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// Copyright (c) 2011 The Chromium OS 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 CHROMEOS_PLATFORM_UPDATE_ENGINE_PREFS_INTERFACE_H__
#define CHROMEOS_PLATFORM_UPDATE_ENGINE_PREFS_INTERFACE_H__
#include <string>
namespace chromeos_update_engine {
// The prefs interface allows access to a persistent preferences
// store. The two reasons for providing this as an interface are
// testing as well as easier switching to a new implementation in the
// future, if necessary.
class PrefsInterface {
public:
// Gets a string |value| associated with |key|. Returns true on
// success, false on failure (including when the |key| is not
// present in the store).
virtual bool GetString(const std::string& key, std::string* value) = 0;
// Associates |key| with a string |value|. Returns true on success,
// false otherwise.
virtual bool SetString(const std::string& key, const std::string& value) = 0;
// Gets an int64 |value| associated with |key|. Returns true on
// success, false on failure (including when the |key| is not
// present in the store).
virtual bool GetInt64(const std::string& key, int64_t* value) = 0;
// Associates |key| with an int64 |value|. Returns true on success,
// false otherwise.
virtual bool SetInt64(const std::string& key, const int64_t value) = 0;
// Returns true if the setting exists (i.e. a file with the given key
// exists in the prefs directory)
virtual bool Exists(const std::string& key) = 0;
// Returns true if successfully deleted the file corresponding to
// this key. Calling with non-existent keys does nothing.
virtual bool Delete(const std::string& key) = 0;
virtual ~PrefsInterface() {}
};
} // namespace chromeos_update_engine
#endif // CHROMEOS_PLATFORM_UPDATE_ENGINE_PREFS_INTERFACE_H__
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