package org.apidesign.apifest08.currency;

 /** This is the skeleton class for your API. You need to make it public, so

  * it is accessible to your client code (currently in Task1Test.java) file.

  * <p>

  * Feel free to create additional classes or rename this one, just keep all

  * the API and its implementation in this package. Do not spread it outside

  * to other packages.

  */

 public class Convertor {

     public static final int FIRST_TO_SECOND = 1;

     public static final int SECOND_TO_FIRST = 2;

     private double first;

     private double second;

     public Convertor(double first, double second) {

         this.first = first;

         this.second = second;

     }

     public double convertFirstToSecond(double value) {

         return (second / first) * value;

     }

     public double convertSecondToFirst(double value) {

         return (first / second) * value;

     }

     public double convert(double value, int typeOfConvert) {

         if (FIRST_TO_SECOND == typeOfConvert) {

             return convertFirstToSecond(value);

         } else if (SECOND_TO_FIRST == typeOfConvert) {

             return convertSecondToFirst(value);

         }

         throw new IllegalArgumentException("Unkown type of convert.");

     }

 }