Implement an initial extension settings API.

chrome/browser/extensions/extension_settings_noop_storage.cc

+// Copyright (c) 2011 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/extensions/extension_settings_noop_storage.h"
+
+#include "base/bind.h"
+#include "base/message_loop.h"
+#include "base/task.h"
+
+namespace {
+
+// Calls OnSuccess() of a callback with settings, after posting back to the UI
+// thread.
+class SuccessResultClosure {
+ public:
+  SuccessResultClosure(ExtensionSettingsStorage::Callback* callback,
+      DictionaryValue* settings) : callback_(callback), settings_(settings) {
+  }
+
+  ~SuccessResultClosure() {
+    delete callback_;
+  }
+
+  void Run() {
+    MessageLoop::current()->PostTask(FROM_HERE,
+        base::Bind(&SuccessResultClosure::Run2, base::Unretained(this)));
+  }
+
+ private:
+  void Run2() {
+    callback_->OnSuccess(settings_);
+    delete this;
+  }
+
+  ExtensionSettingsStorage::Callback* callback_;
+  DictionaryValue* settings_;
+};
+
+}  // namespace
+
+void ExtensionSettingsNoopStorage::Get(const std::string& key,
+    ExtensionSettingsStorage::Callback* callback) {
+  (new SuccessResultClosure(callback, new DictionaryValue()))->Run();
+}
+
+void ExtensionSettingsNoopStorage::Get(const ListValue& keys,
+    ExtensionSettingsStorage::Callback* callback) {
+  (new SuccessResultClosure(callback, new DictionaryValue()))->Run();
+}
+
+void ExtensionSettingsNoopStorage::Get(
+    ExtensionSettingsStorage::Callback* callback) {
+  (new SuccessResultClosure(callback, new DictionaryValue()))->Run();
+}
+
+void ExtensionSettingsNoopStorage::Set(const std::string& key,
+    const Value& value, ExtensionSettingsStorage::Callback* callback) {
+  DictionaryValue* settings = new DictionaryValue();
+  settings->Set(key, value.DeepCopy());
+  (new SuccessResultClosure(callback, settings))->Run();
+}
+
+void ExtensionSettingsNoopStorage::Set(const DictionaryValue& values,
+    ExtensionSettingsStorage::Callback* callback) {
+  (new SuccessResultClosure(callback, values.DeepCopy()))->Run();
+}
+
+void ExtensionSettingsNoopStorage::Remove(const std::string& key,
+    ExtensionSettingsStorage::Callback *callback) {
+  (new SuccessResultClosure(callback, new DictionaryValue()))->Run();
+}
+
+void ExtensionSettingsNoopStorage::Remove(const ListValue& keys,
+    ExtensionSettingsStorage::Callback *callback) {
+  (new SuccessResultClosure(callback, new DictionaryValue()))->Run();
+}
+
+void ExtensionSettingsNoopStorage::Clear(
+    ExtensionSettingsStorage::Callback* callback) {
+  (new SuccessResultClosure(callback, new DictionaryValue()))->Run();
+}