package org.apidesign.apifest08.currency;

import java.util.Date;

/**

 * Interface for exchange rate engine using dates.

 * 

 * @author arnostvalicek

 */

public interface IDateExchangeRateEngine {

    /**

     * Get exchange rate for conversion from <code>fromCurrency</code> to <code>toCurrency</code> at <code>date</code>.

     * 

     * @param fromCurrency From currency.

     * @param toCurrency To currency.

     * @param date Conversion date.

     * @return Returns <code>ExchangeRate</code> if exchange rate is known or <code>null</code> if exchanger rate is not known.

     */

    public ExchangeRate getExchangeRate(ConvertorCurrency fromCurrency, ConvertorCurrency toCurrency, Date date);

}