1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/task2/solution14/src/org/apidesign/apifest08/currency/Convertor.java	Wed Oct 01 10:43:05 2008 +0200
     1.3 @@ -0,0 +1,88 @@
     1.4 +package org.apidesign.apifest08.currency;
     1.5 +
     1.6 +/** This is the skeleton class for your API. You need to make it public, so
     1.7 + * it is accessible to your client code (currently in Task1Test.java) file.
     1.8 + * <p>
     1.9 + * Feel free to create additional classes or rename this one, just keep all
    1.10 + * the API and its implementation in this package. Do not spread it outside
    1.11 + * to other packages.
    1.12 + */
    1.13 +public final class Convertor {
    1.14 +    private String currency1;
    1.15 +    private String currency2;
    1.16 +    private Rate rate;
    1.17 +    
    1.18 +    Convertor(String currency1, String currency2, Rate rate) {
    1.19 +        if ((currency1 == null)||(currency2 == null)||(rate == null)) {
    1.20 +            throw new IllegalArgumentException("All arguments have to be non-null.");
    1.21 +        }
    1.22 +        this.currency1 = currency1;
    1.23 +        this.currency2 = currency2;
    1.24 +        this.rate = rate;
    1.25 +    }
    1.26 +
    1.27 +    public double convert(String fromCurrency, String toCurrency, int amount) {
    1.28 +        if ((fromCurrency == null)||(toCurrency == null)) {
    1.29 +            throw new IllegalArgumentException("All arguments have to be non-null.");            
    1.30 +        }
    1.31 +        
    1.32 +        if (currency1.equals(fromCurrency) && currency2.equals(toCurrency)) {
    1.33 +            return rate.convertAtoB(amount);
    1.34 +        } else if (currency2.equals(fromCurrency) && currency1.equals(toCurrency)) {
    1.35 +            return rate.convertBtoA(amount);
    1.36 +        } else {
    1.37 +            throw new IllegalArgumentException("Convertor " + this.toString() + 
    1.38 +                    " cannot work with currencies " + fromCurrency + " and " + toCurrency + ".");
    1.39 +        }
    1.40 +    }
    1.41 +
    1.42 +    public double convert(String fromCurrency, String toCurrency, double amount) {
    1.43 +        if ((fromCurrency == null)||(toCurrency == null)) {
    1.44 +            throw new IllegalArgumentException("All arguments have to be non-null.");            
    1.45 +        }
    1.46 +        
    1.47 +        if (currency1.equals(fromCurrency) && currency2.equals(toCurrency)) {
    1.48 +            return rate.convertAtoB(amount);
    1.49 +        } else if (currency2.equals(fromCurrency) && currency1.equals(toCurrency)) {
    1.50 +            return rate.convertBtoA(amount);
    1.51 +        } else {
    1.52 +            throw new IllegalArgumentException("Convertor " + this.toString() + 
    1.53 +                    " cannot work with currencies " + fromCurrency + " and " + toCurrency + ".");
    1.54 +        }
    1.55 +    }
    1.56 +        
    1.57 +    @Override
    1.58 +    public String toString() {
    1.59 +        return currency1+currency2;
    1.60 +    }
    1.61 +    
    1.62 +    @Override
    1.63 +    public boolean equals(Object obj) {
    1.64 +        if (obj == null) {
    1.65 +            return false;
    1.66 +        }
    1.67 +        if (getClass() != obj.getClass()) {
    1.68 +            return false;
    1.69 +        }
    1.70 +        final Convertor other = (Convertor) obj;
    1.71 +        if (this.currency1 != other.currency1 && (this.currency1 == null || !this.currency1.equals(other.currency1))) {
    1.72 +            return false;
    1.73 +        }
    1.74 +        if (this.currency2 != other.currency2 && (this.currency2 == null || !this.currency2.equals(other.currency2))) {
    1.75 +            return false;
    1.76 +        }
    1.77 +        if (this.rate != other.rate && (this.rate == null || !this.rate.equals(other.rate))) {
    1.78 +            return false;
    1.79 +        }
    1.80 +        return true;
    1.81 +    }
    1.82 +
    1.83 +    @Override
    1.84 +    public int hashCode() {
    1.85 +        int hash = 5;
    1.86 +        hash = 67 * hash + (this.currency1 != null ? this.currency1.hashCode() : 0);
    1.87 +        hash = 67 * hash + (this.currency2 != null ? this.currency2.hashCode() : 0);
    1.88 +        hash = 67 * hash + (this.rate != null ? this.rate.hashCode() : 0);
    1.89 +        return hash;
    1.90 +    }
    1.91 +}