1.1 --- a/task4/solution12/test/org/apidesign/apifest08/test/Task2Test.java Fri Oct 17 17:54:38 2008 +0200
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,132 +0,0 @@
1.4 -package org.apidesign.apifest08.test;
1.5 -
1.6 -import java.util.Currency;
1.7 -
1.8 -import junit.framework.TestCase;
1.9 -
1.10 -import org.apidesign.apifest08.currency.Convertor;
1.11 -import org.apidesign.apifest08.currency.exceptions.UnknownConvertorException;
1.12 -
1.13 -/** There are many currencies around the world and many banks manipulate
1.14 - * with more than one or two at the same time. As banks are usually the
1.15 - * best paying clients, which is true even in case of your Convertor API,
1.16 - * it is reasonable to listen to their requests.
1.17 - * <p>
1.18 - * The quest for today is to enhance your existing convertor API to hold
1.19 - * information about many currencies and allow conversions between any of them.
1.20 - * Also, as conversion rates for diferent currencies usually arise from various
1.21 - * bank departments, there is another important need. There is a need to
1.22 - * compose two convertors into one by merging all the information about
1.23 - * currencies they know about.
1.24 - */
1.25 -public class Task2Test extends TestCase {
1.26 - public Task2Test(String testName) {
1.27 - super(testName);
1.28 - }
1.29 -
1.30 - @Override
1.31 - protected void setUp() throws Exception {
1.32 - }
1.33 -
1.34 - @Override
1.35 - protected void tearDown() throws Exception {
1.36 - }
1.37 -
1.38 - // As in Task1Test, keep in mind, that there are three parts
1.39 - // of the whole system:
1.40 - // 1. there is someone who knows the current exchange rate
1.41 - // 2. there is someone who wants to do the conversion
1.42 - // 3. there is the API between 1. and 2. which allows them to communicate
1.43 - //
1.44 - // Please backward compatibly enhance your existing API to support following
1.45 - // usecases:
1.46 - //
1.47 -
1.48 - /** Create convertor that understands two currencies, CZK and
1.49 - * SKK. Make 100 SKK == 75 CZK. This is method for the group of users that
1.50 - * knows the exchange rate, and needs to use the API to create objects
1.51 - * with the exchange rate. Anyone shall be ready to call this method without
1.52 - * any other method being called previously. The API itself shall know
1.53 - * nothing about any rates, before this method is called.
1.54 - */
1.55 - public static Convertor createTripleConvertor() {
1.56 - // Rates: 1USD = 15CZK
1.57 - // Rates: 1USD = 20SKK
1.58 - // Rates: 75CZK = 100SKK
1.59 - // set exchange rates
1.60 - Convertor.setConvertorRates(Currency.getInstance("USD"), Currency.getInstance("CZK"), 15, 1);
1.61 - Convertor.setConvertorRates(Currency.getInstance("USD"), Currency.getInstance("SKK"), 20, 1);
1.62 - Convertor.setConvertorRates(Currency.getInstance("SKK"), Currency.getInstance("CZK"), 75, 100);
1.63 -
1.64 - // create new instance
1.65 - Convertor convertor = null;
1.66 - try {
1.67 - convertor = Convertor.getConvertorInstance(Currency.getInstance("USD"), Currency.getInstance("SKK"), Currency.getInstance("CZK"));
1.68 - } catch (UnknownConvertorException e) {
1.69 - e.printStackTrace();
1.70 - }
1.71 - return convertor;
1.72 - }
1.73 -
1.74 - /** Define convertor that understands three currencies. Use it.
1.75 - */
1.76 - public void testConvertorForUSDandCZKandSKK() throws Exception {
1.77 - Convertor c = createTripleConvertor();
1.78 -
1.79 - // convert $5 to CZK using c:
1.80 - double result = c.convert(5d, Currency.getInstance("USD"), Currency.getInstance("CZK"));
1.81 - assertEquals("Result is not 75 CZK", 75.0, result);
1.82 -
1.83 - // convert $5 to SKK using c:
1.84 - result = c.convert(5d, Currency.getInstance("USD"), Currency.getInstance("SKK"));
1.85 - assertEquals("Result is not 100 SKK", 100.0, result);
1.86 -
1.87 - // convert 200SKK to CZK using c:
1.88 - result = c.convert(200d, Currency.getInstance("SKK"), Currency.getInstance("CZK"));
1.89 - assertEquals("Result is not 150 CZK", 150.0, result);
1.90 -
1.91 - // convert 200SKK to USK using c:
1.92 - result = c.convert(200d, Currency.getInstance("SKK"), Currency.getInstance("USD"));
1.93 - assertEquals("Result is not 10 USD", 10.0, result);
1.94 - }
1.95 -
1.96 - /** Merge all currency rates of convertor 1 with convertor 2.
1.97 - * Implement this using your API, preferably this method just delegates
1.98 - * into some API method which does the actual work, without requiring
1.99 - * API clients to code anything complex.
1.100 - */
1.101 - public static Convertor merge(Convertor one, Convertor two) {
1.102 - return one.merge(two);
1.103 - }
1.104 -
1.105 - /** Join the convertors from previous task, Task1Test and show that it
1.106 - * can be used to do reasonable conversions.
1.107 - */
1.108 - public void testConvertorComposition() throws Exception {
1.109 - Convertor c = merge(
1.110 - Task1Test.createCZKtoUSD(),
1.111 - Task1Test.createSKKtoCZK()
1.112 - );
1.113 -
1.114 - // convert $5 to CZK using c:
1.115 - double result = c.convert(5d, Currency.getInstance("USD"), Currency.getInstance("CZK"));
1.116 - assertEquals("Result is not 85 CZK", 85.0, result);
1.117 -
1.118 - // convert $8 to CZK using c:
1.119 - result = c.convert(8d, Currency.getInstance("USD"), Currency.getInstance("CZK"));
1.120 - assertEquals("Result is not 136 CZK", 136.0, result);
1.121 -
1.122 - // convert 1003CZK to USD using c:
1.123 - result = c.convert(1003d, Currency.getInstance("CZK"), Currency.getInstance("USD"));
1.124 - assertEquals("Result is not 59 USD", 59.0, result);
1.125 -
1.126 - // convert 16CZK using c:
1.127 - result = c.convert(16d, Currency.getInstance("CZK"), Currency.getInstance("SKK"));
1.128 - assertEquals("Result is not 20 SKK", 20.0, result);
1.129 -
1.130 - // convert 500SKK to CZK using c:
1.131 - result = c.convert(500d, Currency.getInstance("SKK"), Currency.getInstance("CZK"));
1.132 - assertEquals("Result is not 400 CZK", 400.0, result);
1.133 -
1.134 - }
1.135 -}