Amount.java

package com.xerox.amazonws.fps;

import java.io.Serializable;
import java.math.BigDecimal;

public class Amount implements Comparable, Serializable {
    private BigDecimal amount;
    private final String currencyCode;

    public static final String USD = "USD";
    public static final Amount ZERO_USD = new Amount(BigDecimal.ZERO, USD);

    public Amount(BigDecimal amount, String currencyCode) {
        this.amount = amount;
        this.currencyCode = currencyCode;
    }

    public Amount(double amount, String currencyCode) {
        this.amount = new BigDecimal(Double.toString(amount));
        this.currencyCode = currencyCode;
    }

    public BigDecimal getAmount() {
        return amount;
    }

    public String getCurrencyCode() {
        return currencyCode;
    }

    public Amount add(int amount, String currencyCode) {
        return add(new BigDecimal(amount), currencyCode);
    }

    public Amount add(BigDecimal amount, String currencyCode) {
        if (!this.currencyCode.equals(currencyCode))
            throw new IllegalArgumentException("Can't add some " + currencyCode + " to some " + this.currencyCode);
        this.amount = this.amount.add(amount);
        return this;
    }

    public int compareTo(Object o) {
        if (o == null)
            return -1;
        if (!(o instanceof Amount))
            return -1;
        Amount other = (Amount) o;
        if (!getCurrencyCode().equals(other.getCurrencyCode()))
            return getCurrencyCode().compareTo(other.getCurrencyCode());
        else
            return getAmount().compareTo(other.getAmount());
    }

    public static Amount parseAmount(String value) {
        String[] strings = value.split(" ");
        return new Amount(new BigDecimal(strings[0]), strings[1]);
    }

    @Override
    public String toString() {
        return "Amount{" +
                "amount=" + amount +
                ", currencyCode='" + currencyCode + '\'' +
                '}';
    }
}