1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/task4/solution07/test/org/apidesign/apifest08/test/Task1Test.java Sat Oct 11 23:38:46 2008 +0200
1.3 @@ -0,0 +1,177 @@
1.4 +package org.apidesign.apifest08.test;
1.5 +
1.6 +import java.util.Currency;
1.7 +import junit.framework.TestCase;
1.8 +import org.apidesign.apifest08.currency.ConversionRate;
1.9 +import org.apidesign.apifest08.currency.Convertor;
1.10 +import org.apidesign.apifest08.currency.MonetaryAmount;
1.11 +import org.apidesign.apifest08.currency.TableConvertor;
1.12 +
1.13 +/** Finish the Convertor API, and then write bodies of methods inside
1.14 + * of this class to match the given tasks. To fullfil your task, use the
1.15 + * API define in the <code>org.apidesign.apifest08.currency</code> package.
1.16 + * Do not you reflection, or other hacks as your code
1.17 + * shall run without any runtime permissions.
1.18 + */
1.19 +public class Task1Test extends TestCase {
1.20 + public Task1Test(String testName) {
1.21 + super(testName);
1.22 + }
1.23 +
1.24 + @Override
1.25 + protected void setUp() throws Exception {
1.26 + }
1.27 +
1.28 + @Override
1.29 + protected void tearDown() throws Exception {
1.30 + }
1.31 +
1.32 + //
1.33 + // Imagine that there are three parts of the whole system:
1.34 + // 1. there is someone who knows the current exchange rate
1.35 + // 2. there is someone who wants to do the conversion
1.36 + // 3. there is the API between 1. and 2. which allows them to communicate
1.37 + // Please design such API
1.38 + //
1.39 +
1.40 + protected static final Currency CZK = Currency.getInstance( "CZK" );
1.41 + protected static final Currency SKK = Currency.getInstance( "SKK" );
1.42 + protected static final Currency USD = Currency.getInstance( "USD" );
1.43 +
1.44 + /** Create convertor that understands two currencies, CZK and
1.45 + * USD. Make 1 USD == 17 CZK.
1.46 + * USD. Make 1 USD == 17 CZK. This is a method provided for #1 group -
1.47 + * e.g. those that know the exchange rate. They somehow need to create
1.48 + * the objects from the API and tell them the exchange rate. The API itself
1.49 + * knows nothing about any rates, before the createCZKtoUSD method is called.
1.50 + *
1.51 + * Creation of the convertor shall not require subclassing of any class
1.52 + * or interface on the client side.
1.53 + *
1.54 + * @return prepared convertor ready for converting USD to CZK and CZK to USD
1.55 + */
1.56 + public static Convertor createCZKtoUSD() {
1.57 + final TableConvertor convertor = new TableConvertor();
1.58 + final MonetaryAmount amountInCZK = new MonetaryAmount( 17, CZK );
1.59 + final MonetaryAmount amountInUSD = new MonetaryAmount( 1, USD );
1.60 + convertor.putIntoTable( new ConversionRate( amountInCZK, amountInUSD ) );
1.61 + convertor.putIntoTable( new ConversionRate( amountInUSD, amountInCZK ) );
1.62 + return new ContractImposingDelegatingConvertor( convertor ).test();
1.63 + }
1.64 +
1.65 + /** Create convertor that understands two currencies, CZK and
1.66 + * SKK. Make 100 SKK == 80 CZK. Again this is method for the #1 group -
1.67 + * it knows the exchange rate, and needs to use the API to create objects
1.68 + * with the exchange rate. Anyone shall be ready to call this method without
1.69 + * any other method being called previously. The API itself shall know
1.70 + * nothing about any rates, before this method is called.
1.71 + *
1.72 + * Creation of the convertor shall not require subclassing of any class
1.73 + * or interface on the client side.
1.74 + *
1.75 + * @return prepared convertor ready for converting SKK to CZK and CZK to SKK
1.76 + */
1.77 + public static Convertor createSKKtoCZK() {
1.78 + final TableConvertor convertor = new TableConvertor();
1.79 + final MonetaryAmount amountInSKK = new MonetaryAmount( 100, SKK );
1.80 + final MonetaryAmount amountInCZK = new MonetaryAmount( 80, CZK );
1.81 + convertor.putIntoTable( new ConversionRate( amountInSKK, amountInCZK ) );
1.82 + convertor.putIntoTable( new ConversionRate( amountInCZK, amountInSKK ) );
1.83 + return new ContractImposingDelegatingConvertor( convertor ).test();
1.84 + }
1.85 +
1.86 + //
1.87 + // now the methods for group #2 follow:
1.88 + // this group knows nothing about exchange rates, but knows how to use
1.89 + // the API to do conversions. It somehow (by calling one of the factory
1.90 + // methods) gets objects from the API and uses them to do the conversions.
