/// <summary>
/// Write the list of name to storage
/// </summary>
/// <param name="file">file name and path</param>
/// <param name="names">list of name object</param>
public static void WriteNamesToStorage(NamesFile file, List <Name> names)
{
string namesString;
//
//create storage and message object from the factory
//
IStorage storage = StorageFactory.CreatStorage(file);
IMessage promptMessage = MessageFactory.CreatMessage(Message.MessageType.Prompt);
//
//convert list of name object to a string
//
namesString = NamesStringConverter.ConvertNamesToString(names);
//
//write names string to storage
//
storage.WriteData(namesString);
//
//give user a message of writing completion at the end
//
promptMessage.DisplayMessage("Writing data to " + file.WriteFilePath + " is completed");
}
/// <summary>
/// get file name/path from command parameter,otherwise display an error mesasge
/// </summary>
/// <param name="args">commad parameters</param>
/// <param name="writeFilePath"></param>
/// <returns></returns>
public static NamesFile GetFile(string[] args, string writeFilePath)
{
NamesFile file = null;
//
//first command parameter is file name/path for reading names
//
int argsReadFileElementIndex = 0;
//
//create a error message object from the factory
//
IMessage errorMessage = MessageFactory.CreatMessage(Message.MessageType.Error);
//
//if command parameter is not suppied or file does not exist,give an error message on screen.
//otherwise return the file object
//
if (args.Length == 0 || string.IsNullOrEmpty(args[argsReadFileElementIndex]))
{
errorMessage.DisplayMessage("No unsorted names file path being supplied!");
}
else if (!File.Exists(args[argsReadFileElementIndex]))
{
errorMessage.DisplayMessage("File not existed " + args[argsReadFileElementIndex]);
}
else
{
file = new NamesFile(args[argsReadFileElementIndex], writeFilePath);
}
return(file);
}
/// <summary>
/// Help read data from a storage; convert data into list of name object
/// </summary>
/// <param name="file">storage file</param>
/// <returns></returns>
public static List <Name> ReadNamesFromStorage(NamesFile file)
{
string namesString;
List <Name> names;
//
//create storage and message object from the respective factories
//
IStorage storage = StorageFactory.CreatStorage(file);
IMessage promptMessage = MessageFactory.CreatMessage(Message.MessageType.Prompt);
//
//read name list into a string from a storage
//
namesString = storage.ReadData();
//
//make a list of name object from the names in string
//
names = NamesStringConverter.ConvertStringToNames(namesString);
//
//give a reading completion message on screen
//
promptMessage.DisplayMessage("Reading data from " + file.ReadFilePath + " is completed");
return(names);
}
public static IStorage CreatStorage(NamesFile filePath)
{
return(new FileStorage(filePath));
}
