diff -r 03c5c5dc94e7 -r 58ec6da75f6f task4/solution14/test/org/apidesign/apifest08/test/Task1Test.java
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/task4/solution14/test/org/apidesign/apifest08/test/Task1Test.java Sat Oct 11 23:38:46 2008 +0200
@@ -0,0 +1,144 @@
+package org.apidesign.apifest08.test;
+
+import junit.framework.TestCase;
+import org.apidesign.apifest08.currency.Convertor;
+import org.apidesign.apifest08.currency.ConvertorFactory;
+
+/** Finish the Convertor API, and then write bodies of methods inside
+ * of this class to match the given tasks. To fullfil your task, use the
+ * API define in the org.apidesign.apifest08.currency
package.
+ * Do not you reflection, or other hacks as your code
+ * shall run without any runtime permissions.
+ */
+public class Task1Test extends TestCase {
+ public Task1Test(String testName) {
+ super(testName);
+ }
+
+ @Override
+ protected void setUp() throws Exception {
+ }
+
+ @Override
+ protected void tearDown() throws Exception {
+ }
+
+ //
+ // Imagine 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 design such API
+ //
+
+ /** Create convertor that understands two currencies, CZK and
+ * USD. Make 1 USD == 17 CZK. This is a method provided for #1 group -
+ * e.g. those that know the exchange rate. They somehow need to create
+ * the objects from the API and tell them the exchange rate. The API itself
+ * knows nothing about any rates, before the createCZKtoUSD method is called.
+ *
+ * Creation of the convertor shall not require subclassing of any class
+ * or interface on the client side.
+ *
+ * @return prepared convertor ready for converting USD to CZK and CZK to USD
+ */
+ public static Convertor createCZKtoUSD() {
+ return ConvertorFactory.newInstance().createConvertor("CZK", "USD", 17, 1);
+ }
+
+ /** Create convertor that understands two currencies, CZK and
+ * SKK. Make 100 SKK == 80 CZK. Again this is method for the #1 group -
+ * it 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.
+ *
+ * Creation of the convertor shall not require subclassing of any class
+ * or interface on the client side.
+ *
+ * @return prepared convertor ready for converting SKK to CZK and CZK to SKK
+ */
+ public static Convertor createSKKtoCZK() {
+ return ConvertorFactory.newInstance().createConvertor("SKK", "CZK", 100, 80);
+ }
+
+ //
+ // now the methods for group #2 follow:
+ // this group knows nothing about exchange rates, but knows how to use
+ // the API to do conversions. It somehow (by calling one of the factory
+ // methods) gets objects from the API and uses them to do the conversions.
+ //
+
+ /** Use the convertor from createCZKtoUSD
method and do few conversions
+ * with it.
+ */
+ public void testCurrencyCZKUSD() throws Exception {
+ Convertor c = createCZKtoUSD();
+ // convert $5 to CZK using c:
+ assertEquals("Result is 85 CZK", 85.0, c.convert("USD", "CZK", 5));
+
+ // convert $8 to CZK
+ assertEquals("Result is 136 CZK", 136.0, c.convert("USD", "CZK", 8));
+
+ // convert 1003CZK to USD
+ assertEquals("Result is 59 CZK", 59.0, c.convert("CZK", "USD", 1003));
+ }
+
+ /** Use the convertor from createSKKtoCZK
method and do few conversions
+ * with it.
+ */
+ public void testCurrencySKKCZK() throws Exception {
+ Convertor c = createSKKtoCZK();
+ // convert 16CZK using c:
+ // assertEquals("Result is 20 SKK");
+ assertEquals("Result is 20 SKK", 20.0, c.convert("CZK", "SKK", 16));
+
+ // convert 500SKK to CZK
+ // assertEquals("Result is 400 CZK");
+ assertEquals("Result is 400 SKK", 400.0, c.convert("SKK", "CZK", 500));
+ }
+
+ /** Verify that the CZK to USD convertor knows nothing about SKK.
+ */
+ public void testCannotConvertToSKKwithCZKUSDConvertor() throws Exception {
+ Convertor c = createCZKtoUSD();
+ // convert $5 to SKK, the API shall say this is not possible
+ try {
+ c.convert("USD", "SKK", 5);
+ fail("Converting SKK with CZKUSD convertor is impossible");
+ } catch (IllegalArgumentException e){
+ //ok
+ }
+
+ // convert 500 SKK to CZK, the API shall say this is not possible
+ try {
+ c.convert("SKK", "CZK", 500);
+ fail("Converting SKK with CZKUSD convertor is impossible");
+ } catch (IllegalArgumentException e){
+ //ok
+ }
+
+ }
+
+ /** Verify that the CZK to SKK convertor knows nothing about USD.
+ */
+ public void testCannotConvertToUSDwithCZKSKKConvertor() throws Exception {
+ Convertor c = createSKKtoCZK();
+ // convert $5 to SKK, the API shall say this is not possible
+ try {
+ c.convert("USD", "SKK", 5);
+ fail("Converting SKK with SKKCZK convertor is impossible");
+ } catch (IllegalArgumentException e){
+ //ok
+ }
+
+ // convert 500 CZK to USD, the API shall say this is not possible
+ try {
+ c.convert("CZK", "USD", 500);
+ fail("Converting USD with SKKCZK convertor is impossible");
+ } catch (IllegalArgumentException e){
+ //ok
+ }
+
+ }
+}