1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/task2/solution01/src/org/apidesign/apifest08/currency/ConvertorsFactory.java	Wed Oct 01 10:43:05 2008 +0200
     1.3 @@ -0,0 +1,43 @@
     1.4 +package org.apidesign.apifest08.currency;
     1.5 +
     1.6 +/**
     1.7 + * Some Factory for Factories :-)
     1.8 + * Depends on the whole application design...
     1.9 + * @author Ladislav Vitasek
    1.10 + */
    1.11 +final public class ConvertorsFactory {
    1.12 +    private CurrencyConvertorFactory currencyConvertorFactoryInstance = null;
    1.13 +    private final static ConvertorsFactory instance = new ConvertorsFactory();
    1.14 +
    1.15 +
    1.16 +    private ConvertorsFactory() {
    1.17 +
    1.18 +    }
    1.19 +
    1.20 +    public static CurrencyConvertorFactory getCurrencyConvertorFactoryInstance() throws CannotInstantiateFactoryException {
    1.21 +        return getInstance().getCurrencyConvertor();
    1.22 +    }
    1.23 +
    1.24 +    /**
    1.25 +     * Returns instance of CurrencyConvertorFactory 
    1.26 +     * @return new instance of CurrencyConvertorFactory
    1.27 +     * @throws CannotInstantiateFactoryException
    1.28 +     */
    1.29 +    private synchronized CurrencyConvertorFactory getCurrencyConvertor() throws CannotInstantiateFactoryException {
    1.30 +        if (currencyConvertorFactoryInstance == null) {//intern implementation
    1.31 +//            String className = System.getProperty("currencyFactory", CurrencyConvertorFactoryImpl.class.getName());
    1.32 +//            try {
    1.33 +//                currencyConvertorFactoryInstance = (CurrencyConvertorFactory) Class.forName(className).newInstance();
    1.34 +//            } catch (Exception e) {
    1.35 +//                throw new CannotInstantiateFactoryException(e);
    1.36 +//            }
    1.37 +            //without reflection
    1.38 +            currencyConvertorFactoryInstance = new CurrencyConvertorFactoryImpl();
    1.39 +        }
    1.40 +        return currencyConvertorFactoryInstance;
    1.41 +    }
    1.42 +
    1.43 +    public static ConvertorsFactory getInstance() {
    1.44 +        return instance;
    1.45 +    }
    1.46 +}