public override void Execute()
{
string[] data = this.Data;
if (data.Length != 3)
{
throw new ArgumentException(this.Input);
}
string entityToDisplay = data[1];
string sortType = data[2];
if (entityToDisplay.Equals("students", StringComparison.OrdinalIgnoreCase))
{
IComparer <Student> studentComparator = this.CreateStudentComparator(sortType);
ISimpleOrderedBag <Student> list = this.repository.GetAllStudentsSorted(studentComparator);
OutputWriter.WriteMessageOnNewLine(list.JointWith(Environment.NewLine));
}
else if (entityToDisplay.Equals("courses", StringComparison.OrdinalIgnoreCase))
{
IComparer <Course> courseComparator = this.CreateCourseComparator(sortType);
ISimpleOrderedBag <Course> list = this.repository.GetAllCoursesSorted(courseComparator);
OutputWriter.WriteMessageOnNewLine(list.JointWith(Environment.NewLine));
}
else
{
throw new InvalidCommandException(this.Input);
}
}