firefly-iii/app/Services/Currency/ExchangeRateInterface.php

<?php
/**
 * ExchangeRateInterface.php
 * Copyright (c) 2017 thegrumpydictator@gmail.com
 * This software may be modified and distributed under the terms of the Creative Commons Attribution-ShareAlike 4.0 International License.
 *
 * See the LICENSE file for details.
 */

declare(strict_types=1);

namespace FireflyIII\Services\Currency;


use Carbon\Carbon;
use FireflyIII\Models\CurrencyExchangeRate;
use FireflyIII\Models\TransactionCurrency;
use FireflyIII\User;

interface ExchangeRateInterface
{
    /**
     * @param TransactionCurrency $fromCurrency
     * @param TransactionCurrency $toCurrency
     * @param Carbon              $date
     *
     * @return CurrencyExchangeRate
     */
    public function getRate(TransactionCurrency $fromCurrency, TransactionCurrency $toCurrency, Carbon $date): CurrencyExchangeRate;

    /**
     * @param User $user
     *
     * @return mixed
     */
    public function setUser(User $user);

}