title: what type of interface we will need that will read the file extension of the uploaded file then call the necessary java file
body: <p>what type of interface we will need that will read the file extension of the uploaded file then call the  necessary java file. For example: If you uploaded "hello.pdf" then it will call the pdf.java(which will clear the metadata). I don't know if this is clear but, let me know if you get what i am saying.</p>