EntityUtils.h

Go to the documentation of this file.

// Copyright (c) XJ Music Inc. (https://xjmusic.com) All Rights Reserved.
 
#ifndef XJMUSIC_ENTITY_UTILS_H
#define XJMUSIC_ENTITY_UTILS_H
 
#include <map>
#include <string>
#include <chrono>
 
#include <nlohmann/json.hpp>
 
#include "xjmusic/music/Note.h"
 
using json = nlohmann::json;
 
namespace XJ {
 
  using UUID = std::string;
  static unsigned long long UNIQUE_ID_COUNTER = 0;
 
  class EntityUtils {
  public:
 
    virtual ~EntityUtils() = default;
 
    template<typename A, typename B>
    static std::map<B, A> reverseMap(const std::map<A, B> &originalMap) {
      std::map<B, A> reverseMap;
      for (const auto &pair: originalMap) {
        reverseMap[pair.second] = pair.first;
      }
      return reverseMap;
    }
 
    static long long currentTimeMillis() {
      return std::chrono::duration_cast<std::chrono::milliseconds>(
          std::chrono::system_clock::now().time_since_epoch()
      ).count();
    }
 
    static std::string computeUniqueId();
 
    static void setRequired(const json &json, const std::string &key, UUID &value);
 
    static void setIfNotNull(const json &json, const std::string &key, std::string &value);
 
    static void setIfNotNull(const json &json, const std::string &key, float &value);
 
    static void setIfNotNull(const json &json, const std::string &key, bool &value);
 
    static void setIfNotNull(const json &json, const std::string &key, int &value);
 
    static void setIfNotNull(const json &json, const std::string &key, long long &value);
  };
 
}// namespace XJ
 
#endif//XJMUSIC_ENTITY_UTILS_H