Way to check the name of the field used for uploading documents

[zyON]

I'm using hooks to process documents after the upload on a page. 

I've 3 different fields that can be used for uploading documents like "photos", "pdfs", "floorplans". 

How can I know which field on the page activated the hook so I can process them differently?

Thanks.

[zyON]

Ok, found it:

Using a InputfieldFile::fileAdded hook that returns a pageFile object:

public function addFile($event){
$file = $event->arguments(0); // file uploaded
$field = $file->field->name; // name of the field on the page used for uploading the file
(...)
}