Method toUIDSet

app/src/main/java/com/sun/mail/imap/Utility.java:148–191

Return UIDSets for the messages. Note that the UIDs must have already been fetched for the messages. @param msgs the messages @return the UIDSet array

(Message[] msgs)

     * @return		the UIDSet array
     */
    public static UIDSet[] toUIDSet(Message[] msgs) {
	List<UIDSet> v = new ArrayList<>(1);
	long current, next;

	IMAPMessage msg;
	for (int i = 0; i < msgs.length; i++) {
	    msg = (IMAPMessage)msgs[i];
	    if (msg.isExpunged()) // expunged message, skip it
		continue;

	    current = msg.getUID();
 
	    UIDSet set = new UIDSet();
	    set.start = current;

	    // Look for contiguous UIDs
	    for (++i; i < msgs.length; i++) {
		// get next message
		msg = (IMAPMessage)msgs[i];

		if (msg.isExpunged()) // expunged message, skip it
		    continue;
		next = msg.getUID();

		if (next == current+1)
		    current = next;
		else { // break in sequence
		    // We need to reexamine this message at the top of
		    // the outer loop, so decrement 'i' to cancel the
		    // outer loop's autoincrement 
		    i--;
		    break;
		}
	    }
	    set.end = current;
	    v.add(set);
	}

	if (v.isEmpty()) // No valid messages
	    return null;
	else {
	    return v.toArray(new UIDSet[v.size()]);
	}
    }

    /**
     * Make the ResyncData UIDSet available to IMAPProtocol,