@Override
    public int compareTo(PrivacyItem other) {
        return this.order - other.order;
    }
Returns true if this privacy item needs the user roster to figure out
if a packet must be blocked.

@return true if this privacy item needs the user roster to figure out
        if a packet must be blocked.
xmppserver/src/main/java/org/jivesoftware/openfire/privacy/PrivacyItem.java