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// Copyright (c) 2010 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.
#ifndef CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_H_
#define CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_H_
#pragma once
#include <string>
#include <vector>
#include "base/hash_tables.h"
#include "base/observer_list.h"
#include "base/singleton.h"
#include "base/threading/non_thread_safe.h"
#include "chrome/browser/chromeos/cros_settings_names.h"
#include "chrome/common/notification_observer.h"
namespace base {
template <typename T> struct DefaultLazyInstanceTraits;
}
class Value;
namespace chromeos {
class CrosSettingsProvider;
// A class manages per-device/global settings.
class CrosSettings : public base::NonThreadSafe {
public:
// Class factory.
static CrosSettings* Get();
// Helper function to test if given path is a value cros settings name.
static bool IsCrosSettings(const std::string& path);
// Sets |in_value| to given |path| in cros settings.
// Note that this takes ownership of |in_value|.
void Set(const std::string& path, Value* in_value);
// Fires system setting change notification.
void FireObservers(const char* path);
// Gets settings value of given |path| to |out_value|.
// Note that the caller owns |out_value| returned.
bool Get(const std::string& path, Value** out_value) const;
// Convenience forms of Set(). These methods will replace any existing
// value at that path, even if it has a different type.
void SetBoolean(const std::string& path, bool in_value);
void SetInteger(const std::string& path, int in_value);
void SetDouble(const std::string& path, double in_value);
void SetString(const std::string& path, const std::string& in_value);
// These are convenience forms of Get(). The value will be retrieved
// and the return value will be true if the path is valid and the value at
// the end of the path can be returned in the form specified.
bool GetBoolean(const std::string& path, bool* out_value) const;
bool GetInteger(const std::string& path, int* out_value) const;
bool GetDouble(const std::string& path, double* out_value) const;
bool GetString(const std::string& path, std::string* out_value) const;
// adding/removing of providers
bool AddSettingsProvider(CrosSettingsProvider* provider);
bool RemoveSettingsProvider(CrosSettingsProvider* provider);
// If the pref at the given path changes, we call the observer's Observe
// method with PREF_CHANGED.
void AddSettingsObserver(const char* path, NotificationObserver* obs);
void RemoveSettingsObserver(const char* path, NotificationObserver* obs);
private:
// List of ChromeOS system settings providers.
std::vector<CrosSettingsProvider*> providers_;
// A map from settings names to a list of observers. Observers get fired in
// the order they are added.
typedef ObserverList<NotificationObserver> NotificationObserverList;
typedef base::hash_map<std::string, NotificationObserverList*>
SettingsObserverMap;
SettingsObserverMap settings_observers_;
CrosSettings();
~CrosSettings();
CrosSettingsProvider* GetProvider(const std::string& path) const;
friend struct base::DefaultLazyInstanceTraits<CrosSettings>;
DISALLOW_COPY_AND_ASSIGN(CrosSettings);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_H_
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