JsonFileLoader.c

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class JsonFileLoader<Class T>
{
  protected static ref JsonSerializer m_Serializer = new JsonSerializer();
 
  static bool LoadFile(string filename, out T data, out string errorMessage)
  {
    if (FileExist(filename))
    {
      FileHandle handle = OpenFile(filename, FileMode.READ);
      if (handle == 0)
      {
        errorMessage = string.Format("Cannot open file \"%1\" for reading", filename);
        return false;
      }
 
      string fileContent;
      string lineContent;
      while (FGets(handle, lineContent) >= 0)
        fileContent += lineContent;
 
      CloseFile(handle);
 
      if (!m_Serializer)
        m_Serializer = new JsonSerializer();
 
      string error;
      if (!m_Serializer.ReadFromString(data, fileContent, error))
      {
        errorMessage = string.Format("Cannot load data from \"%1\":\n%2", filename, error);
        return false;
      }
 
      return true;
    }
    else
    {
      errorMessage = string.Format("File \"%1\" does not exist, check the provided path", filename, error);
      return false;
    }
  }
 
  static bool SaveFile(string filename, T data, out string errorMessage)
  {
    string fileContent;
 
    if (!m_Serializer)
      m_Serializer = new JsonSerializer();
 
    string makeDataError;
    if (!MakeData(data, fileContent, makeDataError, true))
    {
      errorMessage = string.Format("Cannot save data to file \"%1\", %2", filename, makeDataError);
      return false;
    }
 
    FileHandle handle = OpenFile(filename, FileMode.WRITE);
    if (handle == 0)
    {
      errorMessage = string.Format("Cannot open file \"%1\" for writing", filename);
      return false;
    }
 
    FPrint(handle, fileContent);
    CloseFile(handle);
 
    return true;
  }
 
  static bool LoadData(string string_data, out T data, out string errorMessage)
  {
    string error;
 
    if (!m_Serializer)
      m_Serializer = new JsonSerializer();
 
    if (!m_Serializer.ReadFromString(data, string_data, error))
    {
      errorMessage = string.Format("Cannot load provided JSON data (deserialization error) - check syntax: %1", error);
      return false;
    }
 
    return true;
  }
 
  static bool MakeData(T inputData, out string outputData, out string errorMessage, bool prettyPrint = true)
  {
    if (!m_Serializer)
      m_Serializer = new JsonSerializer();
 
    if (!m_Serializer.WriteToString(inputData, prettyPrint, outputData))
    {
      errorMessage = "Cannot create JSON from provided data (serialization error)";
      return false;
    }
 
    return true;
  }
 
 
 
  static void JsonLoadFile(string filename, out T data)
  {
 
    if (FileExist(filename))
    {
      string file_content;
      string line_content;
      string error;
 
      FileHandle handle = OpenFile(filename, FileMode.READ);
      if (handle == 0)
        return;
 
      while (FGets(handle, line_content) >= 0)
        file_content += line_content;
 
      CloseFile(handle);
 
      if (!m_Serializer)
        m_Serializer = new JsonSerializer();
 
      if (!m_Serializer.ReadFromString(data, file_content, error))
        ErrorEx(string.Format("Cannot load data from \"%1\":\n%2", filename, error));
    }
  }
 
  static void JsonSaveFile(string filename, T data)
  {
    string file_content;
    if (!m_Serializer)
      m_Serializer = new JsonSerializer();
 
    m_Serializer.WriteToString(data, true, file_content);
 
    FileHandle handle = OpenFile(filename, FileMode.WRITE);
    if (handle == 0)
      return;
 
    FPrint(handle, file_content);
    CloseFile(handle);
  }
 
  static void JsonLoadData(string string_data, out T data)
  {
    string error;
    if (!m_Serializer)
      m_Serializer = new JsonSerializer();
 
    if (!m_Serializer.ReadFromString(data, string_data, error))
      ErrorEx(string.Format("Cannot load data %1", error));
  }
 
  static string JsonMakeData(T data)
  {
    string string_data;
    if (!m_Serializer)
      m_Serializer = new JsonSerializer();
 
    m_Serializer.WriteToString(data, true, string_data);
    return string_data;
  }
 
  //#endif
}