1/**
2 * Copyright 2012 Florian Schmaus
3 *
4 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package org.jivesoftware.smackx.ping.packet;
18
19import org.jivesoftware.smack.packet.IQ;
20
21public class Pong extends IQ {
22
23    /**
24     * Composes a Pong packet from a received ping packet. This basically swaps
25     * the 'from' and 'to' attributes. And sets the IQ type to result.
26     *
27     * @param ping
28     */
29    public Pong(Ping ping) {
30        setType(IQ.Type.RESULT);
31        setFrom(ping.getTo());
32        setTo(ping.getFrom());
33        setPacketID(ping.getPacketID());
34    }
35
36    /*
37     * Returns the child element of the Pong reply, which is non-existent. This
38     * is why we return 'null' here. See e.g. Example 11 from
39     * http://xmpp.org/extensions/xep-0199.html#e2e
40     */
41    public String getChildElementXML() {
42        return null;
43    }
44
45}
46