public Builder withBid(BigDecimal rate, BigDecimal amount) {
bids.add(new Offer(OfferType.bid, rate, new CurrencyValue(symbol.sourceCurrency(), amount)));
return this;
}
public Builder withAsk(BigDecimal rate, BigDecimal amount) {
asks.add(new Offer(OfferType.ask, rate, new CurrencyValue(symbol.sourceCurrency(), amount)));
return this;
}