/**
* $RCSfile$
* $Revision: 7071 $
* $Date: 2007-02-12 08:59:05 +0800 (Mon, 12 Feb 2007) $
*
* 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.IQ;
import org.jivesoftware.smack.util.StringUtils;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* A DiscoverItems IQ packet, which is used by XMPP clients to request and receive items
* associated with XMPP entities.<p>
*
* The items could also be queried in order to discover if they contain items inside. Some items
* may be addressable by its JID and others may require to be addressed by a JID and a node name.
*
* @author Gaston Dombiak
*/
public class DiscoverItems extends IQ {
public static final String NAMESPACE = "http://jabber.org/protocol/disco#items";
private final List<Item> items = new CopyOnWriteArrayList<Item>();
private String node;
/**
* Adds a new item to the discovered information.
*
* @param item the discovered entity's item
*/
public void addItem(Item item) {
synchronized (items) {
items.add(item);
}
}
/**
* Adds a collection of items to the discovered information. Does nothing if itemsToAdd is null
*
* @param itemsToAdd
*/
public void addItems(Collection<Item> itemsToAdd) {
if (itemsToAdd == null) return;
for (Item i : itemsToAdd) {
addItem(i);
}
}
/**
* Returns the discovered items of the queried XMPP entity.
*
* @return an Iterator on the discovered entity's items
*/
public Iterator<DiscoverItems.Item> getItems() {
synchronized (items) {
return Collections.unmodifiableList(items).iterator();
}
}
/**
* Returns the node attribute that supplements the 'jid' attribute. A node is merely
* something that is associated with a JID and for which the JID can provide information.<p>
*
* Node attributes SHOULD be used only when trying to provide or query information which
* is not directly addressable.
*
* @return the node attribute that supplements the 'jid' attribute
*/
public String getNode() {
return node;
}
/**
* Sets the node attribute that supplements the 'jid' attribute. A node is merely
* something that is associated with a JID and for which the JID can provide information.<p>
*
* Node attributes SHOULD be used only when trying to provide or query information which
* is not directly addressable.
*
* @param node the node attribute that supplements the 'jid' attribute
*/
public void setNode(String node) {
this.node = node;
}
public String getChildElementXML() {
StringBuilder buf = new StringBuilder();
buf.append("<query xmlns=\"" + NAMESPACE + "\"");
if (getNode() != null) {
buf.append(" node=\"");
buf.append(StringUtils.escapeForXML(getNode()));
buf.append("\"");
}
buf.append(">");
synchronized (items) {
for (Item item : items) {
buf.append(item.toXML());
}
}
buf.append("</query>");
return buf.toString();
}
/**
* An item is associated with an XMPP Entity, usually thought of a children of the parent
* entity and normally are addressable as a JID.<p>
*
* An item associated with an entity may not be addressable as a JID. In order to handle
* such items, Service Discovery uses an optional 'node' attribute that supplements the
* 'jid' attribute.
*/
public static class Item {
/**
* Request to create or update the item.
*/
public static final String UPDATE_ACTION = "update";
/**
* Request to remove the item.
*/
public static final String REMOVE_ACTION = "remove";
private String entityID;
private String name;
private String node;
private String action;
/**
* Create a new Item associated with a given entity.
*
* @param entityID the id of the entity that contains the item
*/
public Item(String entityID) {
this.entityID = entityID;
}
/**
* Returns the entity's ID.
*
* @return the entity's ID.
*/
public String getEntityID() {
return entityID;
}
/**
* Returns the entity's name.
*
* @return the entity's name.
*/
public String getName() {
return name;
}
/**
* Sets the entity's name.
*
* @param name the entity's name.
*/
public void setName(String name) {
this.name = name;
}
/**
* Returns the node attribute that supplements the 'jid' attribute. A node is merely
* something that is associated with a JID and for which the JID can provide information.<p>
*
* Node attributes SHOULD be used only when trying to provide or query information which
* is not directly addressable.
*
* @return the node attribute that supplements the 'jid' attribute
*/
public String getNode() {
return node;
}
/**
* Sets the node attribute that supplements the 'jid' attribute. A node is merely
* something that is associated with a JID and for which the JID can provide information.<p>
*
* Node attributes SHOULD be used only when trying to provide or query information which
* is not directly addressable.
*
* @param node the node attribute that supplements the 'jid' attribute
*/
public void setNode(String node) {
this.node = node;
}
/**
* Returns the action that specifies the action being taken for this item. Possible action
* values are: "update" and "remove". Update should either create a new entry if the node
* and jid combination does not already exist, or simply update an existing entry. If
* "remove" is used as the action, the item should be removed from persistent storage.
*
* @return the action being taken for this item
*/
public String getAction() {
return action;
}
/**
* Sets the action that specifies the action being taken for this item. Possible action
* values are: "update" and "remove". Update should either create a new entry if the node
* and jid combination does not already exist, or simply update an existing entry. If
* "remove" is used as the action, the item should be removed from persistent storage.
*
* @param action the action being taken for this item
*/
public void setAction(String action) {
this.action = action;
}
public String toXML() {
StringBuilder buf = new StringBuilder();
buf.append("<item jid=\"").append(entityID).append("\"");
if (name != null) {
buf.append(" name=\"").append(StringUtils.escapeForXML(name)).append("\"");
}
if (node != null) {
buf.append(" node=\"").append(StringUtils.escapeForXML(node)).append("\"");
}
if (action != null) {
buf.append(" action=\"").append(StringUtils.escapeForXML(action)).append("\"");
}
buf.append("/>");
return buf.toString();
}
}
}