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package org.apidesign.apifest08.test;
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import junit.framework.TestCase;
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import org.apidesign.apifest08.currency.*;
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import java.math.BigDecimal;
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import java.math.RoundingMode;
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import java.util.Currency;
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/**
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* Finish the Convertor API, and then write bodies of methods inside
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* of this class to match the given tasks. To fullfil your task, use the
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* API define in the <code>org.apidesign.apifest08.currency</code> package.
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* Do not you reflection, or other hacks as your code
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* shall run without any runtime permissions.
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*/
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public class Task1Test extends TestCase {
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private static CurrencyConvertorFactory currencyConvertorFactoryInstance;
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public Task1Test(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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currencyConvertorFactoryInstance = ConvertorsFactory.getCurrencyConvertorFactoryInstance();
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}
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@Override
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protected void tearDown() throws Exception {
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currencyConvertorFactoryInstance = null;
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}
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/**
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* Create convertor that understands two currencies, CZK and
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* USD. Make 1 USD == 17 CZK.
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* <p/>
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* Creation of the convertor shall not require subclassing of any class
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* or interface on the client side.
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*
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* @return prepared convertor ready for converting USD to CZK and CZK to USD
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*/
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public static Convertor createCZKtoUSD() throws ConvertorNotAvailableException {
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final Currency czk = Currency.getInstance("CZK");
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final Currency usd = Currency.getInstance("USD");
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final BigDecimal constant = BigDecimal.ONE.divide(BigDecimal.valueOf(17), 10, RoundingMode.HALF_EVEN);
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return currencyConvertorFactoryInstance.createConvertor(czk, usd, ConversionProperties.create(constant, RoundingMode.HALF_EVEN));
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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 == 80 CZK.
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* <p/>
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* Creation of the convertor shall not require subclassing of any class
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* or interface on the client side.
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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 createSKKtoCZK() throws ConvertorNotAvailableException {
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final Currency skk = Currency.getInstance("SKK");
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final Currency czk = Currency.getInstance("CZK");
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final BigDecimal constant = new BigDecimal("0.8");
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return currencyConvertorFactoryInstance.createConvertor(skk, czk, ConversionProperties.create(constant, RoundingMode.HALF_EVEN));
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}
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/**
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* Use the convertor from <code>createCZKtoUSD</code> method and do few conversions
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* with it.
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*/
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public void testCurrencyCZKUSD() throws Exception {
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Convertor c = createCZKtoUSD();
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// convert $5 to CZK using c:
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final int czkDigitsScale = c.getCurrency1().getDefaultFractionDigits();
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final int usdDigitsScale = c.getCurrency2().getDefaultFractionDigits();
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assertEquals("Result is 85 CZK", BigDecimal.valueOf(85).setScale(czkDigitsScale), c.convertCurrency2ToCurrency1(BigDecimal.valueOf(5)));
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// convert $8 to CZK
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assertEquals("Result is 136 CZK", BigDecimal.valueOf(136).setScale(czkDigitsScale), c.convertCurrency2ToCurrency1(BigDecimal.valueOf(8)));
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// convert 1003CZK to USD
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assertEquals("Result is 59 USD", BigDecimal.valueOf(59).setScale(usdDigitsScale), c.convertCurrency1ToCurrency2(BigDecimal.valueOf(1003)));
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}
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/**
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* Use the convertor from <code>createSKKtoCZK</code> method and do few conversions
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* with it.
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*/
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public void testCurrencySKKCZK() throws Exception {
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Convertor c = createSKKtoCZK();
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// convert 16CZK using c:
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final int skkDigitsScale = c.getCurrency1().getDefaultFractionDigits();
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final int czkDigitsScale = c.getCurrency2().getDefaultFractionDigits();
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assertEquals("Result is 20 SKK", BigDecimal.valueOf(20).setScale(skkDigitsScale), c.convertCurrency2ToCurrency1(BigDecimal.valueOf(16)));
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// convert 500SKK to CZK
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assertEquals("Result is 400 CZK", BigDecimal.valueOf(400).setScale(czkDigitsScale), c.convertCurrency1ToCurrency2(BigDecimal.valueOf(500)));
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}
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}
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