/** * * Copyright 2003-2007 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.packet; import org.jivesoftware.smack.packet.PacketExtension; import java.util.ArrayList; import java.util.Iterator; /** * Represents message events relating to the delivery, display, composition and cancellation of * messages.

* * There are four message events currently defined in this namespace: *

    *
  1. Offline
    * Indicates that the message has been stored offline by the intended recipient's server. This * event is triggered only if the intended recipient's server supports offline storage, has that * support enabled, and the recipient is offline when the server receives the message for delivery.
  2. * *
  3. Delivered
    * Indicates that the message has been delivered to the recipient. This signifies that the message * has reached the recipient's XMPP client, but does not necessarily mean that the message has * been displayed. This event is to be raised by the XMPP client.
  4. * *
  5. Displayed
    * Once the message has been received by the recipient's XMPP client, it may be displayed to the * user. This event indicates that the message has been displayed, and is to be raised by the * XMPP client. Even if a message is displayed multiple times, this event should be raised only * once.
  6. * *
  7. Composing
    * In threaded chat conversations, this indicates that the recipient is composing a reply to a * message. The event is to be raised by the recipient's XMPP client. A XMPP client is allowed * to raise this event multiple times in response to the same request, providing the original * event is cancelled first.
  8. *
* * @author Gaston Dombiak */ public class MessageEvent implements PacketExtension { public static final String OFFLINE = "offline"; public static final String COMPOSING = "composing"; public static final String DISPLAYED = "displayed"; public static final String DELIVERED = "delivered"; public static final String CANCELLED = "cancelled"; private boolean offline = false; private boolean delivered = false; private boolean displayed = false; private boolean composing = false; private boolean cancelled = true; private String packetID = null; /** * Returns the XML element name of the extension sub-packet root element. * Always returns "x" * * @return the XML element name of the packet extension. */ public String getElementName() { return "x"; } /** * Returns the XML namespace of the extension sub-packet root element. * According the specification the namespace is always "jabber:x:event" * * @return the XML namespace of the packet extension. */ public String getNamespace() { return "jabber:x:event"; } /** * When the message is a request returns if the sender of the message requests to be notified * when the receiver is composing a reply. * When the message is a notification returns if the receiver of the message is composing a * reply. * * @return true if the sender is requesting to be notified when composing or when notifying * that the receiver of the message is composing a reply */ public boolean isComposing() { return composing; } /** * When the message is a request returns if the sender of the message requests to be notified * when the message is delivered. * When the message is a notification returns if the message was delivered or not. * * @return true if the sender is requesting to be notified when delivered or when notifying * that the message was delivered */ public boolean isDelivered() { return delivered; } /** * When the message is a request returns if the sender of the message requests to be notified * when the message is displayed. * When the message is a notification returns if the message was displayed or not. * * @return true if the sender is requesting to be notified when displayed or when notifying * that the message was displayed */ public boolean isDisplayed() { return displayed; } /** * When the message is a request returns if the sender of the message requests to be notified * when the receiver of the message is offline. * When the message is a notification returns if the receiver of the message was offline. * * @return true if the sender is requesting to be notified when offline or when notifying * that the receiver of the message is offline */ public boolean isOffline() { return offline; } /** * When the message is a notification returns if the receiver of the message cancelled * composing a reply. * * @return true if the receiver of the message cancelled composing a reply */ public boolean isCancelled() { return cancelled; } /** * Returns the unique ID of the message that requested to be notified of the event. * The packet id is not used when the message is a request for notifications * * @return the message id that requested to be notified of the event. */ public String getPacketID() { return packetID; } /** * Returns the types of events. The type of event could be: * "offline", "composing","delivered","displayed", "offline" * * @return an iterator over all the types of events of the MessageEvent. */ public Iterator getEventTypes() { ArrayList allEvents = new ArrayList(); if (isDelivered()) { allEvents.add(MessageEvent.DELIVERED); } if (!isMessageEventRequest() && isCancelled()) { allEvents.add(MessageEvent.CANCELLED); } if (isComposing()) { allEvents.add(MessageEvent.COMPOSING); } if (isDisplayed()) { allEvents.add(MessageEvent.DISPLAYED); } if (isOffline()) { allEvents.add(MessageEvent.OFFLINE); } return allEvents.iterator(); } /** * When the message is a request sets if the sender of the message requests to be notified * when the receiver is composing a reply. * When the message is a notification sets if the receiver of the message is composing a * reply. * * @param composing sets if the sender is requesting to be notified when composing or when * notifying that the receiver of the message is composing a reply */ public void setComposing(boolean composing) { this.composing = composing; setCancelled(false); } /** * When the message is a request sets if the sender of the message requests to be notified * when the message is delivered. * When the message is a notification sets if the message was delivered or not. * * @param delivered sets if the sender is requesting to be notified when delivered or when * notifying that the message was delivered */ public void setDelivered(boolean delivered) { this.delivered = delivered; setCancelled(false); } /** * When the message is a request sets if the sender of the message requests to be notified * when the message is displayed. * When the message is a notification sets if the message was displayed or not. * * @param displayed sets if the sender is requesting to be notified when displayed or when * notifying that the message was displayed */ public void setDisplayed(boolean displayed) { this.displayed = displayed; setCancelled(false); } /** * When the message is a request sets if the sender of the message requests to be notified * when the receiver of the message is offline. * When the message is a notification sets if the receiver of the message was offline. * * @param offline sets if the sender is requesting to be notified when offline or when * notifying that the receiver of the message is offline */ public void setOffline(boolean offline) { this.offline = offline; setCancelled(false); } /** * When the message is a notification sets if the receiver of the message cancelled * composing a reply. * The Cancelled event is never requested explicitly. It is requested implicitly when * requesting to be notified of the Composing event. * * @param cancelled sets if the receiver of the message cancelled composing a reply */ public void setCancelled(boolean cancelled) { this.cancelled = cancelled; } /** * Sets the unique ID of the message that requested to be notified of the event. * The packet id is not used when the message is a request for notifications * * @param packetID the message id that requested to be notified of the event. */ public void setPacketID(String packetID) { this.packetID = packetID; } /** * Returns true if this MessageEvent is a request for notifications. * Returns false if this MessageEvent is a notification of an event. * * @return true if this message is a request for notifications. */ public boolean isMessageEventRequest() { return this.packetID == null; } /** * Returns the XML representation of a Message Event according the specification. * * Usually the XML representation will be inside of a Message XML representation like * in the following examples:

