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<?php
namespace Amp\ByteStream;
use Amp\Promise;
use Amp\Success;
/**
* Input stream with a single already known data chunk.
*/
final class InMemoryStream implements InputStream
{
private $contents;
/**
* @param string|null $contents Data chunk or `null` for no data chunk.
*/
public function __construct(string $contents = null)
{
$this->contents = $contents;
}
/**
* Reads data from the stream.
*
* @return Promise<string|null> Resolves with the full contents or `null` if the stream has closed / already been consumed.
*/
public function read(): Promise
{
if ($this->contents === null) {
return new Success;
}
$promise = new Success($this->contents);
$this->contents = null;
return $promise;
}
}