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package org.apidesign.apifest08.test;
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import java.util.Currency;
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import junit.framework.TestCase;
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import org.apidesign.apifest08.currency.ConversionRate;
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import org.apidesign.apifest08.currency.Convertor;
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import org.apidesign.apifest08.currency.IllegalRequestSubtypeException;
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import org.apidesign.apifest08.currency.MonetaryAmount;
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import org.apidesign.apifest08.currency.TableConvertor;
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/** There are many currencies around the world and many banks manipulate
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* with more than one or two at the same time. As banks are usually the
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* best paying clients, which is true even in case of your Convertor API,
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* it is reasonable to listen to their requests.
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* <p>
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* The quest for today is to enhance your existing convertor API to hold
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* information about many currencies and allow conversions between any of them.
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* Also, as conversion rates for diferent currencies usually arise from various
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* bank departments, there is another important need. There is a need to
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* compose two convertors into one by merging all the information about
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* currencies they know about.
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*/
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public class Task2Test extends TestCase {
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public Task2Test(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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protected static final Currency CZK = Currency.getInstance( "CZK" );
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protected static final Currency SKK = Currency.getInstance( "SKK" );
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protected static final Currency USD = Currency.getInstance( "USD" );
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// As in Task1Test, keep in mind, that there are three parts
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// of the whole system:
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// 1. there is someone who knows the current exchange rate
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// 2. there is someone who wants to do the conversion
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// 3. there is the API between 1. and 2. which allows them to communicate
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//
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// Please backward compatibly enhance your existing API to support following
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// usecases:
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//
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/** Create convertor that understands two currencies, CZK and
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* SKK. Make 100 SKK == 75 CZK. This is method for the group of users that
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* knows the exchange rate, and needs to use the API to create objects
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* with the exchange rate. Anyone shall be ready to call this method without
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* any other method being called previously. The API itself shall know
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* nothing about any rates, before this method is called.
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*/
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public static Convertor createTripleConvertor() {
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// Rates: 1USD = 15CZK
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// Rates: 1USD = 20SKK
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// Rates: 75CZK = 100SKK
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final TableConvertor convertor = new TableConvertor();
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final MonetaryAmount amountInUSD = new MonetaryAmount( 1, USD );
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final MonetaryAmount amountInCZK = new MonetaryAmount( 15, CZK );
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final MonetaryAmount amountInSKK = new MonetaryAmount( 20, SKK );
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convertor.putIntoTable( new ConversionRate( amountInCZK, amountInUSD ) );
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convertor.putIntoTable( new ConversionRate( amountInUSD, amountInCZK ) );
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convertor.putIntoTable( new ConversionRate( amountInSKK, amountInUSD ) );
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convertor.putIntoTable( new ConversionRate( amountInUSD, amountInSKK ) );
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convertor.putIntoTable( new ConversionRate( amountInSKK, amountInCZK ) );
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convertor.putIntoTable( new ConversionRate( amountInCZK, amountInSKK ) );
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return new ContractImposingDelegatingConvertor( convertor ).test();
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}
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/** Define convertor that understands three currencies. Use it.
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*/
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public void testConvertorForUSDandCZKandSKK() throws Exception {
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final Convertor c = createTripleConvertor();
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// convert $5 to CZK using c:
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final Convertor.ConversionResult r1 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 5, USD ), CZK ) );
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final MonetaryAmount a1 = r1.getNetAmount();
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// assertEquals("Result is 75 CZK");
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assertNotNull( a1 );
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assertEquals( 75.0, a1.getAmount().doubleValue() );
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assertEquals( CZK, a1.getCurrency() );
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// convert $5 to SKK using c:
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final Convertor.ConversionResult r2 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 5, USD ), SKK ) );
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final MonetaryAmount a2 = r2.getNetAmount();
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// assertEquals("Result is 100 SKK");
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assertNotNull( a2 );
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assertEquals( 100.0, a2.getAmount().doubleValue() );
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assertEquals( SKK, a2.getCurrency() );
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// convert 200SKK to CZK using c:
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final Convertor.ConversionResult r3 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 200, SKK ), CZK ) );
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final MonetaryAmount a3 = r3.getNetAmount();
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// assertEquals("Result is 150 CZK");
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assertNotNull( a3 );
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assertEquals( 150.0, a3.getAmount().doubleValue() );
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assertEquals( CZK, a3.getCurrency() );
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// convert 200SKK to USK using c:
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final Convertor.ConversionResult r4 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 200, SKK ), USD ) );
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final MonetaryAmount a4 = r4.getNetAmount();
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// assertEquals("Result is 10 USD");
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assertNotNull( a4 );
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assertEquals( 10.0, a4.getAmount().doubleValue() );
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assertEquals( USD, a4.getCurrency() );
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}
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/** Merge all currency rates of convertor 1 with convertor 2.
