1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/currency/test/org/apidesign/apifest08/test/Task4Test.java Sat Oct 11 23:36:46 2008 +0200
1.3 @@ -0,0 +1,132 @@
1.4 +package org.apidesign.apifest08.test;
1.5 +
1.6 +import java.util.Date;
1.7 +import junit.framework.TestCase;
1.8 +import org.apidesign.apifest08.currency.Convertor;
1.9 +
1.10 +/** The exchange rates are not always the same. They are changing. However
1.11 + * as in order to predict the future, one needs to understand own past. That is
1.12 + * why it is important to know the exchange rate as it was at any time during
1.13 + * the past.
1.14 + * <p>
1.15 + * Today's quest is to enhance the convertor API to deal with dates.
1.16 + * One shall be able to convert a currency at any date. Each currencies rate shall
1.17 + * be associated with a range between two Date objects. In order
1.18 + * to keep compatibility with old API that knew nothing about dates, the
1.19 + * rates associated then are applicable "for eternity". Any use of existing
1.20 + * convert methods that do not accept a Date argument, uses the current
1.21 + * System.currentTimeMillis() as default date.
1.22 + */
1.23 +public class Task4Test extends TestCase {
1.24 + public Task4Test(String testName) {
1.25 + super(testName);
1.26 + }
1.27 +
1.28 + @Override
1.29 + protected void setUp() throws Exception {
1.30 + }
1.31 +
1.32 + @Override
1.33 + protected void tearDown() throws Exception {
1.34 + }
1.35 +
1.36 + // Backward compatibly enhance your existing API to support following
1.37 + // usecases:
1.38 + //
1.39 +
1.40 + /** Takes a convertor with any rates associated and creates new convertor
1.41 + * that returns the same values as the old one for time between from to till.
1.42 + * Otherwise it returns no results. This is just a helper method that
1.43 + * shall call some real one in the API.
1.44 + *
1.45 + * @param old existing convertor
1.46 + * @param from initial date (inclusive)
1.47 + * @param till final date (exclusive)
1.48 + * @return new convertor
1.49 + */
1.50 + public static Convertor limitTo(Convertor old, Date from, Date till) {
1.51 + return null;
1.52 + }
1.53 +
1.54 +
1.55 + public void testCompositionOfLimitedConvertors() throws Exception {
1.56 + if (Boolean.getBoolean("ignore.failing")) {
1.57 + // implement me! then delete this if statement
1.58 + return;
1.59 + }
1.60 +
1.61 + Date d1 = null; // 2008-10-01 0:00 GMT
1.62 + Date d2 = null; // 2008-10-02 0:00 GMT
1.63 + Date d3 = null; // 2008-10-03 0:00 GMT
1.64 +
1.65 + Convertor c = Task2Test.merge(
1.66 + limitTo(Task1Test.createCZKtoUSD(), d1, d2),
1.67 + limitTo(Task1Test.createSKKtoCZK(), d2, d3)
1.68 + );
1.69 +
1.70 + // convert $5 to CZK using c:
1.71 + // cannot convert as no rate is applicable to current date
1.72 +
1.73 + // convert $8 to CZK using c:
1.74 + // cannot convert as no rate is applicable to current date
1.75 +
1.76 + // convert 1003CZK to USD using c:
1.77 + // cannot convert as no rate is applicable to current date
1.78 +
1.79 + // convert 16CZK using c:
1.80 + // cannot convert as no rate is applicable to current date
1.81 +
1.82 + // convert 500SKK to CZK using c:
1.83 + // cannot convert as no rate is applicable to current date
1.84 +
1.85 + // convert $5 to CZK using c at 2008-10-01 6:00 GMT:
1.86 + // assertEquals("Result is 85 CZK");
1.87 +
1.88 + // convert $8 to CZK using c at 2008-10-01 6:00 GMT:
1.89 + // assertEquals("Result is 136 CZK");
1.90 +
1.91 + // convert 1003CZK to USD using c at 2008-10-01 6:00 GMT:
1.92 + // assertEquals("Result is 59 USD");
1.93 +
1.94 + // convert 16CZK using c at 2008-10-02 9:00 GMT:
1.95 + // assertEquals("Result is 20 SKK");
1.96 +
1.97 + // convert 500SKK to CZK using c at 2008-10-02 9:00 GMT:
1.98 + // assertEquals("Result is 400 CZK");
1.99 +
1.100 + // convert 500SKK to CZK using c at 2008-10-01 6:00 GMT:
1.101 + // cannot convert as no rate is applicable to current date
1.102 + }
1.103 +
1.104 + /** Create convertor that understands two currencies, CZK and
1.105 + * SKK. Make 100 SKK == 90 CZK.
1.106 + *
1.107 + * @return prepared convertor ready for converting SKK to CZK and CZK to SKK
1.108 + */
1.109 + public static Convertor createSKKtoCZK2() {
1.110 + return null;
1.111 + }
1.112 +
1.113 + public void testDateConvetorWithTwoDifferentRates() throws Exception {
1.114 + if (Boolean.getBoolean("ignore.failing")) {
1.115 + // implement me! then delete this if statement
1.116 + return;
1.117 + }
1.118 +
1.119 + Date d1 = null; // 2008-10-01 0:00 GMT
1.120 + Date d2 = null; // 2008-10-02 0:00 GMT
1.121 + Date d3 = null; // 2008-10-03 0:00 GMT
1.122 +
1.123 + Convertor c = Task2Test.merge(
1.124 + limitTo(createSKKtoCZK2(), d1, d2),
1.125 + limitTo(Task1Test.createSKKtoCZK(), d2, d3)
1.126 + );
1.127 +
1.128 + // convert 500SKK to CZK using c at 2008-10-02 9:00 GMT:
1.129 + // assertEquals("Result is 400 CZK");
1.130 +
1.131 + // convert 500SKK to CZK using c at 2008-10-01 6:00 GMT:
1.132 + // assertEquals("Result is 450 CZK");
1.133 + }
1.134 +
1.135 +}