TransactionProcessor.java

public void processSales(List<Sale> sales, Customer customer) {
boolean foreignCurrencyFound = false;
List<Transaction> transactions = new LinkedList<Transaction>();
for (Sale sale : sales) {
    Transaction transaction = createTransaction(sale, customer);
    transactions.add(transaction);
    if (!foreignCurrencyFound && isInForeignCurrency(transaction))
        foreignCurrencyFound = true;
}
if (foreignCurrencyFound) 
    notifyForeignOffice(customer);
saveInDatabase(transactions);
}