private boolean isConfigured() {
        return maxChars > -1 || maxStanzas > -1 || seconds > -1 || since != null;
    }
Returns true if the history has been configured with some values.

@return true if the history has been configured with some values.
xmppserver/src/main/java/org/jivesoftware/openfire/muc/HistoryRequest.java