japod@23: 
japod@23: package org.apidesign.apifest08.currency;
japod@23: 
japod@23: import java.math.BigDecimal;
japod@23: import java.util.Date;
japod@41: import java.util.HashMap;
japod@41: import java.util.Map;
japod@23: 
japod@23: /**
japod@41:  * Exchange rate provider. Provides fixed exchange rate which does not depend
japod@41:  * on date (method {@link #getExchangeRate()} ).
japod@23:  * 
japod@41:  * Date dependend exchange rate to be implemented.
japod@23:  * 
japod@23:  * @author arnostvalicek
japod@23:  */
japod@23: public class ExchangeRateProvider {
japod@23:     BigDecimal fromValue, toValue;
japod@23:     ConvertorCurrency fromCurrency, toCurrency;
japod@41:     
japod@41:     Map exchangeRateMap = new HashMap();
japod@23: 
japod@23:     /**
japod@23:      * Simple constructor for <code>ExchangeRateProviderM</code> which can provide fixed exchange rate.
japod@23:      * 
japod@41:      * Describes conversion <em>from ONE</em> to <em>to ONE</em> currency.
japod@23:      * 
japod@23:      * @param fromValue From value. BigDecimal value, precision should be set to currency precision.
japod@23:      * @param fromCurrency From currency.
japod@23:      * @param toValue To value. BigDecimal value, precision should be set to currency precision.
japod@23:      * @param toCurrency To currency.
japod@41:      * @deprecated deprecated since task2. Use {@link #createExchangeRateProvider() } instead of this constructor.
japod@23:      */
japod@23:     public ExchangeRateProvider(BigDecimal fromValue, ConvertorCurrency fromCurrency, BigDecimal toValue, ConvertorCurrency toCurrency) {
japod@23:         this.fromValue = fromValue;
japod@23:         this.toValue = toValue;
japod@23:         this.fromCurrency = fromCurrency;
japod@23:         this.toCurrency = toCurrency;
japod@23:     }
japod@23:     
japod@41:     private ExchangeRateProvider() {
japod@41:         
japod@41:     }
japod@41:     
japod@41:     /**
japod@41:      * Static method to create new exchange rate provider. This exchange rate provider does not contain
japod@41:      * any exchange rates (this is difference to public constructor).
japod@41:      * @return New <code>ExchangeRateProvider</code>
japod@41:      */
japod@41:     public static ExchangeRateProvider createExchangeRateProvider() {
japod@41:         ExchangeRateProvider provider = new ExchangeRateProvider();
japod@41:         return provider;
japod@41:     }
japod@41:     
japod@41:     /**
japod@41:      * Add new exchange rate to <code></code> to this exchange rate provider.
japod@41:      * <p>
japod@41:      * Example of specifiing conversion rate: 100 SKK == 80 CZK:<br>
japod@41:      * <code>addFixedCurencyRate(ConvertorCurrency.getInstance("SKK"), new BigDecimal(100), ConvertorCurrency.getInstance("CZK"),  new BigDecimal(80));</code>
japod@41:      * <p>
japod@41:      * 
japod@41:      * @param fromCurrency Source currency.
japod@41:      * @param fromValue Valye for from currency.
japod@41:      * @param toCurrency Target currency.
japod@41:      * @param toValue Value for target currency.
japod@41:      */
japod@41:     public synchronized void addFixedCurencyRate(ConvertorCurrency fromCurrency, BigDecimal fromValue, ConvertorCurrency toCurrency, BigDecimal toValue) {
japod@41:         if (fromValue==null) {
japod@41:             throw new NullPointerException("fromValue can't be null");
japod@41:         }
japod@41:         if (toValue==null) {
japod@41:             throw new NullPointerException("toValue can't be null");
japod@41:         }
japod@41:         Map map2 = (Map) exchangeRateMap.get(fromCurrency);
japod@41:         if (map2==null) {
japod@41:             map2 = new HashMap();
japod@41:             exchangeRateMap.put(fromCurrency, map2);
japod@41:         }
japod@41:         
japod@41:         ExchangeRate rate = new ExchangeRate(fromValue, toValue);
japod@41:         map2.put(toCurrency, rate);
japod@41:     }
japod@41:     
japod@23:     /**
japod@23:      * Get fixed exange rate for currencies (from->to).
japod@23:      * @return Returns exchange rate.
japod@41:      * @deprecated deprecated since task2. Use {@link #getExchangeRate(ConvertorCurrency, ConvertorCurrency) }
japod@23:      */
japod@23:     public ExchangeRate getExchangeRate() {
japod@23:         return new ExchangeRate(fromValue, toValue);
japod@23:     }
japod@41: 
japod@41:     
japod@41:     /**
japod@41:      * Get fixed exange rate for currencies (from->to).
japod@41:      * @return Returns exchange rate or <code>null</code> if exchange rate not found.
japod@41:      */
japod@41:     public ExchangeRate getExchangeRate(ConvertorCurrency fromCurrency, ConvertorCurrency toCurrency) {
japod@41:         return getExchangeRateImpl(fromCurrency, toCurrency);
japod@41:     }
japod@41:     
japod@41:     /**
japod@41:      * Get fixed exange rate for currencies (from->to) or reversed exchange rate (to->from).
japod@41:      * @return Returns exchange rate or <code>null</code> if exchange rate not found.
japod@41:      */
japod@41:     public ExchangeRate getReversibleExchangeRate(ConvertorCurrency fromCurrency, ConvertorCurrency toCurrency) {
japod@41:        ExchangeRate rate = getExchangeRateImpl(fromCurrency, toCurrency);
japod@41:        if (rate==null) {
japod@41:            ExchangeRate revertedRate = getExchangeRateImpl(toCurrency, fromCurrency);
japod@41:            if (revertedRate!=null) {
japod@41:             rate = ExchangeRate.createRevertedRate(revertedRate);
japod@41:            }
japod@41:        }
japod@41:        return rate;
japod@41:     }
japod@41:         
japod@41: 
japod@23:     
japod@23:     /**
japod@23:      * Get exchange rate for currencies (from->to) based on provided date.
japod@23:      * @param date Date for which exchange rate should be provided.
japod@23:      * @return Returns exchange rate 
japod@41:      * @deprecated deprecated since task2. No real implementation in version2.
japod@23:      */
japod@23:     public ExchangeRate getExchangeRate(Date date) {
japod@23:         return new ExchangeRate(fromValue, toValue);
japod@23:     }
japod@23:     
japod@23: 
japod@23:     ConvertorCurrency getFromCurrency() {
japod@23:         return fromCurrency;
japod@23:     }
japod@23:     
japod@23:     ConvertorCurrency getToCurrency() {
japod@23:         return toCurrency;
japod@23:     }
japod@41: 
japod@41:     private ExchangeRate getExchangeRateImpl(ConvertorCurrency fromCurrency, ConvertorCurrency toCurrency) {
japod@41:         if (fromValue != null && toValue != null && fromCurrency.equals(this.fromCurrency) && toCurrency.equals(this.toCurrency)) {
japod@41:             return new ExchangeRate(fromValue, toValue);
japod@41:         }
japod@41:         //return new ExchangeRate(fromValue, toValue);
japod@41:         Map map2 = (Map) exchangeRateMap.get(fromCurrency);
japod@41:         if (map2 == null) {
japod@41:             return null;
japod@41:         }
japod@41:         ExchangeRate result = (ExchangeRate) map2.get(toCurrency);
japod@41:         return result;
japod@41:     }
japod@23:     
japod@23: 
japod@23: }