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/**
* Copyright 2013 Georg Lukas
*
* All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smackx.forward;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smack.provider.PacketExtensionProvider;
import org.jivesoftware.smack.util.PacketParserUtils;
import org.jivesoftware.smackx.packet.DelayInfo;
import org.jivesoftware.smackx.provider.DelayInfoProvider;
import org.xmlpull.v1.XmlPullParser;
/**
* Packet extension for XEP-0297: Stanza Forwarding. This class implements
* the packet extension and a {@link PacketExtensionProvider} to parse
* forwarded messages from a packet. The extension
* <a href="http://xmpp.org/extensions/xep-0297.html">XEP-0297</a> is
* a prerequisite for XEP-0280 (Message Carbons).
*
* <p>The {@link Forwarded.Provider} must be registered in the
* <b>smack.properties</b> file for the element <b>forwarded</b> with
* namespace <b>urn:xmpp:forwarded:0</b></p> to be used.
*
* @author Georg Lukas
*/
public class Forwarded implements PacketExtension {
public static final String NAMESPACE = "urn:xmpp:forward:0";
public static final String ELEMENT_NAME = "forwarded";
private DelayInfo delay;
private Packet forwardedPacket;
/**
* Creates a new Forwarded packet extension.
*
* @param delay an optional {@link DelayInfo} timestamp of the packet.
* @param fwdPacket the packet that is forwarded (required).
*/
public Forwarded(DelayInfo delay, Packet fwdPacket) {
this.delay = delay;
this.forwardedPacket = fwdPacket;
}
@Override
public String getElementName() {
return ELEMENT_NAME;
}
@Override
public String getNamespace() {
return NAMESPACE;
}
@Override
public String toXML() {
StringBuilder buf = new StringBuilder();
buf.append("<").append(getElementName()).append(" xmlns=\"")
.append(getNamespace()).append("\">");
if (delay != null)
buf.append(delay.toXML());
buf.append(forwardedPacket.toXML());
buf.append("</").append(getElementName()).append(">");
return buf.toString();
}
/**
* get the packet forwarded by this stanza.
*
* @return the {@link Packet} instance (typically a message) that was forwarded.
*/
public Packet getForwardedPacket() {
return forwardedPacket;
}
/**
* get the timestamp of the forwarded packet.
*
* @return the {@link DelayInfo} representing the time when the original packet was sent. May be null.
*/
public DelayInfo getDelayInfo() {
return delay;
}
public static class Provider implements PacketExtensionProvider {
DelayInfoProvider dip = new DelayInfoProvider();
public PacketExtension parseExtension(XmlPullParser parser) throws Exception {
DelayInfo di = null;
Packet packet = null;
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
if (parser.getName().equals("delay"))
di = (DelayInfo)dip.parseExtension(parser);
else if (parser.getName().equals("message"))
packet = PacketParserUtils.parseMessage(parser);
else throw new Exception("Unsupported forwarded packet type: " + parser.getName());
}
else if (eventType == XmlPullParser.END_TAG && parser.getName().equals(ELEMENT_NAME))
done = true;
}
if (packet == null)
throw new Exception("forwarded extension must contain a packet");
return new Forwarded(di, packet);
}
}
}
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