Method close

app/src/main/java/com/sun/mail/pop3/POP3Folder.java:230–288

(boolean expunge)

    }

    @Override
    public synchronized void close(boolean expunge) throws MessagingException {
	checkOpen();

	try {
	    /*
	     * Some POP3 servers will mark messages for deletion when
	     * they're read.  To prevent such messages from being
	     * deleted before the client deletes them, you can set
	     * the mail.pop3.rsetbeforequit property to true.  This
	     * causes us to issue a POP3 RSET command to clear all
	     * the "marked for deletion" flags.  We can then explicitly
	     * delete messages as desired.
	     */
	    if (store.rsetBeforeQuit && !forceClose)
		port.rset();
	    POP3Message m;
	    if (expunge && mode == READ_WRITE && !forceClose) {
		// find all messages marked deleted and issue DELE commands
		for (int i = 0; i < message_cache.length; i++) {
		    if ((m = message_cache[i]) != null) {
			if (m.isSet(Flags.Flag.DELETED))
			    try {
				port.dele(i + 1);
			    } catch (IOException ioex) {
				throw new MessagingException(
				    "Exception deleting messages during close",
				    ioex);
			    }
		    }
		}
	    }

	    /*
	     * Flush and free all cached data for the messages.
	     */
	    for (int i = 0; i < message_cache.length; i++) {
		if ((m = message_cache[i]) != null)
		    m.invalidate(true);
	    }

	    if (forceClose)
		port.close();
	    else
		port.quit();
	} catch (IOException ex) {
	    // do nothing
	} finally {
	    port = null;
	    store.closePort(this);
	    message_cache = null;
	    opened = false;
	    notifyConnectionListeners(ConnectionEvent.CLOSED);
	    if (fileCache != null) {
		fileCache.close();
		fileCache = null;
	    }
	}