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* Implement this using your API, preferably this method just delegates
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* into some API method which does the actual work, without requiring
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* API clients to code anything complex.
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*/
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public static Convertor merge( final Convertor one, final Convertor two ) {
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return new Convertor() {
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public ConversionResult convert( ConversionRequest req ) throws IllegalRequestSubtypeException {
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final ConversionResult res1 = one.convert( req );
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final ConversionResult res2 = two.convert( req );
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if ( res1.getNetAmount() != null ) {
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if ( res2.getNetAmount() != null ) {
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// TODO check if they arrive at the same thing
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return res1;
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} else {
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return res1;
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}
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} else {
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if ( res2.getNetAmount() != null ) {
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return res2;
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} else {
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// neither converts
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return new ConversionResult( null );
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}
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}
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}
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};
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}
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/** Join the convertors from previous task, Task1Test and show that it
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* can be used to do reasonable conversions.
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*/
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public void testConvertorComposition() throws Exception {
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final Convertor c = merge(
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Task1Test.createCZKtoUSD(),
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Task1Test.createSKKtoCZK()
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);
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// convert $5 to CZK using c:
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final Convertor.ConversionResult r1 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 5, USD ), CZK ) );
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final MonetaryAmount a1 = r1.getNetAmount();
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// assertEquals("Result is 85 CZK");
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assertNotNull( a1 );
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assertEquals( 85.0, a1.getAmount().doubleValue() );
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assertEquals( CZK, a1.getCurrency() );
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// convert $8 to CZK
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final Convertor.ConversionResult r2 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 8, USD ), CZK ) );
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final MonetaryAmount a2 = r2.getNetAmount();
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// assertEquals("Result is 136 CZK");
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assertNotNull( a2 );
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assertEquals( 136.0, a2.getAmount().doubleValue() );
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assertEquals( CZK, a2.getCurrency() );
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// convert 1003CZK to USD
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final Convertor.ConversionResult r3 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 1003, CZK ), USD ) );
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final MonetaryAmount a3 = r3.getNetAmount();
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// assertEquals("Result is 59 USD");
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assertNotNull( a3 );
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assertEquals( 59.0, a3.getAmount().doubleValue() );
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assertEquals( USD, a3.getCurrency() );
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// convert 16CZK using c:
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final Convertor.ConversionResult r4 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 16, CZK ), SKK ) );
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final MonetaryAmount a4 = r4.getNetAmount();
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// assertEquals("Result is 20 SKK");
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assertNotNull( a4 );
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assertEquals( 20.0, a4.getAmount().doubleValue() );
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assertEquals( SKK, a4.getCurrency() );
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// convert 500SKK to CZK using c:
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final Convertor.ConversionResult r5 = c.convert( new Convertor.ConversionRequest( new MonetaryAmount( 500, SKK ), CZK ) );
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final MonetaryAmount a5 = r5.getNetAmount();
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// assertEquals("Result is 400 CZK");
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assertNotNull( a5 );
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assertEquals( 400.0, a5.getAmount().doubleValue() );
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assertEquals( CZK, a5.getCurrency() );
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}
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}
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