/// <summary>
/// Gets students but also does filtering query on them
/// </summary>
/// <param name="courseName"></param>
/// <param name="sorting">Choose either Filtering or Ordering</param>
/// <param name="criteria">Filtering - by performance, Sorting - Ascending, Descending</param>
/// <param name="takeNumber">Amount of items to take</param>
public void GetAllStudentsFromCourse(string courseName, SortingOperation sorting, string criteria = null, int takeNumber = -1)
{
if (sorting == SortingOperation.None)
{
GetAllStudentsFromCourse(courseName);
}
else if (IsQueryForCoursePossible(courseName))
{
//Extract the student names and their marks
var studentsWithMarks = courses[courseName].StudentsByName.ToDictionary(k => k.Key, v => v.Value.MarksByCourseName[courseName]);
if (sorting == SortingOperation.Filter)
{
studentsWithMarks = filter.FilterAndTake(studentsWithMarks, criteria, takeNumber) as Dictionary <string, double>;
}
else if (sorting == SortingOperation.Order)
{
studentsWithMarks = sorter.OrderAndTake(studentsWithMarks, criteria, takeNumber) as Dictionary <string, double>;
}
if (studentsWithMarks is null)
{
return;
}
foreach (var student in studentsWithMarks)
{
OutputWriter.PrintStudent(student);
}
}
}
public QuerySorter(string field, SortingOperation sortingOperation)
{
ConditionChecker.Requires(string.IsNullOrEmpty(field) == false);
this.Field = field;
this.SortingOperation = sortingOperation;
}