
-
-void PrefService::AddPrefObserver(const std::string& path, PrefObserver* obs) {
-  pref_notifier_->AddPrefObserver(path, obs);
-}
-
-void PrefService::RemovePrefObserver(const std::string& path,
-                                     PrefObserver* obs) {
-  pref_notifier_->RemovePrefObserver(path, obs);
-}
-
-void PrefService::AddPrefInitObserver(base::Callback<void(bool)> obs) {
-  pref_notifier_->AddInitObserver(obs);
-}
-
-PrefRegistry* PrefService::DeprecatedGetPrefRegistry() {
-  return pref_registry_.get();
-}
-
-void PrefService::ClearPref(const std::string& path) {
-  DCHECK(CalledOnValidThread());
-
-  const Preference* pref = FindPreference(path);
-  if (!pref) {
-    NOTREACHED() << "Trying to clear an unregistered pref: " << path;
-    return;
-  }
-  user_pref_store_->RemoveValue(path, GetWriteFlags(pref));
-}
-
-void PrefService::Set(const std::string& path, const base::Value& value) {
-  SetUserPrefValue(path, value.DeepCopy());
-}
-
-void PrefService::SetBoolean(const std::string& path, bool value) {
-  SetUserPrefValue(path, new base::FundamentalValue(value));
-}
-
-void PrefService::SetInteger(const std::string& path, int value) {
-  SetUserPrefValue(path, new base::FundamentalValue(value));
-}
-
-void PrefService::SetDouble(const std::string& path, double value) {
-  SetUserPrefValue(path, new base::FundamentalValue(value));
-}
-
-void PrefService::SetString(const std::string& path, const std::string& value) {
-  SetUserPrefValue(path, new base::StringValue(value));
-}
-
-void PrefService::SetFilePath(const std::string& path,
-                              const base::FilePath& value) {
-  SetUserPrefValue(path, base::CreateFilePathValue(value));
-}
-
-void PrefService::SetInt64(const std::string& path, int64_t value) {
-  SetUserPrefValue(path, new base::StringValue(base::Int64ToString(value)));
-}
-
-int64_t PrefService::GetInt64(const std::string& path) const {
-  DCHECK(CalledOnValidThread());
-
-  const base::Value* value = GetPreferenceValue(path);
-  if (!value) {
-    NOTREACHED() << "Trying to read an unregistered pref: " << path;
-    return 0;
-  }
-  std::string result("0");
-  bool rv = value->GetAsString(&result);
-  DCHECK(rv);
-
-  int64_t val;
-  base::StringToInt64(result, &val);
-  return val;
-}
-
-void PrefService::SetUint64(const std::string& path, uint64_t value) {
-  SetUserPrefValue(path, new base::StringValue(base::Uint64ToString(value)));
-}
-
-uint64_t PrefService::GetUint64(const std::string& path) const {
-  DCHECK(CalledOnValidThread());
-
-  const base::Value* value = GetPreferenceValue(path);
-  if (!value) {
-    NOTREACHED() << "Trying to read an unregistered pref: " << path;
-    return 0;
-  }
-  std::string result("0");
-  bool rv = value->GetAsString(&result);
-  DCHECK(rv);
-
-  uint64_t val;
-  base::StringToUint64(result, &val);
-  return val;
-}
-
-base::Value* PrefService::GetMutableUserPref(const std::string& path,
-                                             base::Value::Type type) {
-  CHECK(type == base::Value::TYPE_DICTIONARY || type == base::Value::TYPE_LIST);
-  DCHECK(CalledOnValidThread());
-
-  const Preference* pref = FindPreference(path);
-  if (!pref) {
-    NOTREACHED() << "Trying to get an unregistered pref: " << path;
-    return NULL;
-  }
-  if (pref->GetType() != type) {
-    NOTREACHED() << "Wrong type for GetMutableValue: " << path;
-    return NULL;
-  }
-
-  // Look for an existing preference in the user store. If it doesn't
-  // exist or isn't the correct type, create a new user preference.
