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package org.apidesign.apifest08.test;
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import java.util.Date;
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import java.util.GregorianCalendar;
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import junit.framework.TestCase;
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import org.apidesign.apifest08.currency.Convertor;
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import org.apidesign.apifest08.currency.ConvertorFactory;
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/** The exchange rates are not always the same. They are changing. However
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* as in order to predict the future, one needs to understand own past. That is
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* why it is important to know the exchange rate as it was at any time during
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* the past.
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* <p>
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* Today's quest is to enhance the convertor API to deal with dates.
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* One shall be able to convert a currency at any date. Each currencies rate shall
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* be associated with a range between two Date objects. In order
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* to keep compatibility with old API that knew nothing about dates, the
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* rates associated then are applicable "for eternity". Any use of existing
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* convert methods that do not accept a Date argument, uses the current
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* System.currentTimeMillis() as default date.
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*/
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public class Task4Test extends TestCase {
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public Task4Test(String testName) {
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super(testName);
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}
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@Override
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protected void setUp() throws Exception {
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}
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@Override
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protected void tearDown() throws Exception {
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}
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// Backward compatibly enhance your existing API to support following
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// usecases:
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//
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/** Takes a convertor with any rates associated and creates new convertor
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* that returns the same values as the old one for time between from to till.
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* Otherwise it returns no results. This is just a helper method that
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* shall call some real one in the API.
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*
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* @param old existing convertor
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* @param from initial date (inclusive)
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* @param till final date (exclusive)
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* @return new convertor
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*/
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public static Convertor limitTo(Convertor old, Date from, Date till) {
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return ConvertorFactory.newInstance().limitConvertor(old, from, till);
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}
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public void testCompositionOfLimitedConvertors() throws Exception {
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Date d1 = (new GregorianCalendar(2008, 9, 1, 0, 0)).getTime(); // 2008-10-01 0:00 GMT
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Date d2 = (new GregorianCalendar(2008, 9, 2, 0, 0)).getTime(); // 2008-10-02 0:00 GMT
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Date d3 = (new GregorianCalendar(2008, 9, 3, 0, 0)).getTime(); // 2008-10-03 0:00 GMT
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Convertor c = Task2Test.merge(
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limitTo(Task1Test.createCZKtoUSD(), d1, d2),
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limitTo(Task1Test.createSKKtoCZK(), d2, d3)
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);
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// convert $5 to CZK using c:
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// cannot convert as no rate is applicable to current date
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try {
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c.convert("USD", "CZK", 5);
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fail();
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} catch (IllegalArgumentException e) {
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//ok
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}
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// convert $8 to CZK using c:
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// cannot convert as no rate is applicable to current date
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try {
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c.convert("USD", "CZK", 8);
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fail();
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} catch (IllegalArgumentException e) {
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//ok
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}
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// convert 1003CZK to USD using c:
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// cannot convert as no rate is applicable to current date
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try {
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c.convert("CZK", "USD", 1003);
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fail();
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} catch (IllegalArgumentException e) {
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//ok
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}
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// convert 16CZK using c:
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// cannot convert as no rate is applicable to current date
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try {
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c.convert("CZK", "USD", 16);
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fail();
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} catch (IllegalArgumentException e) {
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//ok
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}
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// convert 500SKK to CZK using c:
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// cannot convert as no rate is applicable to current date
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try {
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c.convert("SKK", "CZK", 500);
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fail();
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} catch (IllegalArgumentException e) {
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//ok
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}
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// convert $5 to CZK using c at 2008-10-01 6:00 GMT:
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// assertEquals("Result is 85 CZK");
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assertEquals("Result is 85 CZK", 85.0, c.convert("USD", "CZK", 5, (new GregorianCalendar(2008,9,1,6,0)).getTime()));
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// convert $8 to CZK using c at 2008-10-01 6:00 GMT:
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// assertEquals("Result is 136 CZK");
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assertEquals("Result is 136 CZK", 136.0, c.convert("USD", "CZK", 8, (new GregorianCalendar(2008,9,1,6,0)).getTime()));
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// convert 1003CZK to USD using c at 2008-10-01 6:00 GMT:
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// assertEquals("Result is 59 USD");
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assertEquals("Result is 59 USD", 59.0, c.convert("CZK", "USD", 1003.0, (new GregorianCalendar(2008, 9, 1, 6, 0)).getTime()));
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// convert 16CZK using c at 2008-10-02 9:00 GMT:
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// assertEquals("Result is 20 SKK");
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assertEquals("Result is 20 SKK", 20.0, c.convert("CZK", "SKK", 16.0, (new GregorianCalendar(2008, 9, 2, 9, 0)).getTime()));
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// convert 500SKK to CZK using c at 2008-10-02 9:00 GMT:
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// assertEquals("Result is 400 CZK");
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assertEquals("Result is 400 CZK", 400.0, c.convert("SKK", "CZK", 500.0, (new GregorianCalendar(2008, 9, 2, 9, 0)).getTime()));
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// convert 500SKK to CZK using c at 2008-10-01 6:00 GMT:
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// cannot convert as no rate is applicable to current date
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try {
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c.convert("SKK", "CZK", 500.0, (new GregorianCalendar(2008, 9, 1, 6, 0)).getTime());
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fail();
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} catch (IllegalArgumentException e) {
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//ok
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}
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}
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/** Create convertor that understands two currencies, CZK and
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* SKK. Make 100 SKK == 90 CZK.
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*
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* @return prepared convertor ready for converting SKK to CZK and CZK to SKK
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*/
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public static Convertor createSKKtoCZK2() {
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return ConvertorFactory.newInstance().createConvertor("SKK", "CZK", 100, 90);
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}
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public void testDateConvetorWithTwoDifferentRates() throws Exception {
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Date d1 = (new GregorianCalendar(2008,9,1,0,0)).getTime(); // 2008-10-01 0:00 GMT
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Date d2 = (new GregorianCalendar(2008,9,2,0,0)).getTime(); // 2008-10-02 0:00 GMT
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Date d3 = (new GregorianCalendar(2008,9,6,0,0)).getTime(); // 2008-10-03 0:00 GMT
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Convertor c = Task2Test.merge(
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limitTo(createSKKtoCZK2(), d1, d2),
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limitTo(Task1Test.createSKKtoCZK(), d2, d3)
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);
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// convert 500SKK to CZK using c at 2008-10-02 9:00 GMT:
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// assertEquals("Result is 400 CZK");
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assertEquals("Result is 400 CZK", 400.0, c.convert("SKK", "CZK", 500.0, (new GregorianCalendar(2008, 9, 2, 9, 0)).getTime()));
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// convert 500SKK to CZK using c at 2008-10-01 6:00 GMT:
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// assertEquals("Result is 450 CZK");
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assertEquals("Result is 450 CZK", 450.0, c.convert("SKK", "CZK", 500.0, (new GregorianCalendar(2008, 9, 1, 6, 0)).getTime()));
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}
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}
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