package org.apidesign.apifest08.currency;

 import java.util.*;

 /**

  * Exception thrown in cases that a CurrencyConverter is unable ensure requested accuracy of conversion.

  * Such situation may occur in cases that the client is not on-line, or the exchange rates are older than

  * requested etc. This exception is defined as RuntimeException to enable simple usage in simple applications,

  * but enable other applications to be informed about possible problems and prevent them from using

  * inaccurate data.

  */

 public final class CurrencyConversionException extends RuntimeException {

 	private final Currency from;

 	private final Currency to;

 	CurrencyConversionException(Currency from, Currency to) {

 		this(from, to, (Throwable) null);

 	}

 	CurrencyConversionException(Currency from, Currency to, Throwable throwable) {

 		this(from, to, String.format("Failed to convert curency from %1$s to %2$s", from, to), throwable);

 	}

 	CurrencyConversionException(Currency from, Currency to, String message) {

 		this(from, to, message, null);

 	}

 	CurrencyConversionException(Currency from, Currency to, String message, Throwable throwable) {

 		super(message, throwable);

 		this.from = from;

 		this.to = to;

 	}

 	public Currency getFromCurrency() {

 		return from;

 	}

 	public Currency getToCurrency() {

 		return to;

 	}

 }