-  base::Value* value = NULL;
-  if (!user_pref_store_->GetMutableValue(path, &value) ||
-      !value->IsType(type)) {
-    if (type == base::Value::TYPE_DICTIONARY) {
-      value = new base::DictionaryValue;
-    } else if (type == base::Value::TYPE_LIST) {
-      value = new base::ListValue;
-    } else {
-      NOTREACHED();
-    }
-    user_pref_store_->SetValueSilently(path, make_scoped_ptr(value),
-                                       GetWriteFlags(pref));
-  }
-  return value;
-}
-
-void PrefService::ReportUserPrefChanged(const std::string& key) {
-  DCHECK(CalledOnValidThread());
-  user_pref_store_->ReportValueChanged(key, GetWriteFlags(FindPreference(key)));
-}
-
-void PrefService::SetUserPrefValue(const std::string& path,
-                                   base::Value* new_value) {
-  scoped_ptr<base::Value> owned_value(new_value);
-  DCHECK(CalledOnValidThread());
-
-  const Preference* pref = FindPreference(path);
-  if (!pref) {
-    NOTREACHED() << "Trying to write an unregistered pref: " << path;
-    return;
-  }
-  if (pref->GetType() != new_value->GetType()) {
-    NOTREACHED() << "Trying to set pref " << path
-                 << " of type " << pref->GetType()
-                 << " to value of type " << new_value->GetType();
-    return;
-  }
-
-  user_pref_store_->SetValue(path, std::move(owned_value), GetWriteFlags(pref));
-}
-
-void PrefService::UpdateCommandLinePrefStore(PrefStore* command_line_store) {
-  pref_value_store_->UpdateCommandLinePrefStore(command_line_store);
-}
-
-///////////////////////////////////////////////////////////////////////////////
-// PrefService::Preference
-
-PrefService::Preference::Preference(const PrefService* service,
-                                    const std::string& name,
-                                    base::Value::Type type)
-    : name_(name), type_(type), pref_service_(service) {
-  DCHECK(service);
-  // Cache the registration flags at creation time to avoid multiple map lookups
-  // later.
-  registration_flags_ = service->pref_registry_->GetRegistrationFlags(name_);
-}
-
-const std::string PrefService::Preference::name() const {
-  return name_;
-}
-
-base::Value::Type PrefService::Preference::GetType() const {
-  return type_;
-}
-
-const base::Value* PrefService::Preference::GetValue() const {
-  const base::Value* result= pref_service_->GetPreferenceValue(name_);
-  DCHECK(result) << "Must register pref before getting its value";
-  return result;
-}
-
-const base::Value* PrefService::Preference::GetRecommendedValue() const {
-  DCHECK(pref_service_->FindPreference(name_))
-      << "Must register pref before getting its value";
-
-  const base::Value* found_value = NULL;
-  if (pref_value_store()->GetRecommendedValue(name_, type_, &found_value)) {
-    DCHECK(found_value->IsType(type_));
-    return found_value;
-  }
-
-  // The pref has no recommended value.
-  return NULL;
-}
-
-bool PrefService::Preference::IsManaged() const {
-  return pref_value_store()->PrefValueInManagedStore(name_);
-}
-
-bool PrefService::Preference::IsManagedByCustodian() const {
-  return pref_value_store()->PrefValueInSupervisedStore(name_.c_str());
-}
-
-bool PrefService::Preference::IsRecommended() const {
-  return pref_value_store()->PrefValueFromRecommendedStore(name_);
-}
-
-bool PrefService::Preference::HasExtensionSetting() const {
-  return pref_value_store()->PrefValueInExtensionStore(name_);
-}
-
-bool PrefService::Preference::HasUserSetting() const {
-  return pref_value_store()->PrefValueInUserStore(name_);
-}
-
-bool PrefService::Preference::IsExtensionControlled() const {
-  return pref_value_store()->PrefValueFromExtensionStore(name_);
-}
-
-bool PrefService::Preference::IsUserControlled() const {
-  return pref_value_store()->PrefValueFromUserStore(name_);
-}
-
-bool PrefService::Preference::IsDefaultValue() const {
-  return pref_value_store()->PrefValueFromDefaultStore(name_);
-}
-
-bool PrefService::Preference::IsUserModifiable() const {
-  return pref_value_store()->PrefValueUserModifiable(name_);
-}
-
-bool PrefService::Preference::IsExtensionModifiable() const {
-  return pref_value_store()->PrefValueExtensionModifiable(name_);
-}
-
-const base::Value* PrefService::GetPreferenceValue(
-    const std::string& path) const {
-  DCHECK(CalledOnValidThread());
-
-  // TODO(battre): This is a check for crbug.com/435208. After analyzing some
-  // crash dumps it looks like the PrefService is accessed even though it has
-  // been cleared already.
-  CHECK(pref_registry_);
-  CHECK(pref_registry_->defaults());
-  CHECK(pref_value_store_);
-
-  const base::Value* default_value = NULL;
-  if (pref_registry_->defaults()->GetValue(path, &default_value)) {
-    const base::Value* found_value = NULL;
-    base::Value::Type default_type = default_value->GetType();
-    if (pref_value_store_->GetValue(path, default_type, &found_value)) {
-      DCHECK(found_value->IsType(default_type));
-      return found_value;
-    } else {
-      // Every registered preference has at least a default value.
-      NOTREACHED() << "no valid value found for registered pref " << path;
-    }
-  }
-
-  return NULL;
-}