org.jivesoftware.smackx.pubsub.EmbeddedPacketExtension Maven / Gradle / Ivy

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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.pubsub;

import java.util.List;

import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smack.util.PacketParserUtils;

/**
 * This interface defines {@link PacketExtension} implementations that contain other
 * extensions.  This effectively extends the idea of an extension within one of the 
 * top level {@link Packet} types to consider any embedded element to be an extension
 * of its parent.  This more easily enables the usage of some of Smacks parsing
 * utilities such as {@link PacketParserUtils#parsePacketExtension(String, String, org.xmlpull.v1.XmlPullParser)} to be used
 * to parse any element of the XML being parsed.
 * 
 * Top level extensions have only one element, but they can have multiple children, or
 * their children can have multiple children.  This interface is a way of allowing extensions 
 * to be embedded within one another as a partial or complete one to one mapping of extension 
 * to element.
 * 
 * @author Robin Collier
 */
public interface EmbeddedPacketExtension extends PacketExtension
{
	/**
	 * Get the list of embedded {@link PacketExtension} objects.
	 *  
	 * @return List of embedded {@link PacketExtension}
	 */
	List getExtensions();
}