* * Request to be notified when displayed: *

     * <message
     *    to='romeo@montague.net/orchard'
     *    from='juliet@capulet.com/balcony'
     *    id='message22'>
     * <x xmlns='jabber:x:event'>
     *   <displayed/>
     * </x>
     * </message>
     * 
* * Notification of displayed: *
     * <message
     *    from='romeo@montague.net/orchard'
     *    to='juliet@capulet.com/balcony'>
     * <x xmlns='jabber:x:event'>
     *   <displayed/>
     *   <id>message22</id>
     * </x>
     * </message>
     * 
* */ public String toXML() { StringBuilder buf = new StringBuilder(); buf.append("<").append(getElementName()).append(" xmlns=\"").append(getNamespace()).append( "\">"); // Note: Cancellation events don't specify any tag. They just send the packetID // Add the offline tag if the sender requests to be notified of offline events or if // the target is offline if (isOffline()) buf.append("<").append(MessageEvent.OFFLINE).append("/>"); // Add the delivered tag if the sender requests to be notified when the message is // delivered or if the target notifies that the message has been delivered if (isDelivered()) buf.append("<").append(MessageEvent.DELIVERED).append("/>"); // Add the displayed tag if the sender requests to be notified when the message is // displayed or if the target notifies that the message has been displayed if (isDisplayed()) buf.append("<").append(MessageEvent.DISPLAYED).append("/>"); // Add the composing tag if the sender requests to be notified when the target is // composing a reply or if the target notifies that he/she is composing a reply if (isComposing()) buf.append("<").append(MessageEvent.COMPOSING).append("/>"); // Add the id tag only if the MessageEvent is a notification message (not a request) if (getPacketID() != null) buf.append("").append(getPacketID()).append(""); buf.append(""); return buf.toString(); } }