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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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/**
 * 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.provider;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smack.provider.PacketExtensionProvider;
import org.jivesoftware.smack.util.PacketParserUtils;
import org.jivesoftware.smackx.pubsub.provider.ItemProvider;
import org.jivesoftware.smackx.pubsub.provider.ItemsProvider;
import org.xmlpull.v1.XmlPullParser;

/**
 * 
 * This class simplifies parsing of embedded elements by using the 
 * Template Method Pattern.  
 * After extracting the current element attributes and content of any child elements, the template method 
 * ({@link #createReturnExtension(String, String, Map, List)} is called.  Subclasses
 * then override this method to create the specific return type.
 * 
 * 

To use this class, you simply register your subclasses as extension providers in the * smack.properties file. Then they will be automatically picked up and used to parse * any child elements. * *

 * For example, given the following message
 * 
 * <message from='pubsub.shakespeare.lit' to='[email protected]' id='foo>
 *    <event xmlns='http://jabber.org/protocol/pubsub#event>
 *       <items node='princely_musings'>
 *          <item id='asdjkwei3i34234n356'>
 *             <entry xmlns='http://www.w3.org/2005/Atom'>
 *                <title>Soliloquy</title>
 *                <link rel='alternative' type='text/html'/>
 *                <id>tag:denmark.lit,2003:entry-32397</id>
 *             </entry>
 *          </item>
 *       </items>
 *    </event>
 * </message>
 * 
 * I would have a classes
 * {@link ItemsProvider} extends {@link EmbeddedExtensionProvider}
 * {@link ItemProvider} extends {@link EmbeddedExtensionProvider}
 * and
 * AtomProvider extends {@link PacketExtensionProvider}
 * 
 * These classes are then registered in the meta-inf/smack.providers file
 * as follows.
 * 
 *   <extensionProvider>
 *      <elementName>items</elementName>
 *      <namespace>http://jabber.org/protocol/pubsub#event</namespace>
 *      <className>org.jivesoftware.smackx.provider.ItemsEventProvider</className>
 *   </extensionProvider>
 *   <extensionProvider>
 *       <elementName>item</elementName>
 *       <namespace>http://jabber.org/protocol/pubsub#event</namespace>
 *       <className>org.jivesoftware.smackx.provider.ItemProvider</className>
 *   </extensionProvider>
 * 
 * 
* * @author Robin Collier */ abstract public class EmbeddedExtensionProvider implements PacketExtensionProvider { final public PacketExtension parseExtension(XmlPullParser parser) throws Exception { String namespace = parser.getNamespace(); String name = parser.getName(); Map attMap = new HashMap(); for(int i=0; i extensions = new ArrayList(); do { int tag = parser.next(); if (tag == XmlPullParser.START_TAG) extensions.add(PacketParserUtils.parsePacketExtension(parser.getName(), parser.getNamespace(), parser)); } while (!name.equals(parser.getName())); return createReturnExtension(name, namespace, attMap, extensions); } abstract protected PacketExtension createReturnExtension(String currentElement, String currentNamespace, Map attributeMap, List content); }




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