package auction.model;import java.io.Serializable;import java.math.BigDecimal;import java.util.Currency;/** * Represents a monetary amount as value and currency. * <p> * Has some illustrative and non-funtional money conversion magic. * @author Gavin King * @author Christian Bauer */public class MonetaryAmount implements Serializable {	private final BigDecimal value;	private final Currency currency;	public MonetaryAmount(BigDecimal value, Currency currency) {		this.value = value;		this.currency = currency;	}	public Currency getCurrency() {		return currency;	}	public BigDecimal getValue() {		return value;	}	// ********************** Common Methods ********************** //	public boolean equals(Object o) {		if (this == o) return true;		if (!(o instanceof MonetaryAmount)) return false;		final MonetaryAmount monetaryAmount = (MonetaryAmount) o;		if (!currency.equals(monetaryAmount.currency)) return false;		if (!value.equals(monetaryAmount.value)) return false;		return true;	}	public int hashCode() {		int result;		result = value.hashCode();		result = 29 * result + currency.hashCode();		return result;	}	public String toString() {		return "Value: '" + getValue() + "', " +		        "Currency: '" + getCurrency() + "'";	}	public int compareTo(Object o) {		if (o instanceof MonetaryAmount) {            // TODO: This requires some conversion magic and is therefore not implemented			return this.getValue().compareTo(((MonetaryAmount) o).getValue());		}		return 0;	}	// ********************** Business Methods ********************** //	public static MonetaryAmount fromString(String amount, String currencyCode) {		return new MonetaryAmount(new BigDecimal(amount),								  Currency.getInstance(currencyCode));	}	public static MonetaryAmount convert(MonetaryAmount amount,										 Currency toConcurrency) {		// TODO: This requires some conversion magic and is therefore not implemented		return new MonetaryAmount(amount.getValue(), toConcurrency);	}}