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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 amount of the currency & an identifier of the currency.
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* Designed to be an immutable.
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*
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* Because of a vague definition of types of the both fields,
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* the class has generic types, used as types of the fields.
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* These types should be immutable classes, too.
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*
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* @author ked
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*/
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public final class CurrencyValue<AmountType, IdentifierType> implements Serializable {
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private final AmountType amount;
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private final IdentifierType identifier;
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private CurrencyValue(AmountType amount, IdentifierType identifier) {
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this.amount = amount;
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this.identifier = identifier;
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}
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public AmountType getAmount() {
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return amount;
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}
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public IdentifierType getIdentifier() {
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return identifier;
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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 CurrencyValue other = (CurrencyValue) obj;
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if (this.amount != other.amount && (this.amount == null || !this.amount.equals(other.amount))) {
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return false;
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}
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if (this.identifier != other.identifier && (this.identifier == null || !this.identifier.equals(other.identifier))) {
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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 = 7;
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hash = 97 * hash + (this.amount != null ? this.amount.hashCode() : 0);
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hash = 97 * hash + (this.identifier != null ? this.identifier.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 amount currency amount
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* @param identifier currency identifier
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* @return new instance
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*/
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public static <AmountType, IdentifierType> CurrencyValue<AmountType, IdentifierType> getCurrencyValue(AmountType amount, IdentifierType identifier) {
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return new CurrencyValue<AmountType, IdentifierType>(amount, identifier);
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}
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}
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