org.jivesoftware.smackx.pubsub.SubscriptionsExtension 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.Collections;
import java.util.List;

/**
 * Represents the element holding the list of subscription elements.
 * 
 * @author Robin Collier
 */
public class SubscriptionsExtension extends NodeExtension
{
	protected List items = Collections.EMPTY_LIST;
	
	/**
	 * Subscriptions to the root node
	 * 
	 * @param subList The list of subscriptions
	 */
	public SubscriptionsExtension(List subList)
	{
		super(PubSubElementType.SUBSCRIPTIONS);
		
		if (subList != null)
			items = subList;
	}

	/**
	 * Subscriptions to the specified node.
	 * 
	 * @param nodeId The node subscribed to
	 * @param subList The list of subscriptions
	 */
	public SubscriptionsExtension(String nodeId, List subList)
	{
		super(PubSubElementType.SUBSCRIPTIONS, nodeId);

		if (subList != null)
			items = subList;
	}

	/**
	 * Gets the list of subscriptions.
	 * 
	 * @return List of subscriptions
	 */
	public List getSubscriptions()
	{
		return items;
	}

	@Override
	public String toXML()
	{
		if ((items == null) || (items.size() == 0))
		{
			return super.toXML();
		}
		else
		{
			StringBuilder builder = new StringBuilder("<");
			builder.append(getElementName());
			
			if (getNode() != null)
			{
				builder.append(" node='");
				builder.append(getNode());
				builder.append("'");
			}
			builder.append(">");
			
			for (Subscription item : items)
			{
				builder.append(item.toXML());
			}
			
			builder.append("");
			return builder.toString();
		}
	}
}