Method getProtocol

app/src/main/java/com/sun/mail/pop3/POP3Folder.java:590–595

Centralize access to the Protocol object by POP3Message objects so that they will fail appropriately when the folder is closed.

()

     * is closed.
     */
    Protocol getProtocol() throws MessagingException {
	Protocol p = port;	// read it before close() can set it to null
	checkOpen();
	// close() might happen here
	return p;
    }

    /*
     * Only here to make accessible to POP3Message.