Presence.java
/**
*
* Copyright 2003-2007 Jive Software.
*
* 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.smack.packet;
import java.util.Locale;
import org.jivesoftware.smack.util.Objects;
import org.jivesoftware.smack.util.TypedCloneable;
import org.jivesoftware.smack.util.XmlStringBuilder;
/**
* Represents XMPP presence packets. Every presence packet has a type, which is one of
* the following values:
* <ul>
* <li>{@link Presence.Type#available available} -- (Default) indicates the user is available to
* receive messages.
* <li>{@link Presence.Type#unavailable unavailable} -- the user is unavailable to receive messages.
* <li>{@link Presence.Type#subscribe subscribe} -- request subscription to recipient's presence.
* <li>{@link Presence.Type#subscribed subscribed} -- grant subscription to sender's presence.
* <li>{@link Presence.Type#unsubscribe unsubscribe} -- request removal of subscription to
* sender's presence.
* <li>{@link Presence.Type#unsubscribed unsubscribed} -- grant removal of subscription to
* sender's presence.
* <li>{@link Presence.Type#error error} -- the presence packet contains an error message.
* </ul><p>
*
* A number of attributes are optional:
* <ul>
* <li>Status -- free-form text describing a user's presence (i.e., gone to lunch).
* <li>Priority -- non-negative numerical priority of a sender's resource. The
* highest resource priority is the default recipient of packets not addressed
* to a particular resource.
* <li>Mode -- one of five presence modes: {@link Mode#available available} (the default),
* {@link Mode#chat chat}, {@link Mode#away away}, {@link Mode#xa xa} (extended away), and
* {@link Mode#dnd dnd} (do not disturb).
* </ul><p>
*
* Presence packets are used for two purposes. First, to notify the server of
* the user's current presence status. Second, they are used to subscribe and
* unsubscribe users from the roster.
*
* @author Matt Tucker
*/
public final class Presence extends Stanza implements TypedCloneable<Presence> {
public static final String ELEMENT = "presence";
private Type type = Type.available;
private String status = null;
private int priority = Integer.MIN_VALUE;
private Mode mode = null;
/**
* Creates a new presence update. Status, priority, and mode are left un-set.
*
* @param type the type.
*/
public Presence(Type type) {
setType(type);
}
/**
* Creates a new presence update with a specified status, priority, and mode.
*
* @param type the type.
* @param status a text message describing the presence update.
* @param priority the priority of this presence update.
* @param mode the mode type for this presence update.
*/
public Presence(Type type, String status, int priority, Mode mode) {
setType(type);
setStatus(status);
setPriority(priority);
setMode(mode);
}
/**
* Copy constructor.
* <p>
* This does not perform a deep clone, as extension elements are shared between the new and old
* instance.
* </p>
*
* @param other
*/
public Presence(Presence other) {
super(other);
this.type = other.type;
this.status = other.status;
this.priority = other.priority;
this.mode = other.mode;
}
/**
* Returns true if the {@link Type presence type} is available (online) and
* false if the user is unavailable (offline), or if this is a presence packet
* involved in a subscription operation. This is a convenience method
* equivalent to <tt>getType() == Presence.Type.available</tt>. Note that even
* when the user is available, their presence mode may be {@link Mode#away away},
* {@link Mode#xa extended away} or {@link Mode#dnd do not disturb}. Use
* {@link #isAway()} to determine if the user is away.
*
* @return true if the presence type is available.
*/
public boolean isAvailable() {
return type == Type.available;
}
/**
* Returns true if the presence type is {@link Type#available available} and the presence
* mode is {@link Mode#away away}, {@link Mode#xa extended away}, or
* {@link Mode#dnd do not disturb}. False will be returned when the type or mode
* is any other value, including when the presence type is unavailable (offline).
* This is a convenience method equivalent to
* <tt>type == Type.available && (mode == Mode.away || mode == Mode.xa || mode == Mode.dnd)</tt>.
*
* @return true if the presence type is available and the presence mode is away, xa, or dnd.
*/
public boolean isAway() {
return type == Type.available && (mode == Mode.away || mode == Mode.xa || mode == Mode.dnd);
}
/**
* Returns the type of this presence packet.
*
* @return the type of the presence packet.
*/
public Type getType() {
return type;
}
/**
* Sets the type of the presence packet.
*
* @param type the type of the presence packet.
