src/common/options.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.

#ifndef COMMON_OPTIONS_H_
#define COMMON_OPTIONS_H_

#include <map>
#include <string>
#include <vector>

#include "common/private/minimal_base.h"

template <typename T> struct DefaultSingletonTraits;

namespace arc {

// Options are key value pairs sent from JavaScript when the plugin was
// created. A lot of the options are metadata as defined in
// src/build/metadata/definitions.json. Some options are generated by
// JavaScript code.
struct Options {
  // Retrieve options of various types. If name does not exist and no default
  // value is provided then we abort.
  bool GetBool(const std::string& name) const;
  bool GetBool(const std::string& name, bool default_value) const;
  double GetDouble(const std::string& name) const;
  int GetInt(const std::string& name) const;
  std::string GetString(const std::string& name) const;
  std::string GetString(const std::string& name,
                        const std::string& default_value) const;
  std::vector<std::string> GetStringVector(const std::string& name) const;

  // Should probably only be used by instance_dispatcher and testing code.
  // Some values are cached locally so changing the value here might not take
  // effect after startup. Also Put is NOT thread safe with itself or any Get*
  // functions. Currently we only call it early in the initialization process
  // before threads are created.
  void Put(const std::string& name, const std::string& value);

  // Singleton
  static Options* GetInstance();

 private:
  Options();
  ~Options();
  friend struct DefaultSingletonTraits<Options>;

  std::map<std::string, std::string> options_map_;

  COMMON_DISALLOW_COPY_AND_ASSIGN(Options);
};

}  // namespace arc

#endif  // COMMON_OPTIONS_H_