<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Translation;

use Symfony\Component\Translation\Exception\InvalidArgumentException;

/**
 * TranslatorInterface.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
interface TranslatorInterface
{
    /**
     * Translates the given message.
     *
     * @param string      $id         The message id (may also be an object that can be cast to string)
     * @param array       $parameters An array of parameters for the message
     * @param string|null $domain     The domain for the message or null to use the default
     * @param string|null $locale     The locale or null to use the default
     *
     * @return string The translated string
     *
     * @throws InvalidArgumentException If the locale contains invalid characters
     */
    public function trans($id, array $parameters = array(), $domain = null, $locale = null);

    /**
     * Translates the given choice message by choosing a translation according to a number.
     *
     * @param string      $id         The message id (may also be an object that can be cast to string)
     * @param int         $number     The number to use to find the index of the message
     * @param array       $parameters An array of parameters for the message
     * @param string|null $domain     The domain for the message or null to use the default
     * @param string|null $locale     The locale or null to use the default
     *
     * @return string The translated string
     *
     * @throws InvalidArgumentException If the locale contains invalid characters
     */
    public function transChoice($id, $number, array $parameters = array(), $domain = null, $locale = null);

    /**
     * Sets the current locale.
     *
     * @param string $locale The locale
     *
     * @throws InvalidArgumentException If the locale contains invalid characters
     */
    public function setLocale($locale);

    /**
     * Returns the current locale.
     *
     * @return string The locale
     */
    public function getLocale();
}
