org.jivesoftware.smackx.muc.DeafOccupantInterceptor Maven / Gradle / Ivy

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Smack is an Open Source XMPP (Jabber) client library for instant messaging and presence. This library provides the client side functionality as specified in the core XMPP specifications as related to the client side of said specifications.

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/**
 * $RCSfile$
 * $Revision:  $
 * $Date: $
 *
 * Copyright 2003-2006 Jive Software.
 *
 * 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.muc;

import org.jivesoftware.smack.PacketInterceptor;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smack.packet.Presence;

/**
 * Packet interceptor that will intercept presence packets sent to the MUC service to indicate
 * that the user wants to be a deaf occupant. A user can only indicate that he wants to be a
 * deaf occupant while joining the room. It is not possible to become deaf or stop being deaf
 * after the user joined the room.
 *
 * Deaf occupants will not get messages broadcasted to all room occupants. However, they will
 * be able to get private messages, presences, IQ packets or room history. To use this
 * functionality you will need to send the message
 * {@link MultiUserChat#addPresenceInterceptor(org.jivesoftware.smack.PacketInterceptor)} and
 * pass this interceptor as the parameter.
 *
 * Note that this is a custom extension to the MUC service so it may not work with other servers
 * than Wildfire.
 *
 * @author Gaston Dombiak
 */
public class DeafOccupantInterceptor implements PacketInterceptor {

    public void interceptPacket(Packet packet) {
        Presence presence = (Presence) packet;
        // Check if user is joining a room
        if (Presence.Type.available == presence.getType() &&
                presence.getExtension("x", "http://jabber.org/protocol/muc") != null) {
            // Add extension that indicates that user wants to be a deaf occupant
            packet.addExtension(new DeafExtension());
        }
    }

    private static class DeafExtension implements PacketExtension {

        public String getElementName() {
            return "x";
        }

        public String getNamespace() {
            return "http://jivesoftware.org/protocol/muc";
        }

        public String toXML() {
            StringBuilder buf = new StringBuilder();
            buf.append("<").append(getElementName()).append(" xmlns=\"").append(getNamespace())
                    .append("\">");
            buf.append("");
            buf.append("");
            return buf.toString();
        }
    }
}