for (Registration registration : registrationMap.values()) {
registrationList.add(registration);
}
if(registrationList.size()>0){
MergeSortAlgorithm sortAlgorithm = new MergeSortAlgorithm();
sortAlgorithm.sortRegistrationByDate(registrationList);
}
for (Registration registration : registrationList) {
Student student = (Student) registration.getStudent().getPersonType("student");
GDDate registrationDate = new GDDate(registration.getRegistrationDate());