public static SortedDictionary<string, List<Student>> Parse(string filename)
{
string line;
var dictionary = new SortedDictionary<string, List<Student>>();
// Read the file and display it line by line.
StreamReader file = new StreamReader(filename);
while ((line = file.ReadLine()) != null)
{
var values = line.Split(new char[] { '|' }, StringSplitOptions.RemoveEmptyEntries);
var course = values[2].Trim();
var student = new Student()
{
FirstName = values[0].Trim(),
LastName = values[1].Trim()
};
if (!dictionary.ContainsKey(course))
{
var students = new List<Student>();
students.Add(student);
dictionary.Add(course, students);
}
else
{
dictionary[course].Add(student);
}
}
file.Close();
return dictionary;
}
static void Main()
{
var studentsByCourse = new SortedDictionary<string, SortedSet<Student>>();
using (StreamReader streamReader = new StreamReader("../../InputFile/Students.txt"))
{
string line;
while ((line = streamReader.ReadLine()) != null)
{
string[] tokens = line.Split('|');
string firstName = tokens[0].Trim();
string lastName = tokens[1].Trim();
string course = tokens[2].Trim();
Student currentStudent = new Student(firstName, lastName, course);
if (!studentsByCourse.ContainsKey(course))
{
studentsByCourse.Add(course, new SortedSet<Student>());
}
studentsByCourse[course].Add(currentStudent);
}
}
foreach (var course in studentsByCourse)
{
Console.WriteLine(course.Key + ": " + String.Join(", ", course.Value));
}
}
public void TestCourseAddSameStudentShouldThrow()
{
var course = new Course("C#");
var student = new Student("Pesho", 10111);
course.JoinCourse(student);
course.JoinCourse(student);
}
public void TestCourseAddCorrectStudentShouldNotThrow()
{
var course = new Course("C#");
var student = new Student("Pesho", 10111);
course.JoinCourse(student);
Assert.AreEqual(student, course.Students[0]);
}
public void RemoveStudent(Student studentToRemove)
{
if (studentToRemove == null)
{
throw new ArgumentNullException("You are trying to add null as a student to student list");
}
this.students.Remove(studentToRemove);
}
public void TestCourseRemoveExistantStudentShouldNotThrow()
{
var course = new Course("C#");
var student = new Student("Pesho", 10111);
course.JoinCourse(student);
course.LeaveCourse(student);
Assert.IsFalse(course.Students.Contains(student));
}
private static void PersistData(Student student, string course)
{
if (!data.ContainsKey(course))
{
data[course] = new SortedSet<Student>();
}
data[course].Add(student);
}
public void AddStudent(Student studentToAdd)
{
if (studentToAdd == null)
{
throw new ArgumentNullException("You are trying to add null as a student to student list");
}
this.students.Add(studentToAdd);
}
public void JoinSchool(Student student)
{
Validator.ObjectNotNullValidator(student, "Student");
if (this.Students.Contains(student))
{
throw new InvalidOperationException(string.Join("Student {0} has already been enrolled", student.StudentId, this.Name));
}
this.Students.Add(student);
}
public void LeaveCourse(Student student)
{
Validator.ObjectNotNullValidator(student, "Student");
if (!this.Students.Contains(student))
{
throw new InvalidOperationException(string.Join("Student {0} has not joined {1} course", student.StudentId, this.Name));
}
this.Students.Remove(student);
}
public void JoinCourse(Student student)
{
Validator.ObjectNotNullValidator(student, "Student");
if (this.Students.Count > MaxStudents)
{
throw new InvalidOperationException("Course is full");
}
if (this.Students.Contains(student))
{
throw new InvalidOperationException(string.Join("Student {0} has already joined {1} course", student.StudentId, this.Name));
}
this.Students.Add(student);
}
private static void ParseInput()
{
using (StreamReader reader = new StreamReader("../../students.txt"))
{
while (!reader.EndOfStream)
{
string currentLine = reader.ReadLine();
string[] lineParams = currentLine.Split('|');
string firstName = lineParams[0].Trim();
string lastName = lineParams[1].Trim();
string course = lineParams[2].Trim();
Student student = new Student()
{
FirstName = firstName,
LastName = lastName
};
PersistData(student, course);
}
}
}
public void TestStudentHasExpectedName()
{
var student = new Student("Pesho", 10111);
Assert.AreEqual("Pesho", student.Name);
}
public void TestStudentHasExpectedId()
{
var student = new Student("Pesho", 10111);
Assert.AreEqual(10111, student.StudentId);
}
public void TestNullStudentNameShouldThrow()
{
var student = new Student(null, 10111);
}
public void TestInvalidLowStudentIdShouldThrow()
{
var student = new Student("Pesho", 1);
}
public void TestInvalidHighStudentIdShouldThrow()
{
var student = new Student("Pesho", 100000);
}
public void TestCourseRemoveNotExistantStudentShouldThrow()
{
var course = new Course("C#");
var student = new Student("Pesho", 10111);
course.LeaveCourse(student);
}
public void TestCreateValidStudentShouldNotThrow()
{
var student = new Student("Pesho", 10111);
}
public void TestEmptyStudentNameShouldThrow()
{
var student = new Student(string.Empty, 10111);
}
