<?php
/**
 * @see       https://github.com/zendframework/zend-i18n for the canonical source repository
 * @copyright Copyright (c) 2005-2019 Zend Technologies USA Inc. (https://www.zend.com)
 * @license   https://github.com/zendframework/zend-i18n/blob/master/LICENSE.md New BSD License
 */

namespace Zend\I18n\View\Helper;

use Zend\I18n\Exception;

/**
 * View helper for translating messages.
 */
class Translate extends AbstractTranslatorHelper
{
    /**
     * Translate a message
     *
     * @param  string      $message
     * @param  string|null $textDomain
     * @param  string|null $locale
     * @throws Exception\RuntimeException
     * @return string
     */
    public function __invoke($message, $textDomain = null, $locale = null)
    {
        $translator = $this->getTranslator();
        if (null === $translator) {
            throw new Exception\RuntimeException('Translator has not been set');
        }
        if (null === $textDomain) {
            $textDomain = $this->getTranslatorTextDomain();
        }

        return $translator->translate($message, $textDomain, $locale);
    }
}