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Smack extensions. Classes and methods that implement support for the various XMPP XEPs (Multi-User Chat, PubSub, …) and other XMPP extensions.

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/**
 *
 * Copyright the original author or authors
 *
 * 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.pubsub.packet;

import org.jivesoftware.smack.packet.ExtensionElement;
import org.jivesoftware.smack.packet.IQ;

import org.jivesoftware.smackx.pubsub.NodeExtension;
import org.jivesoftware.smackx.pubsub.PubSubElementType;

import org.jxmpp.jid.Jid;

/**
 * The standard PubSub extension of an {@link IQ} packet.  This is the topmost
 * element of all pubsub requests and replies as defined in the Publish-Subscribe
 * specification.
 *
 * @author Robin Collier
 */
public class PubSub extends IQ {
    public static final String ELEMENT = "pubsub";
    public static final String NAMESPACE = "http://jabber.org/protocol/pubsub";

    public PubSub() {
        super(ELEMENT, NAMESPACE);
    }

    public PubSub(PubSubNamespace ns) {
        super(ELEMENT, ns.getXmlns());
    }

    public PubSub(Jid to, Type type, PubSubNamespace ns) {
        super(ELEMENT, (ns == null ? PubSubNamespace.basic : ns).getXmlns());
        setTo(to);
        setType(type);
    }

    @SuppressWarnings("unchecked")
    public  PE getExtension(PubSubElementType elem) {
        return (PE) getExtension(elem.getElementName(), elem.getNamespace().getXmlns());
    }

    /**
     * Returns the XML representation of a pubsub element according the specification.
     *
     * The XML representation will be inside of an iq stanza like
     * in the following example:
     *      * <iq type='set' id="MlIpV-4" to="pubsub.gato.home" from="[email protected]/Smack">
     *     <pubsub xmlns="http://jabber.org/protocol/pubsub">
     *                      :
     *         Specific request extension
     *                      :
     *     </pubsub>
     * </iq>
     * 
     *
     */
    @Override
    protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
        // N.B. We could use SimpleIQ here, but PubSub IQs will nearly *always* have packet extensions, which means that
        // SimpleIQs xml.setEmptyElement() is counter-productive in this case and we use xml.rightAngleBracket()
        // instead, as there are likely sub-elements to follow.
        xml.rightAngleBracket();
        return xml;
    }

    public static PubSub createPubsubPacket(Jid to, Type type, NodeExtension extension) {
        PubSub pubSub = new PubSub(to, type, extension.getPubSubNamespace());
        pubSub.addExtension(extension);
        return pubSub;
    }
}