private Set<ShiftType> getNonAssociatedTeachersShiftTypes(ExecutionCourse executionCourse) {
Set<ShiftType> nonAssociatedTeachersShiftTypes = new HashSet<ShiftType>();
for (Shift shift : executionCourse.getAssociatedShifts()) {
if (shift.getDegreeTeachingServicesSet().isEmpty()
&& shift.getNonRegularTeachingServicesSet().isEmpty()) {
nonAssociatedTeachersShiftTypes.addAll(shift.getTypes());
}
}
return nonAssociatedTeachersShiftTypes;
}
