private Integer getSumOwed() {
Integer sumOwed = 0;
for (Balance creditor : self.creditors()) {
sumOwed += creditor.getBalance() < 0 ? -creditor.getBalance() : 0;
}
return sumOwed;
}
public List<Balance> getCreditors() {
return self.creditors().toList();
}
public Balance getAccount(String accountId) {
return self.getAccount(accountId);
}