public static BigDecimal calculateFee(
final Period period, final BigDecimal amount, final GuaranteeFeeVO guaranteeFee) {
Amount result = null;
switch (guaranteeFee.getType()) {
case FIXED:
result = Amount.fixed(guaranteeFee.getFee());
// fall down!
case PERCENTAGE:
result = result != null ? result : Amount.percentage(guaranteeFee.getFee());
return result.apply(amount);
case VARIABLE_ACCORDING_TO_TIME: // it's a compound interest calculation
if (period.getBegin().after(period.getEnd())) {
throw new IllegalArgumentException(
"Can't calculate the guarantee fee. Invalid period time: the begin date must be less than the end date");
} else if (amount.doubleValue() == 0d || guaranteeFee.getFee().doubleValue() == 0d) {
return BigDecimal.ZERO;
}
final double periodInDays = DateHelper.daysBetween(period.getBegin(), period.getEnd());
final double pow = periodInDays / 365D;
final double value =
(Math.pow(1 + guaranteeFee.getFee().doubleValue() / 100D, pow) - 1)
* amount.doubleValue();
return new BigDecimal(value);
default:
throw new IllegalArgumentException(
"Can't calculate the guarantee fee: unknown fee type: " + guaranteeFee.getType());
}
}
@Override
public Period clone() {
Period newPeriod;
try {
newPeriod = (Period) super.clone();
} catch (final CloneNotSupportedException e) {
// this should never happen, since it is Cloneable
throw new InternalError(e.getMessage());
}
newPeriod.begin = begin == null ? null : (Calendar) begin.clone();
newPeriod.end = end == null ? null : (Calendar) end.clone();
return newPeriod;
}
