public override void Execute()
{
if (this.Data.Length != 3)
{
throw new InvalidCommandException(this.Input);
}
string entityToDisplay = this.Data[1].ToLower();
string sortType = this.Data[2].ToLower();
switch (entityToDisplay)
{
case "students":
IComparer <IStudent> studentComparator = this.CreateStudentComparator(sortType);
ISimpleOrderedBag <IStudent> studentList = this.repository.GetAllStudentsSorted(studentComparator);
OutputWriter.DisplayStudentMessage(studentList.JoinWith(Environment.NewLine));
break;
case "courses":
IComparer <ICourse> courseComparator = this.CreateCourseComparator(sortType);
ISimpleOrderedBag <ICourse> courseList = this.repository.GetAllCoursesSorted(courseComparator);
OutputWriter.DisplayCourseMessage(courseList.JoinWith(Environment.NewLine));
break;
default:
throw new InvalidCommandException(this.Input);
}
}
public void GetAllStudentsFromCourse(string courseName)
{
if (this.IsQueryForCoursePossible(courseName))
{
OutputWriter.DisplayCourseMessage($"{courseName}:");
foreach (KeyValuePair <string, IStudent> studentMarksEntry in this.courses[courseName].StudentsByName)
{
this.GetStudentsScoresFromCourse(courseName, studentMarksEntry.Key);
}
}
}
public void GetAllCourses()
{
if (!this.isDataInitialized)
{
throw new DataException();
}
OutputWriter.DisplayCourseMessage($"Number of courses: {this.courses.Count}");
foreach (KeyValuePair <string, Course> course in this.courses.OrderBy(c => c.Value.Name))
{
OutputWriter.DisplayCourseMessage(course.Value.Name);
}
}
public void GetAllStudents()
{
if (!this.isDataInitialized)
{
throw new DataException();
}
Dictionary <string, Student> allStudents = new Dictionary <string, Student>();
foreach (KeyValuePair <string, Course> course in this.courses)
{
foreach (KeyValuePair <string, Student> student in course.Value.StudentsByName)
{
allStudents.Add(student.Key, student.Value);
}
}
OutputWriter.DisplayCourseMessage($"Number of students: {allStudents.Count}");
foreach (KeyValuePair <string, Student> student in allStudents.OrderByDescending(s => s.Value.MarksByCourseName.Average(m => m.Value)))
{
OutputWriter.DisplayStudentMessage($"{student.Value.Username} - {student.Value.MarksByCourseName.Average(s => s.Value):F2}");
}
}