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<?php
namespace Amp\ByteStream;
use Amp\Deferred;
use Amp\Promise;
use Amp\Success;
class OutputBuffer implements OutputStream, Promise
{
/** @var Deferred */
private $deferred;
/** @var string */
private $contents = '';
/** @var bool */
private $closed = false;
public function __construct()
{
$this->deferred = new Deferred;
}
public function write(string $data): Promise
{
if ($this->closed) {
throw new ClosedException("The stream has already been closed.");
}
$this->contents .= $data;
return new Success(\strlen($data));
}
public function end(string $finalData = ""): Promise
{
if ($this->closed) {
throw new ClosedException("The stream has already been closed.");
}
$this->contents .= $finalData;
$this->closed = true;
$this->deferred->resolve($this->contents);
$this->contents = "";
return new Success(\strlen($finalData));
}
public function onResolve(callable $onResolved)
{
$this->deferred->promise()->onResolve($onResolved);
}
}