1 /** 2 * $RCSfile$ 3 * $Revision: 7071 $ 4 * $Date: 2007-02-12 08:59:05 +0800 (Mon, 12 Feb 2007) $ 5 * 6 * Copyright 2003-2007 Jive Software. 7 * 8 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); 9 * you may not use this file except in compliance with the License. 10 * You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 21 package org.jivesoftware.smackx.packet; 22 23 import org.jivesoftware.smack.packet.IQ; 24 import org.jivesoftware.smack.util.StringUtils; 25 26 import java.util.Collection; 27 import java.util.Collections; 28 import java.util.Iterator; 29 import java.util.List; 30 import java.util.concurrent.CopyOnWriteArrayList; 31 32 /** 33 * A DiscoverItems IQ packet, which is used by XMPP clients to request and receive items 34 * associated with XMPP entities.<p> 35 * 36 * The items could also be queried in order to discover if they contain items inside. Some items 37 * may be addressable by its JID and others may require to be addressed by a JID and a node name. 38 * 39 * @author Gaston Dombiak 40 */ 41 public class DiscoverItems extends IQ { 42 43 public static final String NAMESPACE = "http://jabber.org/protocol/disco#items"; 44 45 private final List<Item> items = new CopyOnWriteArrayList<Item>(); 46 private String node; 47 48 /** 49 * Adds a new item to the discovered information. 50 * 51 * @param item the discovered entity's item 52 */ 53 public void addItem(Item item) { 54 synchronized (items) { 55 items.add(item); 56 } 57 } 58 59 /** 60 * Adds a collection of items to the discovered information. Does nothing if itemsToAdd is null 61 * 62 * @param itemsToAdd 63 */ 64 public void addItems(Collection<Item> itemsToAdd) { 65 if (itemsToAdd == null) return; 66 for (Item i : itemsToAdd) { 67 addItem(i); 68 } 69 } 70 71 /** 72 * Returns the discovered items of the queried XMPP entity. 73 * 74 * @return an Iterator on the discovered entity's items 75 */ 76 public Iterator<DiscoverItems.Item> getItems() { 77 synchronized (items) { 78 return Collections.unmodifiableList(items).iterator(); 79 } 80 } 81 82 /** 83 * Returns the node attribute that supplements the 'jid' attribute. A node is merely 84 * something that is associated with a JID and for which the JID can provide information.<p> 85 * 86 * Node attributes SHOULD be used only when trying to provide or query information which 87 * is not directly addressable. 88 * 89 * @return the node attribute that supplements the 'jid' attribute 90 */ 91 public String getNode() { 92 return node; 93 } 94 95 /** 96 * Sets the node attribute that supplements the 'jid' attribute. A node is merely 97 * something that is associated with a JID and for which the JID can provide information.<p> 98 * 99 * Node attributes SHOULD be used only when trying to provide or query information which 100 * is not directly addressable. 101 * 102 * @param node the node attribute that supplements the 'jid' attribute 103 */ 104 public void setNode(String node) { 105 this.node = node; 106 } 107 108 public String getChildElementXML() { 109 StringBuilder buf = new StringBuilder(); 110 buf.append("<query xmlns=\"" + NAMESPACE + "\""); 111 if (getNode() != null) { 112 buf.append(" node=\""); 113 buf.append(StringUtils.escapeForXML(getNode())); 114 buf.append("\""); 115 } 116 buf.append(">"); 117 synchronized (items) { 118 for (Item item : items) { 119 buf.append(item.toXML()); 120 } 121 } 122 buf.append("</query>"); 123 return buf.toString(); 124 } 125 126 /** 127 * An item is associated with an XMPP Entity, usually thought of a children of the parent 128 * entity and normally are addressable as a JID.<p> 129 * 130 * An item associated with an entity may not be addressable as a JID. In order to handle 131 * such items, Service Discovery uses an optional 'node' attribute that supplements the 132 * 'jid' attribute. 133 */ 134 public static class Item { 135 136 /** 137 * Request to create or update the item. 138 */ 139 public static final String UPDATE_ACTION = "update"; 140 141 /** 142 * Request to remove the item. 143 */ 144 public static final String REMOVE_ACTION = "remove"; 145 146 private String entityID; 147 private String name; 148 private String node; 149 private String action; 150 151 /** 152 * Create a new Item associated with a given entity. 153 * 154 * @param entityID the id of the entity that contains the item 155 */ 156 public Item(String entityID) { 157 this.entityID = entityID; 158 } 159 160 /** 161 * Returns the entity's ID. 162 * 163 * @return the entity's ID. 164 */ 165 public String getEntityID() { 166 return entityID; 167 } 168 169 /** 170 * Returns the entity's name. 171 * 172 * @return the entity's name. 173 */ 174 public String getName() { 175 return name; 176 } 177 178 /** 179 * Sets the entity's name. 180 * 181 * @param name the entity's name. 182 */ 183 public void setName(String name) { 184 this.name = name; 185 } 186 187 /** 188 * Returns the node attribute that supplements the 'jid' attribute. A node is merely 189 * something that is associated with a JID and for which the JID can provide information.<p> 190 * 191 * Node attributes SHOULD be used only when trying to provide or query information which 192 * is not directly addressable. 193 * 194 * @return the node attribute that supplements the 'jid' attribute 195 */ 196 public String getNode() { 197 return node; 198 } 199 200 /** 201 * Sets the node attribute that supplements the 'jid' attribute. A node is merely 202 * something that is associated with a JID and for which the JID can provide information.<p> 203 * 204 * Node attributes SHOULD be used only when trying to provide or query information which 205 * is not directly addressable. 206 * 207 * @param node the node attribute that supplements the 'jid' attribute 208 */ 209 public void setNode(String node) { 210 this.node = node; 211 } 212 213 /** 214 * Returns the action that specifies the action being taken for this item. Possible action 215 * values are: "update" and "remove". Update should either create a new entry if the node 216 * and jid combination does not already exist, or simply update an existing entry. If 217 * "remove" is used as the action, the item should be removed from persistent storage. 218 * 219 * @return the action being taken for this item 220 */ 221 public String getAction() { 222 return action; 223 } 224 225 /** 226 * Sets the action that specifies the action being taken for this item. Possible action 227 * values are: "update" and "remove". Update should either create a new entry if the node 228 * and jid combination does not already exist, or simply update an existing entry. If 229 * "remove" is used as the action, the item should be removed from persistent storage. 230 * 231 * @param action the action being taken for this item 232 */ 233 public void setAction(String action) { 234 this.action = action; 235 } 236 237 public String toXML() { 238 StringBuilder buf = new StringBuilder(); 239 buf.append("<item jid=\"").append(entityID).append("\""); 240 if (name != null) { 241 buf.append(" name=\"").append(StringUtils.escapeForXML(name)).append("\""); 242 } 243 if (node != null) { 244 buf.append(" node=\"").append(StringUtils.escapeForXML(node)).append("\""); 245 } 246 if (action != null) { 247 buf.append(" action=\"").append(StringUtils.escapeForXML(action)).append("\""); 248 } 249 buf.append("/>"); 250 return buf.toString(); 251 } 252 } 253 } 254
