amountconverter.java

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package itso.bank.util;

import itso.bank.exception.InvalidAmountException;
import java.text.NumberFormat;
import java.math.BigDecimal;

/**
 * Converts string currency amounts into ints back and forth.
 * 
 * @author Fabio Ferraz
 */

public class AmountConverter
{
	public static BigDecimal fromString(String amount) throws InvalidAmountException {
		BigDecimal result;
		// Try to convert from a string without the currency sign
		try {
			result = new BigDecimal(amount);
		} catch (NumberFormatException e1) {
			// Try to convert from a string with the currency sign then
			try {
				double resultD = NumberFormat
							.getCurrencyInstance()
							.parse(amount)
							.doubleValue();
				result = new BigDecimal(resultD);
			} catch (Exception e2) {
				// Both attempts failed. Throw an exception
				throw new InvalidAmountException();
			}
		}
		return result;
	}

	public static String fromDecimal(java.math.BigDecimal amount) {
		return "$"+amount.toString();
	}
}