1.91 + //
1.92 +
1.93 + /** Use the convertor from <code>createCZKtoUSD</code> method and do few conversions
1.94 + * with it.
1.95 + */
1.96 + public void testCurrencyCZKUSD() throws Exception {
1.97 + final Convertor c = createCZKtoUSD();
1.98 +
1.99 + // convert $5 to CZK using c:
1.100 + final Convertor.ConversionResult r1 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 5, USD ), CZK ) );
1.101 + final MonetaryAmount a1 = r1.getNetAmount();
1.102 + // assertEquals("Result is 85 CZK");
1.103 + assertNotNull( a1 );
1.104 + assertEquals( 85.0, a1.getAmount().doubleValue() );
1.105 + assertEquals( CZK, a1.getCurrency() );
1.106 +
1.107 + // convert $8 to CZK
1.108 + final Convertor.ConversionResult r2 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 8, USD ), CZK ) );
1.109 + final MonetaryAmount a2 = r2.getNetAmount();
1.110 + // assertEquals("Result is 136 CZK");
1.111 + assertNotNull( a2 );
1.112 + assertEquals( 136.0, a2.getAmount().doubleValue() );
1.113 + assertEquals( CZK, a2.getCurrency() );
1.114 +
1.115 + // convert 1003CZK to USD
1.116 + final Convertor.ConversionResult r3 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 1003, CZK ), USD ) );
1.117 + final MonetaryAmount a3 = r3.getNetAmount();
1.118 + // assertEquals("Result is 59 USD");
1.119 + assertNotNull( a3 );
1.120 + assertEquals( 59.0, a3.getAmount().doubleValue() );
1.121 + assertEquals( USD, a3.getCurrency() );
1.122 + }
1.123 +
1.124 + /** Use the convertor from <code>createSKKtoCZK</code> method and do few conversions
1.125 + * with it.
1.126 + */
1.127 + public void testCurrencySKKCZK() throws Exception {
1.128 + final Convertor c = createSKKtoCZK();
1.129 +
1.130 + // convert 16CZK using c:
1.131 + final Convertor.ConversionResult r1 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 16, CZK ), SKK ) );
1.132 + final MonetaryAmount a1 = r1.getNetAmount();
1.133 + // assertEquals("Result is 20 SKK");
1.134 + assertNotNull( a1 );
1.135 + assertEquals( 20.0, a1.getAmount().doubleValue() );
1.136 + assertEquals( SKK, a1.getCurrency() );
1.137 +
1.138 + // convert 500SKK to CZK
1.139 + final Convertor.ConversionResult r2 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 500, SKK ), CZK ) );
1.140 + final MonetaryAmount a2 = r2.getNetAmount();
1.141 + // assertEquals("Result is 400 CZK");
1.142 + assertNotNull( a2 );
1.143 + assertEquals( 400.0, a2.getAmount().doubleValue() );
1.144 + assertEquals( CZK, a2.getCurrency() );
1.145 + }
1.146 +
1.147 + /** Verify that the CZK to USD convertor knows nothing about SKK.
1.148 + */
1.149 + public void testCannotConvertToSKKwithCZKUSDConvertor() throws Exception {
1.150 + final Convertor c = createCZKtoUSD();
1.151 +
1.152 + // convert $5 to SKK, the API shall say this is not possible
1.153 + final Convertor.ConversionResult r1 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 5, USD ), SKK ) );
1.154 + final MonetaryAmount a1 = r1.getNetAmount();
1.155 + assertNull( a1 );
1.156 +
1.157 + // convert 500 SKK to CZK, the API shall say this is not possible
1.158 + final Convertor.ConversionResult r2 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 5, SKK ), CZK ) );
1.159 + final MonetaryAmount a2 = r2.getNetAmount();
1.160 + assertNull( a2 );
1.161 + }
1.162 +
1.163 + /** Verify that the CZK to SKK convertor knows nothing about USD.
1.164 + */
1.165 + public void testCannotConvertToUSDwithCZKSKKConvertor() throws Exception {
1.166 + final Convertor c = createSKKtoCZK();
1.167 +
1.168 + // convert $5 to SKK, the API shall say this is not possible
1.169 + final Convertor.ConversionResult r1 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 5, USD ), SKK ) );
1.170 + final MonetaryAmount a1 = r1.getNetAmount();
1.171 + assertNull( a1 );
1.172 +
1.173 + // convert 500 CZK to USD, the API shall say this is not possible
1.174 + final Convertor.ConversionResult r2 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 5, CZK ), USD ) );
1.175 + final MonetaryAmount a2 = r2.getNetAmount();
1.176 + assertNull( a2 );
1.177 + }
1.178 +
1.179 +}
1.180 +