public bool CanSubstituteOnExam(Professor newAdministrator, Subject onSubject)
{
return(Exams.FirstOrNone(app => app.ForExam.OnSubject == onSubject)
.Map(app => app.For(app.ForExam.Substitute(newAdministrator)))
.Map(Validate)
.Reduce(false));
}
public void SubstituteOnExam(Professor newAdministrator, Subject onSubject)
{
if (!this.CanSubstituteOnExam(newAdministrator, onSubject))
{
throw new ArgumentException();
}
this.Exams
.Select(app => app.ForExam.OnSubject == onSubject ?
app.For(app.ForExam.Substitute(newAdministrator)) :
app)
.ToList();
}
// Returns factory function for the exam application
public Func <IExamApplication> GetExamApplicationFactory(Subject examOn, Professor administratedBy)
{
ExamApplicationBuilder builder = new ExamApplicationBuilder();
builder.OnSubject(examOn);
builder.AdministratedBy(administratedBy);
builder.TakenBy(this);
if (builder.CanBuild())
{
return(builder.Build);
}
// think of something smarter;
throw new ArgumentException();
}
