1.1 --- a/task1/solution04/src/org/apidesign/apifest08/currency/CurrencyValues.java	Tue Sep 30 15:17:24 2008 +0200
     1.2 +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.3 @@ -1,122 +0,0 @@
     1.4 -package org.apidesign.apifest08.currency;
     1.5 -
     1.6 -
     1.7 -import java.math.BigDecimal;
     1.8 -import java.util.Currency;
     1.9 -import java.util.HashMap;
    1.10 -import java.util.Map;
    1.11 -import java.util.Timer;
    1.12 -import java.util.TimerTask;
    1.13 -
    1.14 -
    1.15 -/**
    1.16 - * Keeps track of the current value for each currency as USD.  
    1.17 - * 
    1.18 - * @author D'Arcy Smith
    1.19 - * @version 1.0
    1.20 - */
    1.21 -class CurrencyValues
    1.22 -{
    1.23 -    /**
    1.24 -     * The values expressed in USD.
    1.25 -     */
    1.26 -    private static Map<Currency, BigDecimal> values;
    1.27 -    
    1.28 -    /**
    1.29 -     * Update the values periodically
    1.30 -     */
    1.31 -    private static final Timer refresher;
    1.32 -
    1.33 -    static
    1.34 -    {
    1.35 -        final Refresher refresherTask;
    1.36 -        final long delay;
    1.37 -
    1.38 -        // load the map NOW! (don't use the scheduler to do it just because we want
    1.39 -        // to be 100% certain it is loaded before anything else can be called.
    1.40 -        refresh();
    1.41 -
    1.42 -        refresherTask = new Refresher();
    1.43 -        refresher = new Timer("CurrencyValues Refresher", true);
    1.44 -
    1.45 -        // update once an hour
    1.46 -        delay = 1000 * 60 * 60;
    1.47 -        refresher.scheduleAtFixedRate(refresherTask, delay, delay);
    1.48 -    }
    1.49 -    
    1.50 -    /**
    1.51 -     * Prevent accidental creation.
    1.52 -     */
    1.53 -    private CurrencyValues()
    1.54 -    {
    1.55 -    }
    1.56 -        
    1.57 -    /**
    1.58 -     * Refresh the currency values.
    1.59 -     */
    1.60 -    static void refresh()
    1.61 -    {
    1.62 -        Map<Currency, BigDecimal> newValues;    
    1.63 -        Currency                  currency;
    1.64 -        
    1.65 -        newValues = new HashMap<Currency, BigDecimal>();
    1.66 -
    1.67 -        // these would update from a data source, database, web service, something...
    1.68 -        currency = Currency.getInstance("USD");
    1.69 -        newValues.put(currency, BigDecimal.valueOf(1.0).setScale(2));
    1.70 -        
    1.71 -        currency = Currency.getInstance("CZK");
    1.72 -        newValues.put(currency, BigDecimal.valueOf(17.0));
    1.73 -        
    1.74 -        currency = Currency.getInstance("SKK");
    1.75 -        newValues.put(currency, BigDecimal.valueOf(21.25));
    1.76 -        
    1.77 -        // don't sycnhronize all of it because clients can use slightly out of
    1.78 -        // date information.
    1.79 -        synchronized(CurrencyValues.class)
    1.80 -        {
    1.81 -            values = newValues;
    1.82 -        }
    1.83 -    }
    1.84 -
    1.85 -    /**
    1.86 -     * Get the value of the specified currency in USD.
    1.87 -     * 
    1.88 -     * @param currency the corrency to get.
    1.89 -     * @return the value of the currency in USD.
    1.90 -     * @throws IllegalArgumentException if currency is null.
    1.91 -     */
    1.92 -    static BigDecimal getValue(final Currency currency)
    1.93 -    {
    1.94 -        final BigDecimal value;
    1.95 -
    1.96 -        if(currency == null)
    1.97 -        {
    1.98 -            throw new IllegalArgumentException("currencyName cannot be null");
    1.99 -        }
   1.100 -
   1.101 -        // make sure we are not updating the map right now
   1.102 -        synchronized(CurrencyValues.class)
   1.103 -        {
   1.104 -            value = values.get(currency);
   1.105 -        }
   1.106 -
   1.107 -        return (value);
   1.108 -    }
   1.109 -    
   1.110 -    /**
   1.111 -     * Used to update the currency map periodically.
   1.112 -     */
   1.113 -    private static class Refresher
   1.114 -        extends TimerTask
   1.115 -    {
   1.116 -        /**
   1.117 -         * call the refresh method.
   1.118 -         */
   1.119 -        @Override
   1.120 -        public void run() 
   1.121 -        {
   1.122 -            refresh();
   1.123 -        }
   1.124 -    }
   1.125 -}