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.");

    }

}