package org.apidesign.apifest08.currency;

 import java.math.BigDecimal;

 /**

  * Exchange rate value. Contains <code>from</code> and <code>to</code> value.

  * 

  * @author arnostvalicek

  */

 public class ExchangeRate {

     private BigDecimal numberFor;

     private BigDecimal numberGet;

     /**

      * Constructor for new exchange rate holding two values - <em>from value</em> and <em>to value</em>

      * @param fromValue Exchange rate <em>from value</em>

      * @param toValue Exchange rate <em>to value</em>

      */

     public  ExchangeRate(BigDecimal fromValue, BigDecimal toValue) {

         this.numberFor = fromValue;

         this.numberGet = toValue;

     }

     /**

      * Create new instance of <code>ExchangeRate</code> based on provided exchange rate, but swapping its

      * <em>from</em> and <em>to</em> value.

      * <p>

      * Provided exchange rate is not chaged, this method returns different instance describing reverted exchange rate.

      * 

      * @param rate Exchange rate which describes rate to be reverted.

      * @return Instance of reverted rate.

      */

     public static ExchangeRate createRevertedRate(ExchangeRate rate) {

         ExchangeRate reverted = new ExchangeRate(rate.getToValue(), rate.getFromValue());

         return reverted;

     }

     @Override

     public String toString() {

         return "for "+numberFor+" recieve "+numberGet+" @"+getClass().getName();

     }

     /**

      * Return exchange rate <em>from</em> value stored in this object.

      * @return Returns <em>from</em> value for this exchange rate.

      */

     public BigDecimal getFromValue() {

         return numberFor;

     }

     /**

      * Return exchange rate <em>to</em> value stored in this object.

      * @return Returns <em>to</em> value for this exchange rate.

      */

     public BigDecimal getToValue() {

         return numberGet;

     }

 //    public ExchangeRate createExchangeRate(BigDecimal forValue, BigDecimal getValue) {

 //        ExchangeRate rate = new ExchangeRate(forValue, getValue);

 //        return rate;

 //    }

 }