public boolean addShift(Shift aShift) {
boolean wasAdded = false;
if (shifts.contains(aShift)) {
return false;
}
if (shifts.contains(aShift)) {
return false;
}
if (shifts.contains(aShift)) {
return false;
}
Employee existingEmployee = aShift.getEmployee();
boolean isNewEmployee = existingEmployee != null && !this.equals(existingEmployee);
if (isNewEmployee && existingEmployee.numberOfShifts() <= minimumNumberOfShifts()) {
return wasAdded;
}
if (isNewEmployee) {
aShift.setEmployee(this);
} else {
shifts.add(aShift);
}
wasAdded = true;
return wasAdded;
}
public boolean removeShift(Shift aShift) {
boolean wasRemoved = false;
// Unable to remove aShift, as it must always have a employee
if (this.equals(aShift.getEmployee())) {
return wasRemoved;
}
// employee already at minimum (1)
if (numberOfShifts() <= minimumNumberOfShifts()) {
return wasRemoved;
}
shifts.remove(aShift);
wasRemoved = true;
return wasRemoved;
}