1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/task3/solution13/src/org/apidesign/apifest08/currency/ExchangeRateProvider.java Tue Oct 07 11:05:34 2008 +0200
1.3 @@ -0,0 +1,152 @@
1.4 +
1.5 +package org.apidesign.apifest08.currency;
1.6 +
1.7 +import java.math.BigDecimal;
1.8 +import java.util.Date;
1.9 +import java.util.HashMap;
1.10 +import java.util.Map;
1.11 +
1.12 +/**
1.13 + * Exchange rate provider. Provides fixed exchange rate which does not depend
1.14 + * on date (method {@link #getExchangeRate()} ).
1.15 + *
1.16 + * Date dependend exchange rate to be implemented.
1.17 + *
1.18 + * @author arnostvalicek
1.19 + */
1.20 +public class ExchangeRateProvider {
1.21 + BigDecimal fromValue, toValue;
1.22 + ConvertorCurrency fromCurrency, toCurrency;
1.23 +
1.24 + Map exchangeRateMap = new HashMap();
1.25 +
1.26 + /**
1.27 + * Simple constructor for <code>ExchangeRateProviderM</code> which can provide fixed exchange rate.
1.28 + *
1.29 + * Describes conversion <em>from ONE</em> to <em>to ONE</em> currency.
1.30 + *
1.31 + * @param fromValue From value. BigDecimal value, precision should be set to currency precision.
1.32 + * @param fromCurrency From currency.
1.33 + * @param toValue To value. BigDecimal value, precision should be set to currency precision.
1.34 + * @param toCurrency To currency.
1.35 + * @deprecated deprecated since task2. Use {@link #createExchangeRateProvider() } instead of this constructor.
1.36 + */
1.37 + public ExchangeRateProvider(BigDecimal fromValue, ConvertorCurrency fromCurrency, BigDecimal toValue, ConvertorCurrency toCurrency) {
1.38 + this.fromValue = fromValue;
1.39 + this.toValue = toValue;
1.40 + this.fromCurrency = fromCurrency;
1.41 + this.toCurrency = toCurrency;
1.42 + }
1.43 +
1.44 + private ExchangeRateProvider() {
1.45 +
1.46 + }
1.47 +
1.48 + /**
1.49 + * Static method to create new exchange rate provider. This exchange rate provider does not contain
1.50 + * any exchange rates (this is difference to public constructor).
1.51 + * @return New <code>ExchangeRateProvider</code>
1.52 + */
1.53 + public static ExchangeRateProvider createExchangeRateProvider() {
1.54 + ExchangeRateProvider provider = new ExchangeRateProvider();
1.55 + return provider;
1.56 + }
1.57 +
1.58 + /**
1.59 + * Add new exchange rate to <code></code> to this exchange rate provider.
1.60 + * <p>
1.61 + * Example of specifiing conversion rate: 100 SKK == 80 CZK:<br>
1.62 + * <code>addFixedCurencyRate(ConvertorCurrency.getInstance("SKK"), new BigDecimal(100), ConvertorCurrency.getInstance("CZK"), new BigDecimal(80));</code>
1.63 + * <p>
1.64 + *
1.65 + * @param fromCurrency Source currency.
1.66 + * @param fromValue Valye for from currency.
1.67 + * @param toCurrency Target currency.
1.68 + * @param toValue Value for target currency.
1.69 + */
1.70 + public synchronized void addFixedCurencyRate(ConvertorCurrency fromCurrency, BigDecimal fromValue, ConvertorCurrency toCurrency, BigDecimal toValue) {
1.71 + if (fromValue==null) {
1.72 + throw new NullPointerException("fromValue can't be null");
1.73 + }
1.74 + if (toValue==null) {
1.75 + throw new NullPointerException("toValue can't be null");
1.76 + }
1.77 + Map map2 = (Map) exchangeRateMap.get(fromCurrency);
1.78 + if (map2==null) {
1.79 + map2 = new HashMap();
1.80 + exchangeRateMap.put(fromCurrency, map2);
1.81 + }
1.82 +
1.83 + ExchangeRate rate = new ExchangeRate(fromValue, toValue);
1.84 + map2.put(toCurrency, rate);
1.85 + }
1.86 +
1.87 + /**
1.88 + * Get fixed exange rate for currencies (from->to).
1.89 + * @return Returns exchange rate.
1.90 + * @deprecated deprecated since task2. Use {@link #getExchangeRate(ConvertorCurrency, ConvertorCurrency) }
1.91 + */
1.92 + public ExchangeRate getExchangeRate() {
1.93 + return new ExchangeRate(fromValue, toValue);
1.94 + }
1.95 +
1.96 +
1.97 + /**
1.98 + * Get fixed exange rate for currencies (from->to).
1.99 + * @return Returns exchange rate or <code>null</code> if exchange rate not found.
1.100 + */
1.101 + public ExchangeRate getExchangeRate(ConvertorCurrency fromCurrency, ConvertorCurrency toCurrency) {
1.102 + return getExchangeRateImpl(fromCurrency, toCurrency);
1.103 + }
1.104 +
1.105 + /**
1.106 + * Get fixed exange rate for currencies (from->to) or reversed exchange rate (to->from).
1.107 + * @return Returns exchange rate or <code>null</code> if exchange rate not found.
1.108 + */
1.109 + public ExchangeRate getReversibleExchangeRate(ConvertorCurrency fromCurrency, ConvertorCurrency toCurrency) {
1.110 + ExchangeRate rate = getExchangeRateImpl(fromCurrency, toCurrency);
1.111 + if (rate==null) {
1.112 + ExchangeRate revertedRate = getExchangeRateImpl(toCurrency, fromCurrency);
1.113 + if (revertedRate!=null) {
1.114 + rate = ExchangeRate.createRevertedRate(revertedRate);
1.115 + }
1.116 + }
1.117 + return rate;
1.118 + }
1.119 +
1.120 +
1.121 +
1.122 + /**
1.123 + * Get exchange rate for currencies (from->to) based on provided date.
1.124 + * @param date Date for which exchange rate should be provided.
1.125 + * @return Returns exchange rate
1.126 + * @deprecated deprecated since task2. No real implementation in version2.
1.127 + */
1.128 + public ExchangeRate getExchangeRate(Date date) {
1.129 + return new ExchangeRate(fromValue, toValue);
1.130 + }
1.131 +
1.132 +
1.133 + ConvertorCurrency getFromCurrency() {
1.134 + return fromCurrency;
1.135 + }
1.136 +
1.137 + ConvertorCurrency getToCurrency() {
1.138 + return toCurrency;
1.139 + }
1.140 +
1.141 + private ExchangeRate getExchangeRateImpl(ConvertorCurrency fromCurrency, ConvertorCurrency toCurrency) {
1.142 + if (fromValue != null && toValue != null && fromCurrency.equals(this.fromCurrency) && toCurrency.equals(this.toCurrency)) {
1.143 + return new ExchangeRate(fromValue, toValue);
1.144 + }
1.145 + //return new ExchangeRate(fromValue, toValue);
1.146 + Map map2 = (Map) exchangeRateMap.get(fromCurrency);
1.147 + if (map2 == null) {
1.148 + return null;
1.149 + }
1.150 + ExchangeRate result = (ExchangeRate) map2.get(toCurrency);
1.151 + return result;
1.152 + }
1.153 +
1.154 +
1.155 +}