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CallbackStream.php
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CallbackStream.php
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<?php
declare(strict_types=1);
namespace Laminas\Diactoros;
use Psr\Http\Message\StreamInterface;
use function array_key_exists;
use const SEEK_SET;
/**
* Implementation of PSR HTTP streams
*/
class CallbackStream implements StreamInterface
{
/**
* @var callable|null
*/
protected $callback;
/**
* @param callable $callback
* @throws Exception\InvalidArgumentException
*/
public function __construct(callable $callback)
{
$this->attach($callback);
}
/**
* {@inheritdoc}
*/
public function __toString() : string
{
return $this->getContents();
}
/**
* {@inheritdoc}
*/
public function close() : void
{
$this->callback = null;
}
/**
* {@inheritdoc}
* @return null|callable
*/
public function detach() : ?callable
{
$callback = $this->callback;
$this->callback = null;
return $callback;
}
/**
* Attach a new callback to the instance.
*/
public function attach(callable $callback) : void
{
$this->callback = $callback;
}
/**
* {@inheritdoc}
*/
public function getSize() : ?int
{
return null;
}
/**
* {@inheritdoc}
*/
public function tell() : int
{
throw Exception\UntellableStreamException::forCallbackStream();
}
/**
* {@inheritdoc}
*/
public function eof() : bool
{
return empty($this->callback);
}
/**
* {@inheritdoc}
*/
public function isSeekable() : bool
{
return false;
}
/**
* {@inheritdoc}
* @param int $offset
* @param int $whence
* @return void
*/
public function seek($offset, $whence = SEEK_SET)
{
throw Exception\UnseekableStreamException::forCallbackStream();
}
/**
* {@inheritdoc}
*/
public function rewind() : void
{
throw Exception\UnrewindableStreamException::forCallbackStream();
}
/**
* {@inheritdoc}
*/
public function isWritable() : bool
{
return false;
}
/**
* {@inheritdoc}
*/
public function write($string) : void
{
throw Exception\UnwritableStreamException::forCallbackStream();
}
/**
* {@inheritdoc}
*/
public function isReadable() : bool
{
return false;
}
/**
* {@inheritdoc}
*/
public function read($length) : string
{
throw Exception\UnreadableStreamException::forCallbackStream();
}
/**
* {@inheritdoc}
*/
public function getContents() : string
{
$callback = $this->detach();
$contents = $callback ? $callback() : '';
return (string) $contents;
}
/**
* {@inheritdoc}
* @return mixed
*/
public function getMetadata($key = null)
{
$metadata = [
'eof' => $this->eof(),
'stream_type' => 'callback',
'seekable' => false
];
if (null === $key) {
return $metadata;
}
if (! array_key_exists($key, $metadata)) {
return null;
}
return $metadata[$key];
}
}