NilTrait.php

<?php


/**
 * This file is part of the ramsey/uuid library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
 * @license http://opensource.org/licenses/MIT MIT
 */
declare (strict_types=1);
namespace Ramsey\Uuid\Rfc4122;


/**
 * Provides common functionality for nil UUIDs
 *
 * The nil UUID is special form of UUID that is specified to have all 128 bits
 * set to zero.
 *
 * @link https://tools.ietf.org/html/rfc4122#section-4.1.7 RFC 4122, § 4.1.7: Nil UUID
 *
 * @psalm-immutable
 */
trait NilTrait {
    
    /**
     * Returns the bytes that comprise the fields
     */
    public abstract function getBytes() : string;
    
    /**
     * Returns true if the byte string represents a nil UUID
     */
    public function isNil() : bool {
        return $this->getBytes() === "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
    }

}