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package org.apidesign.apifest08.currency;
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import java.io.Serializable;
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/**
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* Value class, holding an exchange rate between two currencies.
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* Designed to be an immutable.
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*
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* @author ked
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*/
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public final class ExchangeRateValue<AmountType, IdentifierType> implements Serializable {
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private final CurrencyValue<AmountType, IdentifierType> currencyA;
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private final CurrencyValue<AmountType, IdentifierType> currencyB;
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private ExchangeRateValue(
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CurrencyValue<AmountType, IdentifierType> currencyA,
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CurrencyValue<AmountType, IdentifierType> currencyB) {
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if (currencyA.getIdentifier() == null ||
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currencyB.getIdentifier() == null ||
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currencyA.getIdentifier().equals(currencyB)) {
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throw new IllegalArgumentException("Inappropriate exchange rates' identifiers!");
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}
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this.currencyA = currencyA;
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this.currencyB = currencyB;
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}
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public CurrencyValue<AmountType, IdentifierType> getCurrencyA() {
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return currencyA;
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}
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public CurrencyValue<AmountType, IdentifierType> getCurrencyB() {
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return currencyB;
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}
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@Override
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public boolean equals(Object obj) {
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if (obj == null) {
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return false;
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}
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if (getClass() != obj.getClass()) {
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return false;
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}
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final ExchangeRateValue other = (ExchangeRateValue) obj;
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if (this.currencyA != other.currencyA && (this.currencyA == null || !this.currencyA.equals(other.currencyA))) {
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return false;
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}
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if (this.currencyB != other.currencyB && (this.currencyB == null || !this.currencyB.equals(other.currencyB))) {
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return false;
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}
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return true;
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}
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@Override
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public int hashCode() {
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int hash = 3;
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hash = 71 * hash + (this.currencyA != null ? this.currencyA.hashCode() : 0);
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hash = 71 * hash + (this.currencyB != null ? this.currencyB.hashCode() : 0);
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return hash;
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}
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/**
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* Creates new instance.
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* Generic types of the new instance are derived from types of the parameters.
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*
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* @param <AmountType> type of the currency amount
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* @param <IdentifierType> type of the currency identifier
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* @param currencyA one currency of the exchange rate
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* @param currencyB another currency of the exchange rate
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* @return new instance
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*/
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public static <AmountType, IdentifierType> ExchangeRateValue<AmountType, IdentifierType> getExchangeRate(
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CurrencyValue<AmountType, IdentifierType> currencyA,
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CurrencyValue<AmountType, IdentifierType> currencyB) {
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return new ExchangeRateValue<AmountType, IdentifierType>(currencyA, currencyB);
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}
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}
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