Adds ChromecastConfig to manage cast_shell's PrefService.

chromecast/common/chromecast_config.h

+// Copyright 2014 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.
+//
+// Chromecast-specific configurations retrieved from and stored into a given
+// configuration file.
+
+#ifndef CHROMECAST_COMMON_CHROMECAST_CONFIG_H_
+#define CHROMECAST_COMMON_CHROMECAST_CONFIG_H_
+
+#include <string>
+
+#include "base/files/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/prefs/pref_service.h"
+#include "base/threading/sequenced_worker_pool.h"
+#include "base/threading/thread_checker.h"
+
+class PrefRegistrySimple;
+
+namespace chromecast {
+
+// Manages configuration for Chromecast via PrefService.
+// It uses JsonPrefStore internally and/so the format of config file is same to
+// that of JsonPrefStore.
+// It is NOT thread-safe; all functions must be run on the same thread as
+// the object is created.
+class ChromecastConfig {
+ public:
+  // Creates new singleton instance of ChromecastConfig.
+  static void Create(PrefRegistrySimple* registry);
+
+  // Returns the singleton instance of ChromecastConfig.
+  static ChromecastConfig* GetInstance();
+
+  // Saves configs into configuration file.
+  void Save() const;
+
+  // Returns string value for key, if present.
+  const std::string GetValue(const std::string& key) const;
+
+  // Returns integer value for key, if present.
+  const int GetIntValue(const std::string& key) const;
+
+  // Sets new string value for key.
+  void SetValue(const std::string& key, const std::string& value) const;
+
+  // Sets new int value for key.
+  void SetIntValue(const std::string& key, int value) const;
+
+  scoped_refptr<base::SequencedWorkerPool> worker_pool() const {
+    return worker_pool_;
+  }
+
+  PrefService* pref_service() const { return pref_service_.get(); }
+
+ private:
+  ChromecastConfig();
+  ~ChromecastConfig();
+
+  // Loads configs from config file. Returns true if successful.
+  bool Load(PrefRegistrySimple* registry);
+
+  // Registers any needed preferences for the current platform.
+  void RegisterPlatformPrefs(PrefRegistrySimple* registry);
+
+  // Global singleton instance.
+  static ChromecastConfig* g_instance_;
+
+  const base::FilePath config_path_;
+  const scoped_refptr<base::SequencedWorkerPool> worker_pool_;
+  scoped_ptr<PrefService> pref_service_;
+
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromecastConfig);
+};
+
+}  // namespace chromecast
+
+#endif  // CHROMECAST_COMMON_CHROMECAST_CONFIG_H_