LazyOpenStream.php
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LazyOpenStream.php
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	<?php

	declare(strict_types=1);

	namespace GuzzleHttp\Psr7;

	use Psr\Http\Message\StreamInterface;

	/**
	* Lazily reads or writes to a file that is opened only after an IO operation
	* take place on the stream.
	*/
	final class LazyOpenStream implements StreamInterface
	{
	use StreamDecoratorTrait;

	/** @var string */
	private $filename;

	/** @var string */
	private $mode;

	/**
	* @var StreamInterface
	*/
	private $stream;

	/**
	* @param string $filename File to lazily open
	* @param string $mode fopen mode to use when opening the stream
	*/
	public function __construct(string $filename, string $mode)
	{
	$this->filename = $filename;
	$this->mode = $mode;

	// unsetting the property forces the first access to go through
	// __get().
	unset($this->stream);
	}

	/**
	* Creates the underlying stream lazily when required.
	*/
	protected function createStream(): StreamInterface
	{
	return Utils::streamFor(Utils::tryFopen($this->filename, $this->mode));
	}
	}