Abstract pref storage from net::SdchOwner

ios/crnet/sdch_owner_pref_storage.cc

+// Copyright 2015 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 "ios/crnet/sdch_owner_pref_storage.h"
+
+#include "base/prefs/persistent_pref_store.h"
+#include "base/values.h"
+
+namespace {
+
+static const char kStorageKey[] = "SDCH";
+
+}  // namespace
+
+SdchOwnerPrefStorage::SdchOwnerPrefStorage(PersistentPrefStore* storage)
+    : storage_(storage),
+      storage_key_(KStorageKey),
+      init_observer_(nullptr) {
+}
+
+SdchOwnerPrefStorage::~SdchOwnerPrefStorage() {
+  if (init_observer_)
+    storage_->RemoveObserver(this);
+}
+
+net::SdchOwner::PrefStorage::ReadError
+SdchOwnerPrefStorage::GetReadError() const {
+  PersistentPrefStore::PrefReadError error = storage_->GetReadError();
+
+  DCHECK_NE(error,
+            PersistentPrefStore::PREF_READ_ERROR_ASYNCHRONOUS_TASK_INCOMPLETE);
+  DCHECK_NE(error, PersistentPrefStore::PREF_READ_ERROR_MAX_ENUM);
+
+  switch (error) {
+    case PersistentPrefStore::PREF_READ_ERROR_NONE:
+      return PERSISTENCE_FAILURE_NONE;
+
+    case PersistentPrefStore::PREF_READ_ERROR_NO_FILE:
+      return PERSISTENCE_FAILURE_REASON_NO_FILE;
+
+    case PersistentPrefStore::PREF_READ_ERROR_JSON_PARSE:
+    case PersistentPrefStore::PREF_READ_ERROR_JSON_TYPE:
+    case PersistentPrefStore::PREF_READ_ERROR_FILE_OTHER:
+    case PersistentPrefStore::PREF_READ_ERROR_FILE_LOCKED:
+    case PersistentPrefStore::PREF_READ_ERROR_JSON_REPEAT:
+      return PERSISTENCE_FAILURE_REASON_READ_FAILED;
+
+    case PersistentPrefStore::PREF_READ_ERROR_ACCESS_DENIED:
+    case PersistentPrefStore::PREF_READ_ERROR_FILE_NOT_SPECIFIED:
+    case PersistentPrefStore::PREF_READ_ERROR_ASYNCHRONOUS_TASK_INCOMPLETE:
+    case PersistentPrefStore::PREF_READ_ERROR_MAX_ENUM:
+    default:
+      // We don't expect these other failures given our usage of prefs.
+      NOTREACHED();
+      return PERSISTENCE_FAILURE_OTHER;
+  }
+}
+
+bool SdchOwnerPrefStorage::GetValue(
+      const base::DictionaryValue** result) const {
+  const base::Value* result_value = nullptr;
+  if (!storage_->GetValue(storage_key_, &result_value))
+    return false;
+  return result_value->GetAsDictionary(result);
+}
+
+bool SdchOwnerPrefStorage::GetMutableValue(base::DictionaryValue** result) {
+  base::Value* result_value = nullptr;
+  if (!storage_->GetMutableValue(storage_key_, &result_value))
+    return false;
+  return result_value->GetAsDictionary(result);
+}
+
+void SdchOwnerPrefStorage::SetValue(scoped_ptr<base::DictionaryValue> value) {
+  storage_->SetValue(storage_key_, std::move(value),
+                     WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS);
+}
+
+void SdchOwnerPrefStorage::ReportValueChanged() {
+  storage_->ReportValueChanged(storage_key_,
+                               WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS);
+}
+
+bool SdchOwnerPrefStorage::IsInitializationComplete() {
+  return storage_->IsInitializationComplete();
+}
+
+void SdchOwnerPrefStorage::StartObservingInit(net::SdchOwner* observer) {
+  DCHECK(!init_observer_);
+  init_observer_ = observer;
+  storage_->AddObserver(this);
+}
+
+void SdchOwnerPrefStorage::StopObservingInit() {
+  DCHECK(init_observer_);
+  init_observer_ = nullptr;
+  storage_->RemoveObserver(this);
+}
+
+void SdchOwnerPrefStorage::OnPrefValueChanged(const std::string& key) {
+}
+
+void SdchOwnerPrefStorage::OnInitializationCompleted(bool succeeded) {
+  DCHECK(init_observer_);
+  init_observer_->OnPrefStorageInitializationComplete(succeeded);
+}