001/**
002 *
003 * Copyright 2015 Florian Schmaus
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package org.jivesoftware.smack.roster;
019
020import org.jivesoftware.smack.packet.Presence;
021import org.jxmpp.jid.Jid;
022
023
024/**
025 * Handle incoming requests to subscribe to our presence.
026 *
027 */
028public interface SubscribeListener {
029
030    public enum SubscribeAnswer {
031        Approve,
032        Deny,
033    }
034
035    /**
036     * Handle incoming presence subscription requests.
037     *
038     * @param from the JID requesting the subscription.
039     * @param subscribeRequest the presence stanza used for the request.
040     * @return a answer to the request, or <code>null</code>
041     */
042    public SubscribeAnswer processSubscribe(Jid from, Presence subscribeRequest);
043
044}