/**
* Makes this mapping to a multiple.
*
* @param Mapping $mapping The mapping object
*
* @return Mapping
*/
public function multiple(Mapping $proto)
{
$emitter = new Emitter();
$mapping = new Mapping($emitter, $proto->getExtensions());
$emitter->on(Events::APPLY, function (Data $data) use($mapping, $proto) {
if (null === $data->getInput()) {
$data->setInput([]);
}
$this->resize($mapping, $proto, $data->getInput());
});
$emitter->on(Events::UNAPPLY, function (Data $data) use($mapping, $proto) {
$this->resize($mapping, $proto, $data->getInput());
});
return $mapping;
}
