/// <summary>
/// Finds the Object that matches the given ID in the Entitie's storage file.
/// </summary>
/// <typeparam name="T">The type of Object that should be returned</typeparam>
/// <param name="id">The ID of the Object</param>
/// <exception cref="DuplicateDataException">More than one object with this ID was found.</exception>
/// <returns>Object if ID can be found.
/// Null if ID cannot be found.</returns>
public T GetByID <T>(Guid id)
where T : Storable, new()
{
string path = du.GetPath(typeof(T));
Matches matches = (x) => x[0].Equals(id.ToString());
List <string[]> matchingLines = GetAllMatchingLines(matches, path);
if (matchingLines.Count == 0)
{
return(null);
}
else if (matchingLines.Count != 1)
{
throw new DuplicateDataException("id occured multiple times in the file.");
}
return(CreateNew <T>(matchingLines.First(), new T()));
}
/// <summary>
/// Stores objects of the Type Course, Lecturer, Major, Rating, Student, University.
/// Will return true if successfull and false if an error occured.
/// </summary>
/// <param name="o"></param>
/// <returns>true when storing was successfull. Otherwise false</returns>
public bool Store(Object o)
{
try
{
string path = du.GetPath(o);
string info = o.ToString();
File.AppendAllText(path, info);
return(true);
}
catch (Exception)
{
return(false);
}
}
public void DeleteAllTestDataFromTextFiles()
{
DataUtility du = new DataUtility();
File.WriteAllText(du.GetPath(typeof(University)), String.Empty);
File.WriteAllText(du.GetPath(typeof(Course)), String.Empty);
File.WriteAllText(du.GetPath(typeof(Lecturer)), String.Empty);
File.WriteAllText(du.GetPath(typeof(Major)), String.Empty);
File.WriteAllText(du.GetPath(typeof(Rating)), String.Empty);
File.WriteAllText(du.GetPath(typeof(Student)), String.Empty);
}