1.1 --- a/task2/solution04/src/org/apidesign/apifest08/currency/Convertor.java	Wed Oct 01 10:43:05 2008 +0200
     1.2 +++ b/task2/solution04/src/org/apidesign/apifest08/currency/Convertor.java	Tue Oct 07 00:21:03 2008 +0200
     1.3 @@ -3,6 +3,7 @@
     1.4  
     1.5  import java.math.BigDecimal;
     1.6  import java.util.Currency;
     1.7 +import java.util.Set;
     1.8  
     1.9  
    1.10  /**
    1.11 @@ -27,4 +28,32 @@
    1.12                         Currency   to, 
    1.13                         BigDecimal amount)
    1.14          throws InvalidConversionException;
    1.15 +
    1.16 +    /**
    1.17 +     * Check to see if converting between the two currencies is possible.
    1.18 +     *
    1.19 +     * @param from the currency to convert from.
    1.20 +     * @param to the currency to convert to.
    1.21 +     * @return true if the conversion is possible.
    1.22 +     */
    1.23 +    boolean canConvert(Currency from, Currency to);
    1.24 +
    1.25 +    /**
    1.26 +     * Get the currencies that the convertor supports.  Just because a currency is
    1.27 +     * supported does not mean that canConvert will return true.
    1.28 +     * 
    1.29 +     * @return the supported currencies.
    1.30 +     */
    1.31 +    Set<Currency> getCurrencies();
    1.32 +
    1.33 +    /**
    1.34 +     * Get the conversion rate between two currencies.
    1.35 +     * 
    1.36 +     * @param from the currency to convert from.
    1.37 +     * @param to the currency to convert to.
    1.38 +     * @return the conversion rate between the two currencies.
    1.39 +     * @throws InvalidConversionException if canConvert would return false.
    1.40 +     */
    1.41 +    BigDecimal getConversionRate(final Currency from, final Currency to)
    1.42 +        throws InvalidConversionException;
    1.43  }