japod@56: package org.apidesign.apifest08.test;
japod@56: 
japod@56: import java.math.BigDecimal;
japod@56: import java.util.Currency;
japod@56: 
japod@56: import org.apidesign.apifest08.currency.ConvertorFactory;
japod@56: import org.apidesign.apifest08.currency.ExtendedConvertor;
japod@56: import org.apidesign.apifest08.currency.Money;
japod@56: import org.apidesign.apifest08.currency.MoneyImpl;
japod@56: 
japod@56: /**
japod@56:  * Third party implementation of the convertor. IT IS NOT THREAD SAFE.
japod@56:  * @author lukas
japod@56:  *
japod@56:  */
japod@56: class OnlineConvertor implements ExtendedConvertor {
japod@56: 	
japod@56: 	private static final BigDecimal LOWER_LIMIT = BigDecimal.valueOf(15);
japod@56: 	private static final BigDecimal HIGHER_LIMIT = BigDecimal.valueOf(16);
japod@56: 	
japod@56: 	private static final Currency USD = Currency.getInstance("USD");
japod@56: 	private static final Currency CZK = Currency.getInstance("CZK");
japod@56: 	private static final MoneyImpl ONE_USD = new MoneyImpl(1,USD);
japod@56: 	
japod@56: 	private ExtendedConvertor wrappedConvertor = ConvertorFactory.createConvertor(ONE_USD, new MoneyImpl(16, CZK));
japod@56: 	
japod@56: 	private BigDecimal increment = new BigDecimal("-0.01");
japod@56: 	
japod@56: 	public boolean isConversionSupported(Currency from, Currency to) {
japod@56: 		return wrappedConvertor.isConversionSupported(from, to);
japod@56: 	}
japod@56: 
japod@56: 	public Money convert(Money amount, Currency destinationCurrency)
japod@56: 			throws IllegalArgumentException {
japod@56: 		Money result = wrappedConvertor.convert(amount, destinationCurrency);
japod@56: 		updateConvertor();
japod@56: 		return result;
japod@56: 	}
japod@56: 
japod@56: 	/**
japod@56: 	 * Prepares convertor for the next conversion.
japod@56: 	 */
japod@56: 	private void updateConvertor() {
japod@56: 		BigDecimal currentRate = wrappedConvertor.convert(ONE_USD, CZK).getAmount();
japod@56: 		BigDecimal newRate = currentRate.add(increment);
japod@56: 		
japod@56: 		if (LOWER_LIMIT.compareTo(newRate)==0 || HIGHER_LIMIT.compareTo(newRate)==0)
japod@56: 		{
japod@56: 			increment = increment.negate();
japod@56: 		}
japod@56: 		wrappedConvertor = ConvertorFactory.createConvertor(ONE_USD, new MoneyImpl(newRate, CZK));
japod@56: 	}
japod@56: 
japod@56: }