LogLevel.php

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<?php
namespace TYPO3\CMS\Core\Log;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

class LogLevel
{
    const EMERGENCY = 0;

    const ALERT = 1;

    const CRITICAL = 2;

    const ERROR = 3;

    const WARNING = 4;

    const NOTICE = 5;

    const INFO = 6;

    const DEBUG = 7;

    protected static $levels = [
        self::EMERGENCY => 'EMERGENCY',
        self::ALERT => 'ALERT',
        self::CRITICAL => 'CRITICAL',
        self::ERROR => 'ERROR',
        self::WARNING => 'WARNING',
        self::NOTICE => 'NOTICE',
        self::INFO => 'INFO',
        self::DEBUG => 'DEBUG'
    ];

    public static function getName($level)
    {
        self::validateLevel($level);
        return self::$levels[$level];
    }

    public static function isValidLevel($level)
    {
        return \TYPO3\CMS\Core\Utility\MathUtility::isIntegerInRange($level, self::EMERGENCY, self::DEBUG);
    }

    public static function validateLevel($level)
    {
        if (!self::isValidLevel($level)) {
            throw new \Psr\Log\InvalidArgumentException('Invalid Log Level.', 1321637121);
        }
    }

    public static function normalizeLevel($level)
    {
        if (is_string($level) && defined(__CLASS__ . '::' . strtoupper($level))) {
            $level = constant(__CLASS__ . '::' . strtoupper($level));
        }

        return $level;
    }
}