package org.apidesign.apifest08.currency;

 import java.math.BigDecimal;

 import java.util.Currency;

 import java.util.Date;

 final class DatedConvertorImpl

     extends    ConvertorImpl

     implements DatedConvertor

 {

     private final DateRange range;

     DatedConvertorImpl(final DateRange rng,

                        final ExchangeRate r)

     {

         super(r);

         if(rng == null)

         {

             throw new IllegalArgumentException("rng cannot be null");

         }

         range = rng;

     }

     public DateRange getDateRange()

     {

         return (range);

     }

     @Override

     public BigDecimal convert(final Currency   from,

                               final Currency   to,

                               final BigDecimal amount)

         throws InvalidConversionException

     {

         final BigDecimal total;

         total = convert(from, to, amount, new Date(System.currentTimeMillis()));

         return (total);

     }

     public BigDecimal convert(final Currency   from,

                               final Currency   to,

                               final BigDecimal amount,

                               final Date       date)

         throws InvalidConversionException

     {

         final BigDecimal total;

         if(range.isInRange(date))

         {

             total = super.convert(from, to, amount);

         }

         else

         {

             throw new InvalidConversionException("cannot convert for date", from);

         }

         return (total);

     }

     public boolean canConvert(final Currency from,

                               final Currency to,

                               final Date     date)

     {

         final boolean retVal;

         if(canConvert(from, to))

         {

             retVal = range.isInRange(date);

         }

         else

         {

             retVal = false;

         }

         return (retVal);

     }

 }