japod@6: /*
japod@6:  * To change this template, choose Tools | Templates
japod@6:  * and open the template in the editor.
japod@6:  */
japod@6: 
japod@6: package org.apidesign.apifest08.test;
japod@6: 
japod@6: import java.math.BigDecimal;
japod@6: import java.util.Currency;
japod@6: import junit.framework.Assert;
japod@6: import org.apidesign.apifest08.currency.Convertor;
japod@6: import org.apidesign.apifest08.currency.DelegatingConvertor;
japod@6: import org.apidesign.apifest08.currency.MonetaryAmount;
japod@6: 
japod@6: /**
japod@6:  * A delegating convertor that checks preconditions and postconditions.
japod@6:  * Useful for testing.
japod@6:  * @author jdvorak
japod@6:  */
japod@6: public class ContractImposingDelegatingConvertor extends DelegatingConvertor {
japod@6: 
japod@6:     public ContractImposingDelegatingConvertor( final Convertor underlyingConvertor ) {
japod@6:         super( underlyingConvertor );
japod@6:     }
japod@6: 
japod@6:     @Override
japod@6:     public ConversionResult convert( final ConversionRequest req ) {
japod@6:         Assert.assertNotNull( "The request", req );
japod@6:         final ConversionResult result = super.convert( req );
japod@6:         Assert.assertNotNull( "Result of the convert() call", result );
japod@6:         final MonetaryAmount netAmount = result.getNetAmount();
japod@6:         if ( netAmount != null ) {
japod@6:             Assert.assertEquals( "Converted to a different currency than specified in the request", req.getTgtCurrency(), netAmount.getCurrency() );
japod@6:         }
japod@6:         return result;
japod@6:     }
japod@6: 
japod@6:     /**
japod@6:      * Do some tests on our own.
japod@6:      * @return this
japod@6:      */
japod@6:     public Convertor test() {
japod@6:         try {
japod@6:             final Currency aCurrency = Currency.getInstance( "EUR" );
japod@6:             new ConversionRequest( new MonetaryAmount( BigDecimal.ONE, aCurrency ), aCurrency );
japod@6:             Assert.fail( "Should have thrown an IllegalArgumentException" );
japod@6:         } catch ( final IllegalArgumentException e ) {
japod@6:             Assert.assertEquals( "Cannot request conversion from EUR to EUR", e.getMessage() );
japod@6:         }
japod@6:         return this;
japod@6:     }
japod@6: 
japod@6: }