diff -r 251d0ed461fb -r 58ec6da75f6f task4/solution04/test/org/apidesign/apifest08/test/Task2Test.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/task4/solution04/test/org/apidesign/apifest08/test/Task2Test.java Sat Oct 11 23:38:46 2008 +0200 @@ -0,0 +1,179 @@ +package org.apidesign.apifest08.test; + +import java.math.BigDecimal; +import java.util.Currency; +import java.util.Set; +import junit.framework.TestCase; +import org.apidesign.apifest08.currency.Convertor; +import org.apidesign.apifest08.currency.ConvertorFactory; +import org.apidesign.apifest08.currency.InvalidConversionException; + + +/** There are many currencies around the world and many banks manipulate + * with more than one or two at the same time. As banks are usually the + * best paying clients, which is true even in case of your Convertor API, + * it is reasonable to listen to their requests. + *
+ * The quest for today is to enhance your existing convertor API to hold
+ * information about many currencies and allow conversions between any of them.
+ * Also, as conversion rates for diferent currencies usually arise from various
+ * bank departments, there is another important need. There is a need to
+ * compose two convertors into one by merging all the information about
+ * currencies they know about.
+ */
+public class Task2Test extends TestCase
+{
+ private final static Currency CZK;
+ private final static Currency SKK;
+ private final static Currency USD;
+
+ static
+ {
+ CZK = Currency.getInstance("CZK");
+ SKK = Currency.getInstance("SKK");
+ USD = Currency.getInstance("USD");
+ }
+
+ public Task2Test(String testName)
+ {
+ super(testName);
+ }
+
+ @Override
+ protected void setUp()
+ throws Exception
+ {
+ }
+
+ @Override
+ protected void tearDown()
+ throws Exception
+ {
+ }
+
+ // As in Task1Test, keep in mind, that there are three parts
+ // of the whole system:
+ // 1. there is someone who knows the current exchange rate
+ // 2. there is someone who wants to do the conversion
+ // 3. there is the API between 1. and 2. which allows them to communicate
+ //
+ // Please backward compatibly enhance your existing API to support following
+ // usecases:
+ //
+
+ /** Create convertor that understands two currencies, CZK and
+ * SKK. Make 100 SKK == 75 CZK. This is method for the group of users that
+ * knows the exchange rate, and needs to use the API to create objects
+ * with the exchange rate. Anyone shall be ready to call this method without
+ * any other method being called previously. The API itself shall know
+ * nothing about any rates, before this method is called.
+ */
+ public static Convertor createTripleConvertor() {
+ // Rates: 1USD = 15CZK
+ // Rates: 1USD = 20SKK
+ // Rates: 75CZK = 100SKK
+ Convertor c = ConvertorFactory.mergeConvertors(
+ ConvertorFactory.getConvertor(USD, BigDecimal.ONE, CZK, BigDecimal.valueOf(15.00)),
+ ConvertorFactory.getConvertor(USD, BigDecimal.ONE, SKK, BigDecimal.valueOf(20.00))
+ );
+
+ return c;
+ }
+
+ /** Define convertor that understands three currencies. Use it.
+ */
+ public void testConvertorForUSDandCZKandSKK() throws Exception {
+ Convertor c = createTripleConvertor();
+
+ // convert $5 to CZK using c:
+ // assertEquals("Result is 75 CZK");
+ assertEquals(new BigDecimal("75.00"), c.convert(USD, CZK, BigDecimal.valueOf(5.00)));
+
+ // convert $5 to SKK using c:
+ // assertEquals("Result is 100 SKK");
+ assertEquals(new BigDecimal("100.00"), c.convert(USD, SKK, BigDecimal.valueOf(5.00)));
+
+ // convert 200SKK to CZK using c:
+ // assertEquals("Result is 150 CZK");
+ assertEquals(new BigDecimal("150.00"), c.convert(SKK, CZK, BigDecimal.valueOf(200.00)));
+
+ // convert 200SKK to USK using c:
+ // assertEquals("Result is 10 USD");
+ assertEquals(new BigDecimal("10.00"), c.convert(SKK, USD, BigDecimal.valueOf(200.00)));
+ }
+
+ /** Merge all currency rates of convertor 1 with convertor 2.
+ * Implement this using your API, preferably this method just delegates
+ * into some API method which does the actual work, without requiring
+ * API clients to code anything complex.
+ */
+ public static Convertor merge(Convertor one, Convertor two) {
+ return ConvertorFactory.mergeConvertors(one, two);
+ }
+
+ /** Join the convertors from previous task, Task1Test and show that it
+ * can be used to do reasonable conversions.
+ */
+ public void testConvertorComposition() throws Exception {
+ Convertor c = merge(
+ Task1Test.createCZKtoUSD(),
+ Task1Test.createSKKtoCZK()
+ );
+
+ // convert $5 to CZK using c:
+ // assertEquals("Result is 85 CZK");
+ assertEquals(new BigDecimal("85.00"), c.convert(USD, CZK, BigDecimal.valueOf(5.00)));
+
+ // convert $8 to CZK using c:
+ // assertEquals("Result is 136 CZK");
+ assertEquals(new BigDecimal("136.00"), c.convert(USD, CZK, BigDecimal.valueOf(8.00)));
+
+ // convert 1003CZK to USD using c:
+ // assertEquals("Result is 59 USD");
+ assertEquals(new BigDecimal("59.00"), c.convert(CZK, USD, BigDecimal.valueOf(1003.00)));
+
+ // convert 16CZK using c:
+ // assertEquals("Result is 20 SKK");
+ assertEquals(new BigDecimal("20.00"), c.convert(CZK, SKK, BigDecimal.valueOf(16.00)));
+
+ // convert 500SKK to CZK using c:
+ // assertEquals("Result is 400 CZK");
+ assertEquals(new BigDecimal("400.00"), c.convert(SKK, CZK, BigDecimal.valueOf(500.00)));
+ }
+
+ public void testGetCurrencies()
+ {
+ Convertor c = merge(
+ Task1Test.createCZKtoUSD(),
+ Task1Test.createSKKtoCZK()
+ );
+ Set