1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/task4/solution11/src/org/apidesign/apifest08/currency/CurrencyValue.java	Sat Oct 11 23:38:46 2008 +0200
     1.3 @@ -0,0 +1,72 @@
     1.4 +package org.apidesign.apifest08.currency;
     1.5 +
     1.6 +import java.io.Serializable;
     1.7 +
     1.8 +/**
     1.9 + * Value class, holding an amount of the currency & an identifier of the currency.
    1.10 + * Designed to be an immutable.
    1.11 + * 
    1.12 + * Because of a vague definition of types of the both fields,
    1.13 + * the class has generic types, used as types of the fields.
    1.14 + * These types should be immutable classes, too.
    1.15 + * 
    1.16 + * @author ked
    1.17 + */
    1.18 +public final class CurrencyValue<AmountType, IdentifierType> implements Serializable {
    1.19 +
    1.20 +    private final AmountType amount;
    1.21 +    private final IdentifierType identifier;
    1.22 +
    1.23 +    private CurrencyValue(AmountType amount, IdentifierType identifier) {
    1.24 +        this.amount = amount;
    1.25 +        this.identifier = identifier;
    1.26 +    }
    1.27 +
    1.28 +    public AmountType getAmount() {
    1.29 +        return amount;
    1.30 +    }
    1.31 +
    1.32 +    public IdentifierType getIdentifier() {
    1.33 +        return identifier;
    1.34 +    }
    1.35 +
    1.36 +    @Override
    1.37 +    public boolean equals(Object obj) {
    1.38 +        if (obj == null) {
    1.39 +            return false;
    1.40 +        }
    1.41 +        if (getClass() != obj.getClass()) {
    1.42 +            return false;
    1.43 +        }
    1.44 +        final CurrencyValue other = (CurrencyValue) obj;
    1.45 +        if (this.amount != other.amount && (this.amount == null || !this.amount.equals(other.amount))) {
    1.46 +            return false;
    1.47 +        }
    1.48 +        if (this.identifier != other.identifier && (this.identifier == null || !this.identifier.equals(other.identifier))) {
    1.49 +            return false;
    1.50 +        }
    1.51 +        return true;
    1.52 +    }
    1.53 +
    1.54 +    @Override
    1.55 +    public int hashCode() {
    1.56 +        int hash = 7;
    1.57 +        hash = 97 * hash + (this.amount != null ? this.amount.hashCode() : 0);
    1.58 +        hash = 97 * hash + (this.identifier != null ? this.identifier.hashCode() : 0);
    1.59 +        return hash;
    1.60 +    }
    1.61 +
    1.62 +    /**
    1.63 +     * Creates new instance.
    1.64 +     * Generic types of the new instance are derived from types of the parameters.
    1.65 +     * 
    1.66 +     * @param <AmountType> type of the currency amount
    1.67 +     * @param <IdentifierType> type of the currency identifier
    1.68 +     * @param amount currency amount
    1.69 +     * @param identifier currency identifier
    1.70 +     * @return new instance
    1.71 +     */
    1.72 +    public static <AmountType, IdentifierType> CurrencyValue<AmountType, IdentifierType> getCurrencyValue(AmountType amount, IdentifierType identifier) {
    1.73 +        return new CurrencyValue<AmountType, IdentifierType>(amount, identifier);
    1.74 +    }
    1.75 +}