/**
* Creates a new SortReader using the passed in Reader for instantiation.
*
* @param Reader $rdr
* A Reader object providing the underlying stream. Must not be
* <code>null</code>.
*
* @return SortFilter a new filter based on this configuration, but filtering the
* specified reader
*/
public function chain(Reader $rdr)
{
$newFilter = new SortFilter($rdr);
$newFilter->setReverse($this->isReverse());
$newFilter->setInitialized(true);
return $newFilter;
}
