package org.apidesign.apifest08.currency;

import java.util.Currency;

/**

 * Creates default {@link Convertor} implementations.

 * @author lukas

 *

 */

public class ConvertorFactory {

	private static final DefaultConvertorFactory DEFAULT_FACTORY = new DefaultConvertorFactory();

	private ConvertorFactory()

	{

		//nothing

	}

	/**

	 * Creates {@link Convertor} that converts from sourceCurrency to destinationCurrency with stored exchange rate.

	 * @param sourceCurrency

	 * @param destinationCurrency

	 * @return

	 * @throws UnsupportedConversionException when exchange rate between currencies is not known.

	 */

	/*

	 * Only one of the createConveror methods is needed. The assignment is not explicit where the exchange rate should be set.

	 */

	public static final Convertor createConvertor(Currency sourceCurrency, Currency destinationCurrency) throws UnsupportedConversionException

	{

		return DEFAULT_FACTORY.getConvertor(sourceCurrency, destinationCurrency);

	}

	/**

	 * Creates {@link Convertor} that converts from sourceEquivalent.currency to destinationEquivalent.currency. 

	 * Exchange rate is set as equivalents. It means if you want to create USD to CZK convertor where USD1 = CZK17 

     * call createConvertor(new MoneyImpl(1, USD), new MoneyImpl(17, CZK)).

	 * @param sourceEquivalent

	 * @param destinationEquivalent

	 * @return

	 */

	/*

	 * Only one of the createConveror methods is needed. The assignment is not explicit where the exchange rate should be set.

	 */

	public static final Convertor createConvertor(Money sourceEquivalent, Money destinationEquivalent)

	{

		return new DefaultConvertor(sourceEquivalent.getAmount(), destinationEquivalent.getAmount(), sourceEquivalent.getCurrency(), destinationEquivalent.getCurrency());

	}

}