*/
public void setType(Type type) {
this.type = Objects.requireNonNull(type, "Type cannot be null");
}
/**
* Returns the status message of the presence update, or <tt>null</tt> if there
* is not a status. The status is free-form text describing a user's presence
* (i.e., "gone to lunch").
*
* @return the status message.
*/
public String getStatus() {
return status;
}
/**
* Sets the status message of the presence update. The status is free-form text
* describing a user's presence (i.e., "gone to lunch").
*
* @param status the status message.
*/
public void setStatus(String status) {
this.status = status;
}
/**
* Returns the priority of the presence, or Integer.MIN_VALUE if no priority has been set.
*
* @return the priority.
*/
public int getPriority() {
return priority;
}
/**
* Sets the priority of the presence. The valid range is -128 through 128.
*
* @param priority the priority of the presence.
* @throws IllegalArgumentException if the priority is outside the valid range.
*/
public void setPriority(int priority) {
if (priority < -128 || priority > 128) {
throw new IllegalArgumentException("Priority value " + priority +
" is not valid. Valid range is -128 through 128.");
}
this.priority = priority;
}
/**
* Returns the mode of the presence update.
*
* @return the mode.
*/
public Mode getMode() {
if (mode == null) {
return Mode.available;
}
return mode;
}
/**
* Sets the mode of the presence update. A null presence mode value is interpreted
* to be the same thing as {@link Presence.Mode#available}.
*
* @param mode the mode.
*/
public void setMode(Mode mode) {
this.mode = mode;
}
@Override
public XmlStringBuilder toXML() {
XmlStringBuilder buf = new XmlStringBuilder();
buf.halfOpenElement(ELEMENT);
addCommonAttributes(buf);
if (type != Type.available) {
buf.attribute("type", type);
}
buf.rightAngleBracket();
buf.optElement("status", status);
if (priority != Integer.MIN_VALUE) {
buf.element("priority", Integer.toString(priority));
}
if (mode != null && mode != Mode.available) {
buf.element("show", mode);
}
buf.append(getExtensionsXML());
// Add the error sub-packet, if there is one.
appendErrorIfExists(buf);
buf.closeElement(ELEMENT);
return buf;
}
/**
* Creates and returns a copy of this presence stanza.
* <p>
* This does not perform a deep clone, as extension elements are shared between the new and old
* instance.
* </p>
* @return a clone of this presence.
*/
@Override
public Presence clone() {
return new Presence(this);
}
/**
* An enum to represent the presence type. Note that presence type is often confused
* with presence mode. Generally, if a user is signed in to a server, they have a presence
* type of {@link #available available}, even if the mode is {@link Mode#away away},
* {@link Mode#dnd dnd}, etc. The presence type is only {@link #unavailable unavailable} when
* the user is signing out of the server.
*/
public enum Type {
/**
* The user is available to receive messages (default).
*/
available,
/**
* The user is unavailable to receive messages.
*/
unavailable,
/**
* Request subscription to recipient's presence.
*/
subscribe,
/**
* Grant subscription to sender's presence.
*/
subscribed,
/**
* Request removal of subscription to sender's presence.
*/
unsubscribe,
/**
* Grant removal of subscription to sender's presence.
*/
unsubscribed,
/**
* The presence packet contains an error message.
*/
error,
/**
* A presence probe as defined in section 4.3 of RFC 6121
*/
probe,
;
/**
* Converts a String into the corresponding types. Valid String values that can be converted
* to types are: "available", "unavailable", "subscribe", "subscribed", "unsubscribe",
* "unsubscribed" and "error".
*
* @param string the String value to covert.
* @return the corresponding Type.
* @throws IllegalArgumentException when not able to parse the string parameter
* @throws NullPointerException if the string is null
*/
public static Type fromString(String string) {
return Type.valueOf(string.toLowerCase(Locale.US));
}
}
/**
* An enum to represent the presence mode.
*/
public enum Mode {
/**
* Free to chat.
*/
chat,
/**
* Available (the default).
*/
available,
/**
* Away.
*/
away,
/**
* Away for an extended period of time.
*/
xa,
/**
* Do not disturb.
*/
dnd;
/**
* Converts a String into the corresponding types. Valid String values that can be converted
* to types are: "chat", "available", "away", "xa", and "dnd".
*
* @param string the String value to covert.
* @return the corresponding Type.
* @throws IllegalArgumentException when not able to parse the string parameter
* @throws NullPointerException if the string is null
*/
public static Mode fromString(String string) {
return Mode.valueOf(string.toLowerCase(Locale.US));
}
}
}