/**
* Add a stream to the AppendStream
*
* @param StreamInterface $stream Stream to append. Must be readable.
*
* @throws \InvalidArgumentException if the stream is not readable
*/
public function addStream(StreamInterface $stream)
{
if (!$stream->isReadable()) {
throw new \InvalidArgumentException('Each stream must be readable');
}
// The stream is only seekable if all streams are seekable
if (!$stream->isSeekable()) {
$this->seekable = false;
}
$this->streams[] = $stream;
}
/**
* {@inheritdoc}
*/
protected function doIsReadable()
{
return $this->stream->isReadable();
}
