package org.apidesign.apifest08.currency;

public final class CurrencyRateImpl implements CurrencyRate {

    private String currency1;

    private String currency2;

    private Rate rate;

    CurrencyRateImpl(final String currency1, final String currency2, final Rate rate) {

        if ((currency1 == null)||(currency2 == null) || (rate == null)) {

            throw new IllegalArgumentException("Argument cannot be null.");

        }

        if ("".equals(currency1) || "".equals(currency2)) {

            throw new IllegalArgumentException("Name of currency cannot be empty string");

        }

        if (currency1.equals(currency2)) {

            throw new IllegalArgumentException("Currencies in rate cannot be the same");

        }

        this.currency1 = currency1;

        this.currency2 = currency2;

        this.rate = rate;

    }

    public String getCurrency1() {

        return currency1;

    }

    public String getCurrency2() {

        return currency2;

    }

    public Rate getRate(){

        return rate;

    }

}