1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/task2/solution05/src/org/apidesign/apifest08/currency/ConvertorFactory.java	Wed Oct 01 10:43:05 2008 +0200
     1.3 @@ -0,0 +1,30 @@
     1.4 +package org.apidesign.apifest08.currency;
     1.5 +
     1.6 +/**
     1.7 + * Convertor factory is a factory class for creating {@link Convertor Convertor}
     1.8 + * instances.
     1.9 + *
    1.10 + * @author jindra
    1.11 + */
    1.12 +public final class ConvertorFactory {
    1.13 +
    1.14 +    // this class needs no instances
    1.15 +    private ConvertorFactory() {
    1.16 +    }
    1.17 +
    1.18 +
    1.19 +    /**
    1.20 +     * Create a {@link Convertor Convertor} with given exchange rate
    1.21 +     *
    1.22 +     * @param exchangeRate double reprezenting the exchange rate from primary currency into
    1.23 +     * the secundary currecny
    1.24 +     * @return {@link Convertor Convertor} instance with given exchange rate
    1.25 +     */
    1.26 +    public static Convertor createConvertor(double exchangeRate) {
    1.27 +        if (exchangeRate == 0) {
    1.28 +            throw new IllegalArgumentException("Zero exchange rate is not allowed.");
    1.29 +        }
    1.30 +        return new ConvertorImpl(exchangeRate);
    1.31 +
    1.32 +    }
    1.33 +}