1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/task4/solution13/test/org/apidesign/apifest08/test/BouncingExchangeRateEngine.java	Sat Oct 11 23:38:46 2008 +0200
     1.3 @@ -0,0 +1,79 @@
     1.4 +package org.apidesign.apifest08.test;
     1.5 +
     1.6 +import java.math.BigDecimal;
     1.7 +import org.apidesign.apifest08.currency.ConvertorCurrency;
     1.8 +import org.apidesign.apifest08.currency.ExchangeRate;
     1.9 +import org.apidesign.apifest08.currency.IExchangeRateEngine;
    1.10 +
    1.11 +/** Exchange rate engine which is periodicaly changing echange rate.
    1.12 + *  See <a href="http://wiki.apidesign.org/wiki/APIFest08:Task3">http://wiki.apidesign.org/wiki/APIFest08:Task3</a> for further description.
    1.13 + *
    1.14 + * @author arnostvalicek
    1.15 + */
    1.16 +public class BouncingExchangeRateEngine implements IExchangeRateEngine {
    1.17 +    
    1.18 +    ConvertorCurrency fromCurrency;
    1.19 +    BigDecimal fromValue;
    1.20 +    ConvertorCurrency toCurrency;
    1.21 +    BigDecimal toValueStart;
    1.22 +    BigDecimal toValueStop;
    1.23 +    BigDecimal step;
    1.24 +    
    1.25 +    BigDecimal toValue;
    1.26 +
    1.27 +    
    1.28 +    
    1.29 +    
    1.30 +    private BouncingExchangeRateEngine(ConvertorCurrency fromCurrency, BigDecimal fromValue, ConvertorCurrency toCurrency, BigDecimal toValueStart, BigDecimal toValueStop, BigDecimal step) {
    1.31 +        this.fromCurrency = fromCurrency;
    1.32 +        this.fromValue = fromValue;
    1.33 +        this.toCurrency = toCurrency;
    1.34 +        this.toValueStart = toValueStart;
    1.35 +        this.toValueStop = toValueStop;
    1.36 +        this.step = step;
    1.37 +        this.toValue = toValueStart;
    1.38 +    }
    1.39 +
    1.40 +
    1.41 +    public static IExchangeRateEngine create(ConvertorCurrency fromCurrency, BigDecimal fromValue, ConvertorCurrency toCurrency, BigDecimal toValueStart, BigDecimal toValueStop, BigDecimal step) {
    1.42 +        return new BouncingExchangeRateEngine(fromCurrency, fromValue, toCurrency, toValueStart, toValueStop, step);
    1.43 +    }
    1.44 +
    1.45 +    public ExchangeRate getExchangeRate(ConvertorCurrency fromCurrency, ConvertorCurrency toCurrency) {
    1.46 +        if (!fromCurrency.equals(this.fromCurrency)) {
    1.47 +            return null;
    1.48 +        }
    1.49 +        if (!toCurrency.equals(this.toCurrency)) {
    1.50 +            return null;
    1.51 +        }
    1.52 +        
    1.53 +        ExchangeRate result = new ExchangeRate(fromValue, toValue);
    1.54 +        
    1.55 +        toValue = toValue.add(step);
    1.56 +        
    1.57 +//        if (step.signum()==1 && toValueStop.compareTo(toValue)==0) {
    1.58 +//            System.out.println("A");
    1.59 +//            toValue=toValueStop;
    1.60 +//            step = step.negate();
    1.61 +//            BigDecimal x = toValueStart;
    1.62 +//            toValueStart=toValueStop;
    1.63 +//            toValueStop=x;
    1.64 +//        } else if (step.signum()==-1 && toValueStop.compareTo(toValue)==0) {
    1.65 +//            System.out.println("B");
    1.66 +//            toValue=toValueStop;
    1.67 +//            step = step.negate();
    1.68 +//            BigDecimal x = toValueStart;
    1.69 +//            toValueStart=toValueStop;
    1.70 +//            toValueStop=x;
    1.71 +//        }
    1.72 +        if (toValueStop.compareTo(toValue)==0) {
    1.73 +            toValue=toValueStop;
    1.74 +            step = step.negate();
    1.75 +            BigDecimal x = toValueStart;
    1.76 +            toValueStart=toValueStop;
    1.77 +            toValueStop=x;
    1.78 +        }        
    1.79 +        return result;
    1.80 +    }
    1.81 +
    1.82 +}