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// 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.
#ifndef CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_PROVIDER_H_
#define CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_PROVIDER_H_
#include <string>
#include "base/callback.h"
namespace base {
class Value;
}
namespace chromeos {
class CrosSettingsProvider {
public:
// The callback type that is called to notify the CrosSettings observers
// about a setting change.
typedef base::Callback<void(const std::string&)> NotifyObserversCallback;
// Creates a new provider instance. |notify_cb| will be used to notify
// about setting changes.
explicit CrosSettingsProvider(const NotifyObserversCallback& notify_cb);
virtual ~CrosSettingsProvider();
// Sets |in_value| to given |path| in cros settings.
void Set(const std::string& path, const base::Value& in_value);
// Gets settings value of given |path| to |out_value|.
virtual const base::Value* Get(const std::string& path) const = 0;
// Requests the provider to fetch its values from a trusted store, if it
// hasn't done so yet. Returns true if the values returned by this provider
// are trusted during the current loop cycle; otherwise returns false, and
// |callback| will be invoked later when trusted values become available.
// PrepareTrustedValues() should be tried again in that case.
virtual bool PrepareTrustedValues(const base::Closure& callback) = 0;
// Gets the namespace prefix provided by this provider.
virtual bool HandlesSetting(const std::string& path) const = 0;
// Reloads the caches if the provider has any.
virtual void Reload() = 0;
void SetNotifyObserversCallback(const NotifyObserversCallback& notify_cb);
protected:
// Notifies the observers about a setting change.
void NotifyObservers(const std::string& path);
private:
// Does the real job for Set().
virtual void DoSet(const std::string& path,
const base::Value& in_value) = 0;
// Callback used to notify about setting changes.
NotifyObserversCallback notify_cb_;
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_PROVIDER_H_
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