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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));
}
}
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