@Override
public boolean accept(RomanNumber input) {
if (previousNumber == null) {
previousNumber = input;
subtracted = false;
return true;
}
if (!subtracted && previousNumber.getValue() >= input.getValue()) {
previousNumber = input;
subtracted = false;
return true;
}
if (!subtracted && previousNumber.getValue() < input.getValue()) {
if (SUBTRACTABLE.get(previousNumber).contains(input)) {
previousNumber = input;
subtracted = true;
return true;
} else {
previousNumber = input;
subtracted = false;
return false;
}
}
if (subtracted && previousNumber.getValue() > input.getValue()) {
previousNumber = input;
subtracted = false;
return true;
}
if (subtracted && previousNumber.getValue() <= input.getValue()) {
previousNumber = input;
subtracted = true;
return false;
}
return false;
}
