LazyOpenStream.php — Tutor LMS – eLearning and online course solution trunk

tutor / ecommerce / PaymentGateways / Paypal / vendor / guzzlehttp / psr7 / src / LazyOpenStream.php

tutor / ecommerce / PaymentGateways / Paypal / vendor / guzzlehttp / psr7 / src Last commit date

LazyOpenStream.php

50 lines

1	<?php
2
3	declare(strict_types=1);
4
5	namespace GuzzleHttp\Psr7;
6
7	use Psr\Http\Message\StreamInterface;
8
9	/**
10	* Lazily reads or writes to a file that is opened only after an IO operation
11	* take place on the stream.
12	*/
13	final class LazyOpenStream implements StreamInterface
14	{
15	use StreamDecoratorTrait;
16
17	/** @var string */
18	private $filename;
19
20	/** @var string */
21	private $mode;
22
23	/**
24	* @var StreamInterface
25	*/
26	private $stream;
27
28	/**
29	* @param string $filename File to lazily open
30	* @param string $mode fopen mode to use when opening the stream
31	*/
32	public function __construct(string $filename, string $mode)
33	{
34	$this->filename = $filename;
35	$this->mode = $mode;
36
37	// unsetting the property forces the first access to go through
38	// __get().
39	unset($this->stream);
40	}
41
42	/**
43	* Creates the underlying stream lazily when required.
44	*/
45	protected function createStream(): StreamInterface
46	{
47	return Utils::streamFor(Utils::tryFopen($this->filename, $this->mode));
48	}
49	}
50