1<?php
2/**
3 * Zend Framework (http://framework.zend.com/)
4 *
5 * @link      http://github.com/zendframework/zf2 for the canonical source repository
6 * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
7 * @license   http://framework.zend.com/license/new-bsd New BSD License
8 */
9
10namespace Zend\Http\Header;
11
12/**
13 * @throws Exception\InvalidArgumentException
14 * @see http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.31
15 */
16class MaxForwards implements HeaderInterface
17{
18    /**
19     * @var string
20     */
21    protected $value;
22
23    public static function fromString($headerLine)
24    {
25        list($name, $value) = GenericHeader::splitHeaderLine($headerLine);
26
27        // check to ensure proper header type for this factory
28        if (strtolower($name) !== 'max-forwards') {
29            throw new Exception\InvalidArgumentException(sprintf(
30                'Invalid header line for Max-Forwards string: "%s"',
31                $name
32            ));
33        }
34
35        // @todo implementation details
36        $header = new static($value);
37
38        return $header;
39    }
40
41    public function __construct($value = null)
42    {
43        if ($value) {
44            HeaderValue::assertValid($value);
45            $this->value = $value;
46        }
47    }
48
49    public function getFieldName()
50    {
51        return 'Max-Forwards';
52    }
53
54    public function getFieldValue()
55    {
56        return $this->value;
57    }
58
59    public function toString()
60    {
61        return 'Max-Forwards: ' . $this->getFieldValue();
62    }
63}
64